Geophysical investigations were carried out along two failed segments of Akure-Ijare road, named
locality 1 and locality 2, with the aim of establishing the cause(s) of the incessant pavement failure along the
road. The geophysical investigations involved the Very Low Frequency Electromagnetic (VLF-EM) and
Electrical Resistivity Methods. The VLF-EM measurements were taken at intervals of 10 m along traverses
parallel to road pavements. Two techniques were adopted for the electrical resistivity method namely: the
vertical electrical sounding (VES) and a combination of horizontal profiling and sounding using dipole-dipole
configuration with inter stations separation (a) of 5 m and an expansion factor (n) that varies from 1 to 5. The
Schlumberger configuration was used for the VES with AB/2 varying from 1 to 65 m. Nine (9) and twelve (12)
VES were carried out at localities 1 and 2 respectively. The VLF-EM method revealed that the road pavement is
founded on a weakly conductive material devoid of major geological structure. The Vertical electrical sounding
curves range from A, H to KH. The geoelectric sections generally identified three to four geologic sequences
that comprise topsoil, weathered layer, partly weathered/fracture basement and fresh basement. At locality 1,
the topsoil/subsoil on which the road is founded are of low resistivity generally less than 100 Ω-m composed of
clayey materials, while the road pavement along locality 2 is within the resistive topsoil or directly on bedrock.
The bedrock along this locality is generally shallow (< 2 m) with an uneven interface. Therefore, from the
results of the investigation the causes of road failure in the studied roadway are heterogeneity and clayey nature
of the topsoil/sub-grade material, lack of proper drainage at the road embankment and poor construction
material.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
This document discusses subsurface mapping techniques in Pakistan. It provides details on the different types of subsurface maps including contour maps, geological cross sections, isopach maps, and isochore maps. It also describes some key subsurface features in Pakistan such as pre-Cambrian to recent rock formations, metallogenic zones, and mineral and coal deposits. The document outlines methods that can be used for subsurface mapping, including shallow seismic surveys, ground penetrating radar, electrical resistivity tomography, and very low frequency EM surveys.
Geo-electric Investigation of the Cause of Structural Failure Indices on a Se...iosrjce
Electrical resistivity imaging has been employed to investigate the causes of structural failure related
cracks on a set of administrative buildings in southwestern Nigeria. The goals were to determine the
distribution of subsurface geologic lithologies beneath the set of buildings and therefrom infer the relative
strengths of such lithologies. Data were collected along four geo-electric traverses using the ABEM1000
Terrameter unit. The dipole-dipole array was utilized with an electrode separation of 5 m. Observed field data
were processed and inverted using a 2.5D finite-element modeling inversion algorithm. Results indicate that the
northeastern half of the site is underlain by unweathered basement rocks overlain by thin (generally < 4 m) soil
cover, while the southwestern region is dominated at depths beyond 4 m by low-resistivity water-saturated clays
and some weathering tills. The clays apparently receive abundant supply of water from a seasonal stream
channel adjacent to the westerly administrative blocks. The block presenting with the most damage has been
built out over the edge of the shallow basement rocks onto these less competent water-saturated clays in the
southeastern region resulting in cantilever-style differential settling. A second damaged block is situated
entirely on low resistivity water-saturated clays. Differential settling on this block is likely related to the
difference in thicknesses of the clays between sites of the north and south facing walls of the structure. Beneath
the northern wall, the clays are thinner and could be expected to compress less than at the southern wall.
Though uncalibrated to core or log data, the results allowed a first insight into possible causes of structural
failure on the buildings and it is hoped that palliative measures will benefit from these results.
Geoelectrical assessment of a proposed dam site around ehuhe area of oji rive...Alexander Decker
This document summarizes a study that used geophysical methods to evaluate a proposed dam site near Ehuhe, Nigeria. Vertical electrical sounding (VES) was conducted along the proposed 477m dam axis and surrounding area using 12 stations spaced 40-60m apart. The data obtained from the VES were inverted to determine subsurface layer parameters down to depths of 35m. The results identified three lithologic units - loose dry sandstone at the top, underlain by hard but jointed iron oxide-cemented sandstone, and then porous sandstone. Resistivity values ranged from 9,200-66,100 ohm-m, 1,440-161,000 ohm-m, and 555-21,
- Vertical electrical sounding (VES) was used to map the groundwater potential of an industrial estate in Ogbomoso, Nigeria using 10 soundings.
- The soundings revealed 3-4 layer earth models consisting of topsoil, weathered/clay layers, fractured basement, and fresh basement.
- Maps of overburden thickness, weathered layer properties, and bedrock relief identified the southern and eastern parts as most promising for groundwater development, with the northeastern part considered fair.
Stratigraphic influence on geotechnical properties of subgrade soils along th...Alexander Decker
This document summarizes a study of the stratigraphic influence on geotechnical properties of subgrade soils along the Irrua-Auchi road in Nigeria. Laboratory and field tests were conducted to analyze the engineering properties of soils derived from different geologic formations underlying the road: the Ameki Formation, Imo Shale, and Ajali Sandstone. Results showed the soils had similar geotechnical properties but pavement deflections, indicating stability, varied with geology, with the most stable segment underlain by Ajali soils and the least stable by Imo shale soils. Stratification of underlying geologic units thus influenced the pavement performance.
The document summarizes an engineering geological study of support requirements for a diversion tunnel at the Boztepe dam site in eastern Turkey. Empirical, theoretical, and numerical methods were used to characterize the rock mass and determine support needs. Field studies found the site contained basalt and tuffite units. Laboratory testing provided mechanical properties of intact rock samples. Rock mass quality was evaluated using RMR, Q, and GSI classification systems. Support requirements were proposed and numerically analyzed using the finite element method. A combination of approaches was found to provide a more reliable design.
Delineation of Groundwater Potential Zones through Electrical Resistivity Par...iosrjce
This study motivated to determine electrical resistivity parameters of Osmania University campus
area which is underlain by granitic terrain. A total 103 Vertical Electrical Soundings were conducted with
maximum electrode spacing of 150m, the results reveals four subsurface geoelectrical layers, the top soil layer
of variable resisitivity value between 11.2 Ωm to 599 Ωm whose maximum thickness is 0.75 m to 8.46 m. The
highly weathered second layer resistivity value varing from 1.72 Ωm to 1800 Ωm, thickness is 0.12 m to 36.6m.
The third fractured layer indicated by resistivity value of 16.3 to 460 Ωm and thickness is 4.9 m to 87.4 m. The
groundwater potentials of the area are evalueted based on the Longitudinal Conductance (S), Transverse
Resistance (T), Coefficient of Electrical Anisotropy (λ), Resistivity for the Formation ( ), Reflection
Coefficient ( ) and Resistivity Contrast ( ), Locations where weathered layer thickness > 25 m and of a low
clay content as indicated by the resistivity range < 60 Ωm value is categorized to be the area of highs
groundwater potentials
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
This document discusses subsurface mapping techniques in Pakistan. It provides details on the different types of subsurface maps including contour maps, geological cross sections, isopach maps, and isochore maps. It also describes some key subsurface features in Pakistan such as pre-Cambrian to recent rock formations, metallogenic zones, and mineral and coal deposits. The document outlines methods that can be used for subsurface mapping, including shallow seismic surveys, ground penetrating radar, electrical resistivity tomography, and very low frequency EM surveys.
Geo-electric Investigation of the Cause of Structural Failure Indices on a Se...iosrjce
Electrical resistivity imaging has been employed to investigate the causes of structural failure related
cracks on a set of administrative buildings in southwestern Nigeria. The goals were to determine the
distribution of subsurface geologic lithologies beneath the set of buildings and therefrom infer the relative
strengths of such lithologies. Data were collected along four geo-electric traverses using the ABEM1000
Terrameter unit. The dipole-dipole array was utilized with an electrode separation of 5 m. Observed field data
were processed and inverted using a 2.5D finite-element modeling inversion algorithm. Results indicate that the
northeastern half of the site is underlain by unweathered basement rocks overlain by thin (generally < 4 m) soil
cover, while the southwestern region is dominated at depths beyond 4 m by low-resistivity water-saturated clays
and some weathering tills. The clays apparently receive abundant supply of water from a seasonal stream
channel adjacent to the westerly administrative blocks. The block presenting with the most damage has been
built out over the edge of the shallow basement rocks onto these less competent water-saturated clays in the
southeastern region resulting in cantilever-style differential settling. A second damaged block is situated
entirely on low resistivity water-saturated clays. Differential settling on this block is likely related to the
difference in thicknesses of the clays between sites of the north and south facing walls of the structure. Beneath
the northern wall, the clays are thinner and could be expected to compress less than at the southern wall.
Though uncalibrated to core or log data, the results allowed a first insight into possible causes of structural
failure on the buildings and it is hoped that palliative measures will benefit from these results.
