The document provides an introduction to mechanically stabilized earth walls and reinforced soil slopes, including:
- A historical overview of soil reinforcement techniques dating back centuries and the modern development of MSE walls and RSS in the 1960s.
- Definitions of key terminology used in design and construction of MSE walls and RSS.
- Details on the objectives, scope, and source documents for the guidelines on MSEW and RSS design and construction.
- A list of major manufacturers and suppliers of materials used in MSE walls and RSS.
This presentation summarizes the key aspects of a mat foundation. It was presented by 10 civil engineering students with their IDs listed. The presentation covered what a mat foundation is, when they are used, different types, construction procedures including soil testing, reinforcement placement, shuttering, casting, and curing. Construction steps like shoring, waterproofing and bracing were also explained depending on the depth of the foundation.
This document provides information on reinforced earth walls, including their components and construction methodology. It discusses that reinforced earth walls combine earth and linear reinforcing strips to bear large tensile stresses. The key components are reinforcing elements, soil backfill (which can be replaced with fly ash), and a facing element. Geogrids are used as reinforcements and provide strength in tension, while fly ash or soil in the backfill provides compression strength. The document also outlines design considerations around drainage, joint materials, and stability checks for these types of walls.
Geotechnical Engineering-II [Lec #17: Bearing Capacity of Soil]Muhammad Irfan
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
This report summarizes a document on laterally loaded piles. It discusses how piles transfer both vertical and lateral loads, with lateral loads coming from sources like wind, waves, earthquakes, and earth pressures. It describes mechanisms of load transfer, including shaft friction, end bearing, and lateral resistance from surrounding soil. When piles are in a group, they interact with each other through overlapping displacement fields. The report also summarizes various methods for analyzing laterally loaded piles and groups of piles, including rigid and finite element methods, as well as p-y curve approaches. It states that p-y curves are the best way to determine lateral load capacity in the field.
Micro-piling is one of the efficient and cost effective ground improvement technique which can be use various condition. It can use to support foundation as well as soil retention.
Pile foundation are essential in case where SBC is low or the load coming from superstructure is too heavy,
Topics covered includes Materials used for making piles, Type of piles, load transfer mechanism, factors affecting selection of piles, Installation methods, load carrying capacity of piles, different load tests performed and the behavior of piles as a group.
Principles and design concepts of reinforced soil wallsPrakash Ravindran
Reinforced soil walls are cost-effective retaining structures that can tolerate large settlements. They consist of layers of soil reinforced with tensile inclusions like geogrids or geotextiles. The reinforcement improves the soil strength allowing near-vertical faces to be constructed. Key advantages include flexibility, rapid construction, and ability to absorb movements. The document discusses design principles like external stability checks against sliding and bearing capacity failure. Internal stability checks reinforcement rupture and pullout capacity. Settlements, seismic design, and typical failures are also covered.
Discussed Topics:
Settlement of Shallow Foundation
Immediate Settlement
Consolidation Settlement
Created By-
Md. Ragib Nur Alam
130095
Civil Engineering
Ragibnur.ce@gmail.com
This presentation summarizes the key aspects of a mat foundation. It was presented by 10 civil engineering students with their IDs listed. The presentation covered what a mat foundation is, when they are used, different types, construction procedures including soil testing, reinforcement placement, shuttering, casting, and curing. Construction steps like shoring, waterproofing and bracing were also explained depending on the depth of the foundation.
This document provides information on reinforced earth walls, including their components and construction methodology. It discusses that reinforced earth walls combine earth and linear reinforcing strips to bear large tensile stresses. The key components are reinforcing elements, soil backfill (which can be replaced with fly ash), and a facing element. Geogrids are used as reinforcements and provide strength in tension, while fly ash or soil in the backfill provides compression strength. The document also outlines design considerations around drainage, joint materials, and stability checks for these types of walls.
Geotechnical Engineering-II [Lec #17: Bearing Capacity of Soil]Muhammad Irfan
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
This report summarizes a document on laterally loaded piles. It discusses how piles transfer both vertical and lateral loads, with lateral loads coming from sources like wind, waves, earthquakes, and earth pressures. It describes mechanisms of load transfer, including shaft friction, end bearing, and lateral resistance from surrounding soil. When piles are in a group, they interact with each other through overlapping displacement fields. The report also summarizes various methods for analyzing laterally loaded piles and groups of piles, including rigid and finite element methods, as well as p-y curve approaches. It states that p-y curves are the best way to determine lateral load capacity in the field.
Micro-piling is one of the efficient and cost effective ground improvement technique which can be use various condition. It can use to support foundation as well as soil retention.
Pile foundation are essential in case where SBC is low or the load coming from superstructure is too heavy,
Topics covered includes Materials used for making piles, Type of piles, load transfer mechanism, factors affecting selection of piles, Installation methods, load carrying capacity of piles, different load tests performed and the behavior of piles as a group.
Principles and design concepts of reinforced soil wallsPrakash Ravindran
Reinforced soil walls are cost-effective retaining structures that can tolerate large settlements. They consist of layers of soil reinforced with tensile inclusions like geogrids or geotextiles. The reinforcement improves the soil strength allowing near-vertical faces to be constructed. Key advantages include flexibility, rapid construction, and ability to absorb movements. The document discusses design principles like external stability checks against sliding and bearing capacity failure. Internal stability checks reinforcement rupture and pullout capacity. Settlements, seismic design, and typical failures are also covered.
Discussed Topics:
Settlement of Shallow Foundation
Immediate Settlement
Consolidation Settlement
Created By-
Md. Ragib Nur Alam
130095
Civil Engineering
Ragibnur