Geoelectrical assessment of a proposed dam site around ehuhe area of oji rive...Alexander Decker
This document summarizes a study that used geophysical methods to evaluate a proposed dam site near Ehuhe, Nigeria. Vertical electrical sounding (VES) was conducted along the proposed 477m dam axis and surrounding area using 12 stations spaced 40-60m apart. The data obtained from the VES were inverted to determine subsurface layer parameters down to depths of 35m. The results identified three lithologic units - loose dry sandstone at the top, underlain by hard but jointed iron oxide-cemented sandstone, and then porous sandstone. Resistivity values ranged from 9,200-66,100 ohm-m, 1,440-161,000 ohm-m, and 555-21,
- Vertical electrical sounding (VES) was used to map the groundwater potential of an industrial estate in Ogbomoso, Nigeria using 10 soundings.
- The soundings revealed 3-4 layer earth models consisting of topsoil, weathered/clay layers, fractured basement, and fresh basement.
- Maps of overburden thickness, weathered layer properties, and bedrock relief identified the southern and eastern parts as most promising for groundwater development, with the northeastern part considered fair.
Stratigraphic influence on geotechnical properties of subgrade soils along th...Alexander Decker
This document summarizes a study of the stratigraphic influence on geotechnical properties of subgrade soils along the Irrua-Auchi road in Nigeria. Laboratory and field tests were conducted to analyze the engineering properties of soils derived from different geologic formations underlying the road: the Ameki Formation, Imo Shale, and Ajali Sandstone. Results showed the soils had similar geotechnical properties but pavement deflections, indicating stability, varied with geology, with the most stable segment underlain by Ajali soils and the least stable by Imo shale soils. Stratification of underlying geologic units thus influenced the pavement performance.
The document summarizes an engineering geological study of support requirements for a diversion tunnel at the Boztepe dam site in eastern Turkey. Empirical, theoretical, and numerical methods were used to characterize the rock mass and determine support needs. Field studies found the site contained basalt and tuffite units. Laboratory testing provided mechanical properties of intact rock samples. Rock mass quality was evaluated using RMR, Q, and GSI classification systems. Support requirements were proposed and numerically analyzed using the finite element method. A combination of approaches was found to provide a more reliable design.
Delineation of Groundwater Potential Zones through Electrical Resistivity Par...iosrjce
This study motivated to determine electrical resistivity parameters of Osmania University campus
area which is underlain by granitic terrain. A total 103 Vertical Electrical Soundings were conducted with
maximum electrode spacing of 150m, the results reveals four subsurface geoelectrical layers, the top soil layer
of variable resisitivity value between 11.2 Ωm to 599 Ωm whose maximum thickness is 0.75 m to 8.46 m. The
highly weathered second layer resistivity value varing from 1.72 Ωm to 1800 Ωm, thickness is 0.12 m to 36.6m.
The third fractured layer indicated by resistivity value of 16.3 to 460 Ωm and thickness is 4.9 m to 87.4 m. The
groundwater potentials of the area are evalueted based on the Longitudinal Conductance (S), Transverse
Resistance (T), Coefficient of Electrical Anisotropy (λ), Resistivity for the Formation ( ), Reflection
Coefficient ( ) and Resistivity Contrast ( ), Locations where weathered layer thickness > 25 m and of a low
clay content as indicated by the resistivity range < 60 Ωm value is categorized to be the area of highs
groundwater potentials
Application of Geophysical and Remote Sensing Techniques to Delineate Laterit...Premier Publishers
This study used geophysical and remote sensing techniques to map lateritic bauxite deposits in Orin Ekiti, Nigeria. Landsat and SRTM data were used to delineate features indicating bauxite formation like topography, vegetation and rock types. Aeromagnetic data identified three main rock types - magmatite, granite gneiss and charnockite, with low magnetic susceptibility values in charnockite areas potentially indicating bauxite. Electrical resistivity imaging along five traverses found high resistivity zones between 600-101404 ohm-meters within 0-15 meters depth, likely representing bauxite zones. The techniques showed bauxite deposits are surficial or near-surface occurrences, helping to
Searching Ground Water Sources by Geoelectric Method for Tourism Developmenti...IJAEMSJORNAL
Taman Harmoni Bali Bukit Asah (THB-BA) is place located in Bugbug Village, KarangasemRegency, BaliProvince. Geographically located at 8,50057480 S, 115,60045930E. This tourism place has a beach, the name is Bias Putihbeach, people call it Virgin beach. The visitor from month to month continue to increase. This place also has a camp with an axotic view. Even though this exotic destination is so exotic, it still has weaknesses, namely the lack of water availability. While this is still riding in a local water supply group, so the water is still very far from enough, especially for camping, visitors in general, and plant maintenance. For this reason, it is necessary to find a solution so that the Taman Harmoni Bali Bukit Asah (THB-BA) can grow rapidly. One method that is often used to find groundwater sources is the geoelectric method. Research on the search for groundwater sources in THB-BA has been carried out from March 2018 to July 2018. The geological state of the study area is mostly in the form of rocky aluviun soils, which makes it difficult for site selection. Based on the surface geological conditions, a survey was carried out near the Bias Putih beach. A good source of water was found at a depth of 22 m. Later drilling, water was found starting at a depth of 9.5 m. Then drilling continues to a depth of 31 m with a screen starting at a depth of 23 m because the position of good water is estimated at a depth of 22 m. The existence of this water has also been tested, it turns out that it is true that there is water.
Subsurface Models of Abitumen-Rich Area near Ode-Irele, Southwestern Nigeria.iosrjce
Subsurface geophysical investigation around Looda village, near Ode-Irele was carried out with the
principal objective of evaluating the depth to the bituminous sand and its thickness with a view to suggesting
better environmentally compatible exploitation technique.Electrical resistivity survey using the Schlumberger
array was employed to generate subsurface models. 13 VES points along three (3) traverses were established in
the study area with manual curve matching followed by Computer iteration of the vertical electrical sounding
(VES) data. A careful study of the results, together with the knowledge of the Stratigraphy of the area was used
to develop the subsurface models.Two distinct models were generated. The first model generated is
characterised by a thin top soil (less than 1m thick) comprising the overburden underlain by dry sand (1.0m -
4.6m thick) which overlies bituminous sand horizon (6m -19m thick). This horizon is underlain by sandy silty
clay. The second model generated is defined by top soil (0.5m -1.8m thick) underlain by bituminous sand
horizon (2.5m -14.8m thick) which overlies saturated sand (1.9-11.3m thick). A fairly impervious sandy silty
clay layer underlies this aquifer.Huge deposit of heavy oil sand with thickness ranging from about 2.5m to
19.0m was observed between a depth of about 0.5m and 5.4m in the study area. This depth is relatively shallow
andcan be exploited preferably by open cast mining. However, precaution must be taken to prevent burst out
and contamination of the aquifer sandwiched between the bituminous sand and sandy clay horizons in some
locations during exploitation.
Application of Electrical Resistivity Tomography for Soil Competence Study in...IIJSRJournal
This study was carried out to determine soil competence around University of Benin Teaching Hospital and its environs using electrical resistivity tomography method. The Wenner Schlumberger Array Profiling method was used to give information of the subsurface resistivity. The result of the study showed that in ERT 1, highly competent soil were observed with resistivity values between 725Ωm and greater than 6546Ωm, which means that the area is underlain by clay sand at the top and sand/laterite/bedrock at the bottom. ERT 2 is characterized by highly competent soils with high resistivity values between 899Ωm to greater than 7851 Ωm, which indicates that the soil is underlain by sand/laterite/bedrocks. Furthermore, ERT 3 is group as highly competent soils, with resistivity values between762Ωm and greater than 6980 Ωm; this shows that the profile 3 is underlain by sand/laterite/bed rock. The study shows that though most part of the area contains soils that are competent, because of the presence of clay which on most occasion in the Niger Delta are expandable, detailed Geophysical and Civil engineering studies should be carried out before the erection of high rising engineering structures such as network masts, buildings and water tanks within the study area.
This study was carried out to determine the subsurface lithology and possible depths for structural foundations in Ignatius Ajuru University of Education, Port Harcourt in southern Nigeria using electrical resistivity techniques of VES and borehole logging. Model ABEM SAS 300B Terrameter aided by SAS 200 log meter were used for the data collection while version IPWIN2 software was used for the processing of the VES data. Six profiles of different locations, using maximum current electrode spread of 200 m and maximum potential electrode spread of 30 m, were used to obtain resistivity range of 1.2 to 4335 Ωm for three to four geoelectric sections covering depth interval of 19.8 m in the area. The borehole data covered a depth range of 0 to 20 m. The results show lithostratigraphy sequence of silty sands, laterite, grain and coarse sands with resistivity values of 721 to 4000 Ωm. These soils can support structures with foundations as close as 0.5 m to 3 m or more below the earth surface because laterite and sandy soils have the ability of a firm grasp of structural foundations as they do not retain moisture that will cause foundational deformation and shifting that may eventually lead to collapse of the structures.
Integrated Geophysical and Geotechnical Evaluation of Foundation Failure in P...inventionjournals
Geophysical and geotechnical methods have been integrated with the aim of assessing characteristics of sub-surface layers to identify why structures in some parts of Ikere-Ekiti Southwestern Nigeria are failing or sinking as a result of foundation failure. Eight (8) vertical electrical sounding (VES) were carried out using resistivity meter and six (6) pits were dug to a depth of 1.2m. Six disturbed soil samples were collected from the six dug pits for the study. These samples were subjected to geotechnical tests in the laboratory, which include moisture content, shear test, Atterberg limit and grain size analysis. The acquired VES data were processed and interpreted using partial curve matching technique. The results of the all the mall the eight VES produced H curves. This curve type manifested three layers which are composed of sandy-clay, clayeysand/weathered basement and weathered basement/rock head. The depth o rockhead ranges from 12.1 to 43.2m. VES stations four and five have deeper depth to rock head (i.e. 21.3 to 43.2m) while other locations have lesser depth to rockhead (i.e.1 12.1m to 17.5m). The second layer has the lowest resistivity values meaning that it is somewhat conductive owing to clayey sand deposition and weathered area. Geotechnical test shows that the soils in the study area generally has high moisture content, low plasticity, and from grain size distribution, high concentrations of silt and clay. From the result, it is established that the layer in which the foundations are built upon are rated as poor to fairly competent. This might be as a result of poor drainage system characterised the study area which brought about the local deposition of the supposed subsoil. Therefore, high moisture content made the subsoil to lose its competency thereby causing the structures in the study area to subside
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Combined Geophysical And Geotechnical Techniques For Assessment Of Foundation...IRJESJOURNAL
Abstract: This study was carried out to assess the subsurface conditions around the school of technology complex in Lagos State Polytechnic, Ikorodu, using integrated geophysical and geotechnical techniques. The site lies within the Sedimentary terrain of southwestern Nigeria. Allied Ohmega Resistivity meter was used for data collection of 1-D and 2-D resistivitymeasurement while WinResist software and Dipro software were used for the processing respectively.The results of the vertical electrical sounding indicate that the depth to basement values ranges between 27.6 and 39.5m. The 2D resistivitysurvey has provided valuable information on the lateral and vertical variation of the layer competent for erecting foundation of engineering structures. The CPT probed an average depth of 4.8m and has identified material of very high shear strength associated with dense sand materials. The correlation of the three techniques used revealed similar soil layering consisting of topsoilsandy clay, coarse sand and sand.A mechanically stable coarse sand material was discovered as weathered layer which indicates high load bearing capacity suitable for foundation in the area and can support massive structures.
Interpretation of Structural Terrace of Sheets: 303, 304 and 305 using Geophy...IIJSRJournal
The study on interpretation of aeromagnetic data of parts of Bamenda Massif (sheet 303, 304, and 305) South-eastern Nigeria has been evaluated. The data sets used are digitized maps of aeromagnetic data. The study area was characterized into four distinct zones such as A, B, C and D. Zone A occur in the northern portion and it is characterized by linear anomaly of amplitude 66.2 - 98.5nT. Zone B and C primarily share the same structural grain connecting the southwest and southern portions of the study area where they are characterised with large ''bull eye'' and narrow shaped anomalies. Zone D occupies the western and central portions of the study area showing features of magnetic highs and lows due to sporadic intrusions. The analysis review lineament structures aligned in a NE-SW and NW-SE trends which is in similar pattern to the initial rifting of the southern Nigerian margin system. Zone A, B and C are bound by intrusives of igneous origin. However, the interconnectivity of the structural lineaments makes them stand out as pathways for mineralization. Thus, most of the lineaments are believed to be located at a depth range of <246.5m to 258.2m, 258.2m to 437m, 212.9m to >626.1m and 769.2m to 1039.7m within the subsurface rocks.
Subsurface Sedimentary Thickness and Structural types of Formations in Imo St...IIJSRJournal
Imo State is part of the Niger Delta of Nigeria that is blessed with a lot of natural resources. These have not been fully exploited and subsurface information of the region is needed to enhance the exploration of these resources. In this work airborne gravity data obtained from the Nigerian Geological Survey Agency has been interpreted to obtain information on the structural types, sedimentary thickness and hydrocarbon potentials of the state. These were archived by use of Oasis Montaj software. The residual gravity anomaly was first extracted from the field data with a polynomial operation and then enhanced by a high pass filter before gridding, modelling and depth estimation, using inverse and forward modelling and Euler deconvolution operation. The results reveal syncline and anticline structures with strike angles of varying degrees and strike-slip faults. The depth to evaluated anomalous bodies was between 4,001 m and 9,439 m, all located in the Ameki and Imo Formations which are composed of sandstones and shales. The structures and formations they occur are favorable environments for hydrocarbon habitation as is common in the Niger delta basin. The Euler depth estimates gave sedimentary thickness ranges of 113.5 m to 8,717 m and falls within basement depths in the Niger Delta
This document summarizes a geological and geotechnical engineering survey conducted at the Prabasi Palli area in Bangladesh to assess the feasibility of the site for building construction. 13 boreholes up to 20m depth and 2 up to 30m were drilled and tested. Four major soil layers were identified based on soil samples and Standard Penetration Test N-values. The site lies within the Dhaka-Gazipur terrace formed of Madhupur Clay Residuum. Based on the investigation, the authors recommended a foundation soil layer for the site while keeping foundation design out of scope.
Geophysical investigation into the cause(s) of structural failure within baco...Alexander Decker
Geophysical investigations using Very Low Frequency Electromagnetic (VLF-EM) and electrical resistivity methods were conducted around buildings at Bowen University that were experiencing structural failures like cracks. The VLF-EM data identified zones of suspected fractures, faults, and contacts. Resistivity data revealed 4 subsurface layers with the weathered layer beneath the buildings comprising clayey materials with low resistivity. This clayey weathered layer was found to be thicker than ideal for structural foundations, ranging from 1.8 to 10.2 meters thick. Seasonal swelling and shrinking of the thick clayey layer is believed to have caused ground movements and instability leading to cracks in the buildings. Future foundation investigations are recommended to identify geologic features and unsuitable
Spatial data integration andmapping of groundwater potential zones on precamb...IAEME Publication
Spatial data integration andmapping of groundwater potential zones on precambrian terrain of hassan district karnataka india using geomatics application
A STUDY OF GEO-ENGINEERING PROPERTIES OF RIVER-BORNE COARSE AGGREGATES OF RIV...IAEME Publication
An attempt has been made to study the geological and engineering properties of the riverborne coarse aggregates of river Pagladia, Baksa district, Assam for evaluating their suitability as road material. The investigation were carried out on both natural and crushed form of the coarse aggregates of the river from upstream to gradually downstream to see their probable property variations. The results of various geological and engineering test performed show that both the type
of aggregates are suitable as road material as per specification laid down by Indian Standard Institutions (Bureau of Indian Standard), Indian Roads Congress and Ministry of Surface Transport and various suggestions put forward by different authors in their different publications.
This study used electrical resistivity imaging, seismic refraction tomography, and azimuthal resistivity soundings to assess an active open dump site in Kaduna, Nigeria. The objectives were to delineate potential leachate plumes and subsurface pathways that could transport contaminants. Results from resistivity imaging identified low resistivity zones (6-33 ohm-m) representing leachate plumes. Resistivity and seismic models also delineated fractures beneath the weathered basement layer that could act as pathways. Longitudinal conductance values of 0.02-0.1 mhos indicated poor protective capacity, allowing leachate to reach shallow aquifers. Azimuthal resistivity soundings at 45 m depth
Engineering geophysical investigation around ungwan doka, shika area within t...Alexander Decker
The document summarizes an engineering geophysical investigation conducted around Ungwan Doka, Shika area in northwestern Nigeria. Vertical electrical soundings using Schlumberger configuration were performed at 18 locations. The resistivity data revealed 2-4 subsurface layers: a topsoil layer, a weathered basement layer, a partly weathered/fractured basement layer, and a fresh basement layer. Resistivity values and layer thicknesses varied across layers and locations. The study characterized the subsurface and evaluated its competence, structural variations, groundwater potential, and safety of the hydrogeologic system to inform engineering design.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
IRJET- Ajanta Caves: Past Present and FutureIRJET Journal
The document discusses the Ajanta Caves, a UNESCO World Heritage site located in Maharashtra, India that contains 30 rock-cut Buddhist cave monuments dating from the 2nd century BCE to 480CE. The caves contain fine examples of ancient Indian paintings and sculptures, but their basalt rock formation is deteriorating due to natural causes like weathering as well as human factors such as increased tourism. Several studies examined the rock stability and identified fractures that allow water seepage as major issues. Recommended solutions include using epoxy resin, rock bolting, barriers, and bentonite clay to stabilize boulders and control water flow in order to preserve the archaeological site.
Twelve vertical electrical soundings, VES, were carried out in parts of Abua in northwestern part of Rivers State in the sedimentary basin of the Niger delta of Nigeria, to determine the overburden layering and infer the aquifer depth/thickness and probable safe structural foundation depths in the region. The Schlumberger array method was employed using an ABEM 300B Terrameter and maximum current electrode spread of 400 m. The computed apparent resistivity field log values were plotted against the current electrode spreads and interpreted with IPWIN 2 and Sulphure 8 software to obtain the overburden thickness/depth, resistivity and the isopach map and then infer the subsoil layering thickness including potential aquifer zones within the depths of investigation in the area. The curve types revealed that three and four geoelectric sections were penetrated by the survey array with overburden thickness ranging from 4.2 m in Elok community to 91.7 m in Ilghom community. Potential aquifers with variable thickness from 5 to 60 m at depths of from 4.5 m and below the earth surface were identified. The subsurface soils types can support structural foundations from depths of 1.0 m and below the earth surface based on the type of building/engineering structures.
This document proposes research to determine the groundwater table in Hawa Galan catchment, Ethiopia using vertical electrical sounding (VES) methods. The study area has a population of over 123,000 people relying on groundwater sources like hand dug wells as there are no permanent surface water sources. Previous studies in the region focused on geology and igneous petrology but not groundwater. This research will involve collecting VES data along profiles and analyzing the results to map subsurface resistivity and identify potential high-yield aquifers and drilling locations to address the need for sustainable groundwater resources in the community. A detailed work plan and budget are provided outlining field work, data analysis, and reporting over an anticipated one year
Application of Geophysical and Remote Sensing Techniques to Delineate Laterit...Premier Publishers
This study used geophysical and remote sensing techniques to map lateritic bauxite deposits in Orin Ekiti, Nigeria. Landsat and SRTM data were used to delineate features indicating bauxite formation like topography, vegetation and rock types. Aeromagnetic data identified three main rock types - magmatite, granite gneiss and charnockite, with low magnetic susceptibility values in charnockite areas potentially indicating bauxite. Electrical resistivity imaging along five traverses found high resistivity zones between 600-101404 ohm-meters within 0-15 meters depth, likely representing bauxite zones. The techniques showed bauxite deposits are surficial or near-surface occurrences, helping to
Searching Ground Water Sources by Geoelectric Method for Tourism Developmenti...IJAEMSJORNAL
Taman Harmoni Bali Bukit Asah (THB-BA) is place located in Bugbug Village, KarangasemRegency, BaliProvince. Geographically located at 8,50057480 S, 115,60045930E. This tourism place has a beach, the name is Bias Putihbeach, people call it Virgin beach. The visitor from month to month continue to increase. This place also has a camp with an axotic view. Even though this exotic destination is so exotic, it still has weaknesses, namely the lack of water availability. While this is still riding in a local water supply group, so the water is still very far from enough, especially for camping, visitors in general, and plant maintenance. For this reason, it is necessary to find a solution so that the Taman Harmoni Bali Bukit Asah (THB-BA) can grow rapidly. One method that is often used to find groundwater sources is the geoelectric method. Research on the search for groundwater sources in THB-BA has been carried out from March 2018 to July 2018. The geological state of the study area is mostly in the form of rocky aluviun soils, which makes it difficult for site selection. Based on the surface geological conditions, a survey was carried out near the Bias Putih beach. A good source of water was found at a depth of 22 m. Later drilling, water was found starting at a depth of 9.5 m. Then drilling continues to a depth of 31 m with a screen starting at a depth of 23 m because the position of good water is estimated at a depth of 22 m. The existence of this water has also been tested, it turns out that it is true that there is water.
Subsurface Models of Abitumen-Rich Area near Ode-Irele, Southwestern Nigeria.iosrjce
Subsurface geophysical investigation around Looda village, near Ode-Irele was carried out with the
principal objective of evaluating the depth to the bituminous sand and its thickness with a view to suggesting
better environmentally compatible exploitation technique.Electrical resistivity survey using the Schlumberger
array was employed to generate subsurface models. 13 VES points along three (3) traverses were established in
the study area with manual curve matching followed by Computer iteration of the vertical electrical sounding
(VES) data. A careful study of the results, together with the knowledge of the Stratigraphy of the area was used
to develop the subsurface models.Two distinct models were generated. The first model generated is
characterised by a thin top soil (less than 1m thick) comprising the overburden underlain by dry sand (1.0m -
4.6m thick) which overlies bituminous sand horizon (6m -19m thick). This horizon is underlain by sandy silty
clay. The second model generated is defined by top soil (0.5m -1.8m thick) underlain by bituminous sand
horizon (2.5m -14.8m thick) which overlies saturated sand (1.9-11.3m thick). A fairly impervious sandy silty
clay layer underlies this aquifer.Huge deposit of heavy oil sand with thickness ranging from about 2.5m to
19.0m was observed between a depth of about 0.5m and 5.4m in the study area. This depth is relatively shallow
andcan be exploited preferably by open cast mining. However, precaution must be taken to prevent burst out
and contamination of the aquifer sandwiched between the bituminous sand and sandy clay horizons in some
locations during exploitation.
Application of Electrical Resistivity Tomography for Soil Competence Study in...IIJSRJournal
This study was carried out to determine soil competence around University of Benin Teaching Hospital and its environs using electrical resistivity tomography method. The Wenner Schlumberger Array Profiling method was used to give information of the subsurface resistivity. The result of the study showed that in ERT 1, highly competent soil were observed with resistivity values between 725Ωm and greater than 6546Ωm, which means that the area is underlain by clay sand at the top and sand/laterite/bedrock at the bottom. ERT 2 is characterized by highly competent soils with high resistivity values between 899Ωm to greater than 7851 Ωm, which indicates that the soil is underlain by sand/laterite/bedrocks. Furthermore, ERT 3 is group as highly competent soils, with resistivity values between762Ωm and greater than 6980 Ωm; this shows that the profile 3 is underlain by sand/laterite/bed rock. The study shows that though most part of the area contains soils that are competent, because of the presence of clay which on most occasion in the Niger Delta are expandable, detailed Geophysical and Civil engineering studies should be carried out before the erection of high rising engineering structures such as network masts, buildings and water tanks within the study area.
This study was carried out to determine the subsurface lithology and possible depths for structural foundations in Ignatius Ajuru University of Education, Port Harcourt in southern Nigeria using electrical resistivity techniques of VES and borehole logging. Model ABEM SAS 300B Terrameter aided by SAS 200 log meter were used for the data collection while version IPWIN2 software was used for the processing of the VES data. Six profiles of different locations, using maximum current electrode spread of 200 m and maximum potential electrode spread of 30 m, were used to obtain resistivity range of 1.2 to 4335 Ωm for three to four geoelectric sections covering depth interval of 19.8 m in the area. The borehole data covered a depth range of 0 to 20 m. The results show lithostratigraphy sequence of silty sands, laterite, grain and coarse sands with resistivity values of 721 to 4000 Ωm. These soils can support structures with foundations as close as 0.5 m to 3 m or more below the earth surface because laterite and sandy soils have the ability of a firm grasp of structural foundations as they do not retain moisture that will cause foundational deformation and shifting that may eventually lead to collapse of the structures.
Integrated Geophysical and Geotechnical Evaluation of Foundation Failure in P...inventionjournals
Geophysical and geotechnical methods have been integrated with the aim of assessing characteristics of sub-surface layers to identify why structures in some parts of Ikere-Ekiti Southwestern Nigeria are failing or sinking as a result of foundation failure. Eight (8) vertical electrical sounding (VES) were carried out using resistivity meter and six (6) pits were dug to a depth of 1.2m. Six disturbed soil samples were collected from the six dug pits for the study. These samples were subjected to geotechnical tests in the laboratory, which include moisture content, shear test, Atterberg limit and grain size analysis. The acquired VES data were processed and interpreted using partial curve matching technique. The results of the all the mall the eight VES produced H curves. This curve type manifested three layers which are composed of sandy-clay, clayeysand/weathered basement and weathered basement/rock head. The depth o rockhead ranges from 12.1 to 43.2m. VES stations four and five have deeper depth to rock head (i.e. 21.3 to 43.2m) while other locations have lesser depth to rockhead (i.e.1 12.1m to 17.5m). The second layer has the lowest resistivity values meaning that it is somewhat conductive owing to clayey sand deposition and weathered area. Geotechnical test shows that the soils in the study area generally has high moisture content, low plasticity, and from grain size distribution, high concentrations of silt and clay. From the result, it is established that the layer in which the foundations are built upon are rated as poor to fairly competent. This might be as a result of poor drainage system characterised the study area which brought about the local deposition of the supposed subsoil. Therefore, high moisture content made the subsoil to lose its competency thereby causing the structures in the study area to subside
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Combined Geophysical And Geotechnical Techniques For Assessment Of Foundation...IRJESJOURNAL
Abstract: This study was carried out to assess the subsurface conditions around the school of technology complex in Lagos State Polytechnic, Ikorodu, using integrated geophysical and geotechnical techniques. The site lies within the Sedimentary terrain of southwestern Nigeria. Allied Ohmega Resistivity meter was used for data collection of 1-D and 2-D resistivitymeasurement while WinResist software and Dipro software were used for the processing respectively.The results of the vertical electrical sounding indicate that the depth to basement values ranges between 27.6 and 39.5m. The 2D resistivitysurvey has provided valuable information on the lateral and vertical variation of the layer competent for erecting foundation of engineering structures. The CPT probed an average depth of 4.8m and has identified material of very high shear strength associated with dense sand materials. The correlation of the three techniques used revealed similar soil layering consisting of topsoilsandy clay, coarse sand and sand.A mechanically stable coarse sand material was discovered as weathered layer which indicates high load bearing capacity suitable for foundation in the area and can support massive structures.
Interpretation of Structural Terrace of Sheets: 303, 304 and 305 using Geophy...IIJSRJournal
The study on interpretation of aeromagnetic data of parts of Bamenda Massif (sheet 303, 304, and 305) South-eastern Nigeria has been evaluated. The data sets used are digitized maps of aeromagnetic data. The study area was characterized into four distinct zones such as A, B, C and D. Zone A occur in the northern portion and it is characterized by linear anomaly of amplitude 66.2 - 98.5nT. Zone B and C primarily share the same structural grain connecting the southwest and southern portions of the study area where they are characterised with large ''bull eye'' and narrow shaped anomalies. Zone D occupies the western and central portions of the study area showing features of magnetic highs and lows due to sporadic intrusions. The analysis review lineament structures aligned in a NE-SW and NW-SE trends which is in similar pattern to the initial rifting of the southern Nigerian margin system. Zone A, B and C are bound by intrusives of igneous origin. However, the interconnectivity of the structural lineaments makes them stand out as pathways for mineralization. Thus, most of the lineaments are believed to be located at a depth range of <246.5m to 258.2m, 258.2m to 437m, 212.9m to >626.1m and 769.2m to 1039.7m within the subsurface rocks.
Subsurface Sedimentary Thickness and Structural types of Formations in Imo St...IIJSRJournal
Imo State is part of the Niger Delta of Nigeria that is blessed with a lot of natural resources. These have not been fully exploited and subsurface information of the region is needed to enhance the exploration of these resources. In this work airborne gravity data obtained from the Nigerian Geological Survey Agency has been interpreted to obtain information on the structural types, sedimentary thickness and hydrocarbon potentials of the state. These were archived by use of Oasis Montaj software. The residual gravity anomaly was first extracted from the field data with a polynomial operation and then enhanced by a high pass filter before gridding, modelling and depth estimation, using inverse and forward modelling and Euler deconvolution operation. The results reveal syncline and anticline structures with strike angles of varying degrees and strike-slip faults. The depth to evaluated anomalous bodies was between 4,001 m and 9,439 m, all located in the Ameki and Imo Formations which are composed of sandstones and shales. The structures and formations they occur are favorable environments for hydrocarbon habitation as is common in the Niger delta basin. The Euler depth estimates gave sedimentary thickness ranges of 113.5 m to 8,717 m and falls within basement depths in the Niger Delta
This document summarizes a geological and geotechnical engineering survey conducted at the Prabasi Palli area in Bangladesh to assess the feasibility of the site for building construction. 13 boreholes up to 20m depth and 2 up to 30m were drilled and tested. Four major soil layers were identified based on soil samples and Standard Penetration Test N-values. The site lies within the Dhaka-Gazipur terrace formed of Madhupur Clay Residuum. Based on the investigation, the authors recommended a foundation soil layer for the site while keeping foundation design out of scope.
Geophysical investigation into the cause(s) of structural failure within baco...Alexander Decker
Geophysical investigations using Very Low Frequency Electromagnetic (VLF-EM) and electrical resistivity methods were conducted around buildings at Bowen University that were experiencing structural failures like cracks. The VLF-EM data identified zones of suspected fractures, faults, and contacts. Resistivity data revealed 4 subsurface layers with the weathered layer beneath the buildings comprising clayey materials with low resistivity. This clayey weathered layer was found to be thicker than ideal for structural foundations, ranging from 1.8 to 10.2 meters thick. Seasonal swelling and shrinking of the thick clayey layer is believed to have caused ground movements and instability leading to cracks in the buildings. Future foundation investigations are recommended to identify geologic features and unsuitable
Spatial data integration andmapping of groundwater potential zones on precamb...IAEME Publication
Spatial data integration andmapping of groundwater potential zones on precambrian terrain of hassan district karnataka india using geomatics application
A STUDY OF GEO-ENGINEERING PROPERTIES OF RIVER-BORNE COARSE AGGREGATES OF RIV...IAEME Publication
An attempt has been made to study the geological and engineering properties of the riverborne coarse aggregates of river Pagladia, Baksa district, Assam for evaluating their suitability as road material. The investigation were carried out on both natural and crushed form of the coarse aggregates of the river from upstream to gradually downstream to see their probable property variations. The results of various geological and engineering test performed show that both the type
of aggregates are suitable as road material as per specification laid down by Indian Standard Institutions (Bureau of Indian Standard), Indian Roads Congress and Ministry of Surface Transport and various suggestions put forward by different authors in their different publications.
This study used electrical resistivity imaging, seismic refraction tomography, and azimuthal resistivity soundings to assess an active open dump site in Kaduna, Nigeria. The objectives were to delineate potential leachate plumes and subsurface pathways that could transport contaminants. Results from resistivity imaging identified low resistivity zones (6-33 ohm-m) representing leachate plumes. Resistivity and seismic models also delineated fractures beneath the weathered basement layer that could act as pathways. Longitudinal conductance values of 0.02-0.1 mhos indicated poor protective capacity, allowing leachate to reach shallow aquifers. Azimuthal resistivity soundings at 45 m depth
Engineering geophysical investigation around ungwan doka, shika area within t...Alexander Decker
The document summarizes an engineering geophysical investigation conducted around Ungwan Doka, Shika area in northwestern Nigeria. Vertical electrical soundings using Schlumberger configuration were performed at 18 locations. The resistivity data revealed 2-4 subsurface layers: a topsoil layer, a weathered basement layer, a partly weathered/fractured basement layer, and a fresh basement layer. Resistivity values and layer thicknesses varied across layers and locations. The study characterized the subsurface and evaluated its competence, structural variations, groundwater potential, and safety of the hydrogeologic system to inform engineering design.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
IRJET- Ajanta Caves: Past Present and FutureIRJET Journal
The document discusses the Ajanta Caves, a UNESCO World Heritage site located in Maharashtra, India that contains 30 rock-cut Buddhist cave monuments dating from the 2nd century BCE to 480CE. The caves contain fine examples of ancient Indian paintings and sculptures, but their basalt rock formation is deteriorating due to natural causes like weathering as well as human factors such as increased tourism. Several studies examined the rock stability and identified fractures that allow water seepage as major issues. Recommended solutions include using epoxy resin, rock bolting, barriers, and bentonite clay to stabilize boulders and control water flow in order to preserve the archaeological site.
Twelve vertical electrical soundings, VES, were carried out in parts of Abua in northwestern part of Rivers State in the sedimentary basin of the Niger delta of Nigeria, to determine the overburden layering and infer the aquifer depth/thickness and probable safe structural foundation depths in the region. The Schlumberger array method was employed using an ABEM 300B Terrameter and maximum current electrode spread of 400 m. The computed apparent resistivity field log values were plotted against the current electrode spreads and interpreted with IPWIN 2 and Sulphure 8 software to obtain the overburden thickness/depth, resistivity and the isopach map and then infer the subsoil layering thickness including potential aquifer zones within the depths of investigation in the area. The curve types revealed that three and four geoelectric sections were penetrated by the survey array with overburden thickness ranging from 4.2 m in Elok community to 91.7 m in Ilghom community. Potential aquifers with variable thickness from 5 to 60 m at depths of from 4.5 m and below the earth surface were identified. The subsurface soils types can support structural foundations from depths of 1.0 m and below the earth surface based on the type of building/engineering structures.
This document proposes research to determine the groundwater table in Hawa Galan catchment, Ethiopia using vertical electrical sounding (VES) methods. The study area has a population of over 123,000 people relying on groundwater sources like hand dug wells as there are no permanent surface water sources. Previous studies in the region focused on geology and igneous petrology but not groundwater. This research will involve collecting VES data along profiles and analyzing the results to map subsurface resistivity and identify potential high-yield aquifers and drilling locations to address the need for sustainable groundwater resources in the community. A detailed work plan and budget are provided outlining field work, data analysis, and reporting over an anticipated one year
Mapping of Aquifer Contamination Using Geoelectric Methods at a Municipal Sol...iosrjce
This document summarizes a study that used geoelectric methods to map aquifer contamination from a municipal solid waste disposal site in Warri, Nigeria. Fourteen vertical electrical soundings and two-dimensional resistivity imaging were conducted across the dumpsite area. The results identified four subsurface layers and revealed low resistivity zones beneath the dumpsite, indicating contamination from leachate. Hydrogeochemical analysis confirmed elevated levels of contaminants in groundwater, showing the aquifer is being impacted by the dumpsite. The study demonstrated that geoelectric methods can effectively map dumpsite-induced groundwater contamination.
Application of Very Low Frequency- Electromagnetic (VLF-EM) Method to Map Fra...theijes
Geophysical survey involving very low frequency electromagnetic technique was applied to investigate possible geologic features like fractured / conductive zones in Auchi and its environs in Edo state, Southwestern Nigeria. The study area is located within latitudes 7o 05’ N.to 7o 10’N. and longitudes 6 o 11’E to 6o 22’E The geologic Formations outcroping in the area are mainly Ajali and Nsukka. Three profiles were taken along the roads from Auchi to Igara, Auchi to Fugar and Auchi to Uloke using Abem Wadi Terrameter. Plots of the profiles were carried out using computer software (Excel) and contouring using Surfer 10 to delineate the fractured/conductive zones. The values range from 0.3 to 22.5 Siemens. Areas of low conductivity values indicate highly massive resistive rocks while Areas of high conductivity indicates the sedimentary terrain/ host rock or mineralized zones. The area is sparsely (few) fractured. Along profile A, two fractured zones were identified with conductivity values of 7.6 to16.8 Siemens between 100m(7.146oN,6.195oE) to 400m (7.150oN, 6.200oE) and 420m to 460m with conductivity value range of 11.0 to 22.5 Siemens. For profile B, one fractured zone was identified and a stretch of massive intrusive from 7.099oN and 7.102oN and 6.357oE to 6.364oE, with conductivity range of 0.9 – 5.2 Siemens at points 400m and 520m – 1000m. Profile C has identifiable fractured zones at 900m – 1100m with conductivity of (35 – 50) Siemens. The intrusive/ host rock conductivity values of (0.3 – 8.7) Siemens located at 380m to 880m 7.156oN and 6.308oE, 1100m to 2000m, 7.148oN and 6.3295oE. A total of five conductive zones were observed.
Geotechnical investigation of road failure along ilorin ajase –ipo road kwar...Alexander Decker
This document summarizes a study examining factors contributing to road failure along the Ilorin-Ajase-Ipo road in Kwara State, Nigeria. Soil samples were collected from five locations along the road that had experienced failure and were tested for engineering properties. The results showed that the foundation materials were predominantly sandy soils with high percentages of sand. Principal component analysis indicated that sandy soils contributed most to the variability in the study area. The overall results suggested that poor foundation materials containing high sand content and poor engineering construction affected the rate of failure along the road.
11.assessment of the vulnerability of water supply aquifers in parts of imo r...Alexander Decker
The document summarizes a study that assessed the vulnerability of water supply aquifers in parts of the Imo River Basin in southeastern Nigeria. Twenty-three locations were investigated to obtain data on parameters like depth to water table, recharge rate, aquifer and soil properties, topography, and hydraulic conductivity, which were used in the DRASTIC model to develop a groundwater vulnerability map. The map showed that areas within the Imo shale and Ameki Formations generally have moderate vulnerability to pollution, while some locations like Okwelle, Umuna, and Okwe showed low vulnerability, likely due to lower porosity in clay- and shale-underlain areas.
Electrical Resistivity Survey Forground Water At Eye Zheba Village, Off Bida ...iosrjce
The paper titled “Electrical Resistivity survey for ground water” at EL-HALAL Farms, covered an
area of about 10km2
, located at Eye Zheba village along Minna-Bida Road, located on latitude 60
.001
and 6
0
7
1
West and longitude 90
3
1
and 9.101 North. As a result of water problem in Bida and its environs, the people living
in this environment suffered a lot due to lack of portable drinking water and water for domestic use. A
Geophysical survey carried out, employed the schlumberger Array method in which current were sent beneath
the earth surfaces, this was done at various points and the data collected. The area revealed three lithological
formations in some places while in some place five. With the lowest resistivty found to be 6.85 Ωm and the
highest resistivity was 12,774.46 Ωm. The lithotogical formation includes the sandstones, clayey sandstones,
sandy clay and ferruginised sandstone. Since this is a sedimentary area drilling is expected to be deep down to a
depth of about 70-75m
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Research Inventy : International Journal of Engineering and Scienceinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
2D-Euler Deconvolution technique and Electrical Self-Potential analysis for s...iosrjce
In order to evaluate groundwater potential of Matuu-Kilango area faults and fractures which are
groundwater conduits had to be delineated. Earlier use of geological reconnaissance report only in siting
boreholes has led to recorded cases of borehole failure in Matuu. Integrated geophysical survey involving
magnetics and electrical self-potential techniques was applied over a 25 square kilometre area. Qualitative
interpretation involving generation of contour maps for magnetic anomaly as well as self-potentials was
attempted. Euler Deconvolution solutions were obtained using a structural index of 0.5 that gave well clustered
solutions and discontinuities over the anomalous zone. Fractured/faulted zone was identified to the west of
Matuu-Kilango area with faults and fractures existing at 100m depth having general orientation of South-East
to North-West. Along the faulted zone was prevalent negative self-potential values ranging from -10mV to about
-100mV, an indication of availability of groundwater resource
Groundwater investigation using geophysical methods a case study of pydibhim...eSAT Publishing House
This document summarizes the results of a geophysical investigation using vertical electrical sounding (VES) methods at 13 locations around an industrial area in India. The VES data was interpreted to generate geo-electric sections and pseudo-sections showing subsurface resistivity variations. Three main layers were typically identified - a high resistivity topsoil, a weathered middle layer, and a basement rock. Pseudo-sections revealed relatively more weathered areas in the northwest and southwest. Resistivity sections helped identify zones of possible high groundwater potential based on low resistivity anomalies sandwiched between more resistive layers. The study concluded the electrical resistivity method was useful for understanding subsurface geology and identifying areas prospective for groundwater exploration.
The study uses electromagnetic and vertical electrical sounding surveys to investigate the geology and hydrogeophysical features of the Abu Zabad area in Western Kordofan State, Sudan. The surveys identified two main aquifer formations from the Precambrian basement - the weathering formation and fractures formation. Interpretation of the survey data revealed four geo-electric layers but generally two distinct lithologic layers: a superficial deposit layer and a bedrock-basement layer. Aquifer thicknesses in the area range from 20 to 30 meters. The techniques were found to be suitable for identifying potential borehole locations in the basement rock region.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
The document summarizes the results of a geophysical investigation using vertical electrical soundings around Makiyaye village in Nigeria. 18 vertical electrical soundings were conducted and analyzed. The subsurface was found to consist of 4 main layers - a topsoil layer, a weathered basement layer, a partly weathered/fractured basement layer, and a fresh basement layer. Resistivity values and thicknesses of the layers varied across the study area. The geoelectric sections revealed dips and a synclinal structure in the subsurface. Based on the resistivity values, the subsurface material up to 20m depth was found to be competent with high load-bearing capacity, though some low resistivity zones indicated high clay content
The document summarizes the results of a geophysical investigation using vertical electrical soundings around Makiyaye village in Nigeria. 18 vertical electrical soundings were conducted and analyzed. The subsurface was found to consist of 4 main layers - a topsoil layer, a weathered basement layer, a partly weathered/fractured basement layer, and a fresh basement layer. Resistivity values and thicknesses of the layers varied across the study area. The geoelectric sections revealed dips and a synclinal structure in the subsurface. Based on the investigation, the subsurface material up to 20m depth was found to be competent for construction, while low resistivity zones indicated high clay content and saturation, requiring consideration in engineering
Safety is the primary and most important reason for monitoring the deformations of engineering structures. It could also help in improving our knowledge of the mechanical behaviour of engineering structures. Engineering structures are subject to deformation due to factors such as changes of ground water level, traffic load changes, tidal and tectonic phenomena. The Ikpoba River Bridge in Benin City whose traffic load has increased was monitored using GPS technology. The bridge was investigated as a result of carrying more load than usual due to the expansion of the road and dredging activities that had taken place in the river in 2008. One reference station and six monitoring points were involved in the monitoring of the bridge. The regularity of the survey was thirty days, and six observation epochs were used. Each monitoring point was occupied for about thirty minutes during the observation. The observation data were processed with compass software. The processed coordinates were adjusted with least squares adjustment technique. The standard deviation of unit weight for the weighted observations (σo) was computed for each observation epoch and was less than 1cm. The observation epochs were compared consecutively by finding the difference between successive observation results. The maximum differences in coordinates of the successive epochs were all less than 1mm. It was seen from the results that the bridge
was stable and did not undergo any displacement/movement within the period of study. It is recommended that the results of the six monitored points on the bridge should be further analyzed using other appropriate model of adjustment technique.
Geophysical Investigation for Groundwater Potential in Rufus Giwa Polytechnic...theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Application of electrical resistivity tomography (ert) and arial photographs ...Alexander Decker
1. The document describes a study using electrical resistivity tomography (ERT) and aerial photographs to identify karst features like sinkholes at three construction sites in Perak, Malaysia.
2. ERT surveys found anomalies indicating saturated clay and possible sinkholes at the first site, several sinkholes and clay zones at the second site, and multiple soil collapse sinkholes and clay zones at the third site.
3. The study aims to locate karst features, estimate bedrock depth, and characterize the features to inform construction planning and mitigate geohazards at the sites.
Similar to Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria (20)
An Examination of Effectuation Dimension as Financing Practice of Small and M...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Does Goods and Services Tax (GST) Leads to Indian Economic Development?iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Childhood Factors that influence success in later lifeiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Emotional Intelligence and Work Performance Relationship: A Study on Sales Pe...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Customer’s Acceptance of Internet Banking in Dubaiiosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
A Study of Employee Satisfaction relating to Job Security & Working Hours amo...iosrjce
IOSR Journal of Business and Management (IOSR-JBM) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of business and managemant and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications inbusiness and management. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
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Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
1. IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG)
e-ISSN: 2321–0990, p-ISSN: 2321–0982.Volume 3, Issue 6 Ver. II (Nov. - Dec. 2015), PP 45-54
www.iosrjournals.org
DOI: 10.9790/0990-03624554 www.iosrjournals.org 45 | Page
Geophysical Investigations of a Pavement Failure
Along Akure-Ijare Road, Southwestern Nigeria
O.O. Falowo¹, O.J. Akintorinwa²
¹ (Department of Civil Engineering, Faculty of Engineering Technology, Rufus Giwa Polytechnic,
Owo, Ondo State, Nigeria.)
²(Department of Applied Geophysics, School of Earth and Mineral Sciences,
Federal University of Technology Akure, Ondo State, Nigeria)
Abstract: Geophysical investigations were carried out along two failed segments of Akure-Ijare road, named
locality 1 and locality 2, with the aim of establishing the cause(s) of the incessant pavement failure along the
road. The geophysical investigations involved the Very Low Frequency Electromagnetic (VLF-EM) and
Electrical Resistivity Methods. The VLF-EM measurements were taken at intervals of 10 m along traverses
parallel to road pavements. Two techniques were adopted for the electrical resistivity method namely: the
vertical electrical sounding (VES) and a combination of horizontal profiling and sounding using dipole-dipole
configuration with inter stations separation (a) of 5 m and an expansion factor (n) that varies from 1 to 5. The
Schlumberger configuration was used for the VES with AB/2 varying from 1 to 65 m. Nine (9) and twelve (12)
VES were carried out at localities 1 and 2 respectively. The VLF-EM method revealed that the road pavement is
founded on a weakly conductive material devoid of major geological structure. The Vertical electrical sounding
curves range from A, H to KH. The geoelectric sections generally identified three to four geologic sequences
that comprise topsoil, weathered layer, partly weathered/fracture basement and fresh basement. At locality 1,
the topsoil/subsoil on which the road is founded are of low resistivity generally less than 100 Ω-m composed of
clayey materials, while the road pavement along locality 2 is within the resistive topsoil or directly on bedrock.
The bedrock along this locality is generally shallow (< 2 m) with an uneven interface. Therefore, from the
results of the investigation the causes of road failure in the studied roadway are heterogeneity and clayey nature
of the topsoil/sub-grade material, lack of proper drainage at the road embankment and poor construction
material.
Keywords: failed segment, geophysical investigation, geological sequence, road failure, southwestern Nigeria,
I. Introduction
The statistics of failures of structures such as roads, buildings, dams and bridges throughout the nation
has increased geometrically ([2]). Therefore the usefulness of geophysical investigation in engineering sector of
our economy cannot be overemphasized. In recent years, many engineering professions such as civil,
geotechnical and electrical engineers have come to realize that geophysical investigation is very important; as
the information it furnishes assist these professionals in the design process of structure and utilities (e.g. dams,
bridges, highways, communication masts).
Most highways in Nigeria are known to fail shortly after construction and far less than their life
expectancy. Every year, millions of Naira are budgeted and expended on roads (Federal and State) but the same
problem would resurface after some few months of rehabilitation or reconstruction. This incessant failure of our
roads has now become a “thorn in the flesh” of our governments and that is why the geoscientists are working
assiduously hard to provide a lasting solution to the problem. However, road structure like any other engineering
structure, no matter how good its construction, needs routine maintenance to prevent rapid decline of the road
structures caused by ageing of materials, variations in age, disuse, accidental damage, mismatch between design
parameters and field condition during construction in order to serve its purpose optimally ([4]). The main aim of
maintenance is to carry out protective and repair measures to limit the detrimental effects of these natural or
imposed processes, and prolong the useful life of the roads. The non-maintenance scenario thus shortens the life
span of these structures, resulting in high vehicular operating cost, public casualties from accident and later
expensive rehabilitation reconstruction scheme ([1], [8], [10], [11], [15]).
The Akure-Ijare road, which is about 12 km in Ifedore local government of Ondo State “Fig. 1”, is the
major road that links Akure and Ijare. It has greatly contributed to the socio-economic development of Ondo
State and the country as a whole, as it helps in the movement of men and materials. Its incessant failure has both
economic and social effects on the inhabitant of the suburb communities, because it makes transportation
difficult and also restricts industries from moving into the region. The rate of accidents (human and material
losses) and hold-up of vehicles along the roadway is increasing daily. Subsequently, this has impeded the rate of
2. Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
DOI: 10.9790/0990-03624554 www.iosrjournals.org 46 | Page
development and socialization in the area. Hence, the need to establish the cause(s) of road failure necessitated
this study.
1.1 Description of the Project Environment
Akure-Ijare road lies within longitudes 5 ̊ 10 ˡ E and 5 ̊ 09ˡ E and latitudes 7 ̊ 21 ˡ N and 7 ̊ 17 ˡ N.
Expressed in the Universal Traverse Mercator (UTM) coordinates, the road is located within Northings 0806719
mN and 0812694 mN and Eastings 0738567 mE and 0739035 mE “Fig. 2”. At the time of study, two segments
of the road have failed (Orita-Obele axis and Ikota-Ijare axis) and these segments are named locality 1 and
locality 2.
Figure 1: Road map of Ondo State showing the investigated road ([12])
Figure 2: Road map of part of Akure-Ijare area showing the investigated road
The terrain of the road is relatively flat and it slopes gently from western to eastern part of the road
“Fig. 3”. The vegetation is of tropical rainforest and is characterized by thick forest of broad-leaved trees that
are ever green. The vegetation of the area is dense and made up of palm trees, kolanut trees and cocoa trees.
3. Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
DOI: 10.9790/0990-03624554 www.iosrjournals.org 47 | Page
1.2 Geology of the Area along the Studied Highway
The major rocks encountered in the study area are: migmatite gneiss, coarse porphyritic biotite
hornblende granite, charnockite, quartzite, medium to coarse grained biotite-granite, fine to medium grained
biotite granite gneiss and migmatite “Fig. 4”. However, from the geological map the road cut across two rock
units namely charnockite and medium coarse grained biotite-granite. However the major part of the road cut
across charnockitic rock.
II. Methods Of Study
At each of the established failed localities, one traverse each was made parallel to the road alignment.
This cut across the classified stable? and the failed segments of the localities. The length of traverse at localities
1 and 2 are 170 m and 250 m respectively “Fig. 2”.
2.1 VLF-EM Survey
The VLF - EM method utilized the inline profiling technique. The measurements were taken at 10 m
intervals along each traverse “Fig. 5”. The ABEM – WADI EM-VLF was used for the measurements. Although
both real and quadrature components of the VLF-EM field were measured, the real component data, which are
usually more diagnostic of linear features, were processed. The real and filtered real components were plotted
against stations position using „KHFFILT‟ software version 1.0 ([9]). The 2-D modeling of the filtered real
component was carried out using the same software. The profiles were interpreted qualitatively by visual
inspection of anomalies (conductor) that are diagnostic of possible geological structures in the bedrock while the
2-D modeling output was used for quantitative interpretation.
Figure 3: Topographical map of Akure-Ijare/Ifedore local government showing study highway ([6]).
4. Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
DOI: 10.9790/0990-03624554 www.iosrjournals.org 48 | Page
Figure 4: Geological map of Akure area showing the road under investigation ([7]).
2.2 Electrical Resistivity Survey
The electrical resistivity method utilized two field techniques - Vertical Electrical Sounding (VES)
using the Schlumberger array and combined horizontal profiling and vertical electrical sounding (2-D electrical
imaging) using dipole-dipole configuration. The same traverses were used in each locality as in VLF method.
Sounding stations were marked and pegged along the traverses at 20 m interval. Nine (9) sounding stations were
occupied at locality 1, while twelve (12) sounding stations were occupied at locality 2. The location of each
sounding stations in both geographic and Universal Traverse Mercator (UTM) coordinates was recorded with
the aid of the GARMIN 12 channel personal navigator - Geographic Positioning System (GPS) - unit. The
instrument used for the resistivity data collection was the Omega. The current electrode spacing (AB/2) was
varied from 1 m to 65 m. The apparent resistivity(𝜌 𝑎) measurements at each station were plotted against
electrode spacing (AB/2) on bi-logarithmic graph sheets. The resulting curves were then inspected visually to
determine the nature of the subsurface layering. In each way, each curve was characterized depending upon the
number and nature of the subsurface layers. Partial curve matching ([13]) was carried out for the quantitative
interpretation of the curves.
The results of the curve matching (layer resistivities and thicknesses) were fed into the computer as
starting model parameter in an iterative forward modeling technique using RESIST version 1.0 ([14]). From the
interpretation results, geoelectric sections along the traverses were produced. The interpreted result was
considered satisfactory since a good fit of RMS between the field curves and computer generated curves ranges
from 1.4 - 2.9. The results were also used to generate layer parameter histograms.
2.3 2-D Electrical Imaging
The same traverses used for the VLF data acquisition were used. The Dipole-Dipole array ([3]) was
used for the data acquisition. The inter-electrode spacing of 5m was adopted while inter-dipole separation factor
(n) was varied from 1 to 5. 2-D inversion modeling of the dipole-dipole data was carried out using DIPRO for
Windows ([5]) computer software.
5. Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
DOI: 10.9790/0990-03624554 www.iosrjournals.org 49 | Page
Figure 5: Field Layout at Locality 1 and 2 Showing VES Stations
III. Results And Discussion
The summary of the interpreted VES curves is presented in Table 1 – 2. The curve types identified in
the studied area are H, A and KH “Fig. 6”. The most occurring curve types are H-curve and A-type; with each
having 43 % and KH-curve type has 14 % of the entire curve types identified “Fig. 7”. All the curve types in
locality 1 are H-curve type. The curve shows that the lithologic sequence delineated are mainly 3 layers and 4
layers.
At locality 1, both the topsoil and the subsoil (weathered layer) in the upper 0 - 5 m are clayey within
the failed and the classified stable segments on both flanks “Fig. 8a and 8c”. The 2-D resistivity structure
correlates well with the geoelectric section displayed in “Fig. 8a”. The 2-D resistivity structure shows evidence
of basement depression at distance between 35 and 45, 55 and 70 m and 110 and 125 m. As revealed by the
resistivity structure, the bedrock topography is uneven “Fig. 8a and 8c”.
738200 738400 738600 738800 739000 739200 739400 739600 739800
806500
807000
807500
808000
808500
809000
809500
810000
810500
811000
811500
812000
812500
813000
813500
814000
Road Block
Junction
TO IKOTA
TO OSRC
STATION
TO IJARE
TOWN
0 500 1000m
.
...............................
Road Block
Junction
RoadBlock-Orita-ObeleRoad
.............................................
Ikota-IjareRoad
To Ijare
60m
0+0.2
Km
0+0.37
Km
0+1.0
Km
0+1.250 Km
SCALE
LEGEND
VES Stations
VLF Stations
. Dipole - Dipole Stations
Geotechnical Sample
Location
Failed Segment
Stable Segment
Study Location
Directional Arrow
Traverse Line
N
N
Scale
0 60 m
LOCALITY 1
LOCALITY 2
6. Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
DOI: 10.9790/0990-03624554 www.iosrjournals.org 50 | Page
The VLF-EM 2-D model “Fig. 8b” identified weakly conductive (faint-yellow colour) targets typical of
clay material or possible linear features with pockets of fairly resistive material (blue colour) as shown on
model. Their depth extents are generally within the upper 20 m on both the classified stable? and the failed
segment. However, the 2-D resistivity structure shows some discontinuities in the basement such as
fracture/fault, lithological contact e.t.c. that can act as a weak zones, which might have resulted to the failure of
the road between distances 35 and 45 m, 55 and 65 m, and 113 and 127 m. The locations of these geological
features are generally within the failed segment.
The overburden thickness along the failed segment is generally very thin. From the above it can be
concluded that, both the failed and the classified stable? segments are founded on topsoil/subsoil of very low
resistivity (< 100 Ω-m) which is typically clay, and both segments contain geological features such as fractures,
faults, lithological contact e.t.c which are zones of weakness that may increase porosity and fluid permeability
of the subsoil and hence decrease the engineering capability of the road pavement. Therefore road pavement
failure at this locality may have been precipitated by the incompetent clayey topsoil/subsoil, geological features
and thin over and thin overburden thickness.
At locality 2, both the topsoil and the weathered layer in the upper 0-3 m are composed of clay, sandy
clay, clayey sand and laterite beneath the failed and the classified stable? segments “Fig. 9a and Fig. 9c”. This
indicates high degree of heterogeneity in the upper layer. The geoelectric section and the 2-D resistivity
structure confirm the shallow nature of the basement bedrock (generally less than 2 m) along the failed segment
of the road compared to the classified stable? segments which shows an appreciable overburden thickness
(generally greater than 2 m) at both flanks. However, the geoelectric, 2-D VLF-EM model and 2-D resistivity
show no indication of geological features such as fractures/faults and lithological contacts in the bedrock, but
the bedrock mostly outcrop along the failed segment.
The failure at this locality may have been precipitated by the heterogeneity and clayey nature of the
upper layer. Also, lack of proper drainage at the road embankment and poor construction material may have
enhance the failure at this locality since the road is expected to be stable due to shallow nature of the bedrock.
IV. Conclusions
It can be concluded from the study that, the possible causes of pavement failure along the studied highway are:
incompetent clayey topsoil/subsoil; heterogeneity nature of the upper layer; lack of proper drainage at the road
embankment; and poor construction material, since the road is expected to be stable due to shallow nature of the
bedrock at locality 2.
This research work has made the following contributions to knowledge:
(i) it has provided information on the cause(s) of the failed segments of the investigated road;
(ii) it has served as a guide to road engineers; as information it provided assists during rehabilitation or
reconstruction of roads; and
(iii) it has served as an indispensable tool for road engineers that geophysical survey is essential for
preconstruction/design activities.
Table 1: VES Interpretated Results from Locality 1
VES NO
RESISTIVITY (ρ) (Ω-m) THICKNESS (h) (m)
CURVE TYPE
ρ1
ρ2
ρ3 h1 h2
1 99 11 229 1.0 3.6 H
2 53 25 729 0.7 4.1 H
3 81 20 490 0.7 6.2 H
4 67 17 280 0.6 1.8 H
5 41 13 321 1.2 2.9 H
6 44 12 301 1.1 2.6 H
7 52 17 270 0.8 1.5 H
8 75 21 1004 1.2 4.8 H
9 74 25 1075 1.2 5.5 H
7. Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
DOI: 10.9790/0990-03624554 www.iosrjournals.org 51 | Page
Table 2: VES Interpretated Results from Locality 2
VES NO
RESISTIVITY (ρ) (Ω-m) THICKNESS (h) (m)
CURVE TYPE
ρ1
ρ2
ρ3 ρ4 h1 h2 h3
1 148 353 ∞ 1.6 0.7 A
2 148 191 ∞ 1.3 0.9 A
3 28 775 ∞ 0.3 0.2 A
4 175 210 ∞ 1.7 0.3 A
5 87 6591 1719 ∞ 0.4 0.7 3.5 KH
6 243 661 ∞ 0.6 0.5 A
7 64 6533 ∞ 0.3 0.4 A
8 596 14614 1410 ∞ 0.7 1.4 2.4 KH
9 588 5066 6586 0.9 9.2 A
10 119 3321 2751 ∞ 0.5 9.5 2.6 KH
11 98 439 ∞ 1.0 0.1 A
12 141 2854 ∞ 1.5 0.2 A
(a) (b)
(c)
Figure 6: Typical curve types obtained in the Study Area (a) H curve (b) A curve (c) KH curve
8. Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
DOI: 10.9790/0990-03624554 www.iosrjournals.org 52 | Page
Figure 7: Histogram of Curve Types in the Studied Localities 1 and 2.
(a)
(b)
(c)
0m 20m 40m 60m 80m 100m 120m 140m 160m
-20
-10
0
Depth(m)
STABLE ? FAILED SEGMENT STABLE ?
WN
VES 1 2 3 4 5 6 7 8 9
Top soil Weathered Layer
5m
20m
Partly Weathered Layer/
Fracture/Fresh Basement
7475524499 53 81 67 41
11
25
20
17
13 12
17
21 25
1075
1004
270
301229
729
490
280
321
10. Geophysical Investigations of a Pavement Failure Along Akure-Ijare Road, Southwestern Nigeria
DOI: 10.9790/0990-03624554 www.iosrjournals.org 54 | Page
(c)
Figure 9: (a) Geoelectric Section, (b) 2-D Inversion Model and (c) 2-D Dipole-Dipole Resistivity Structure at
Location 2.
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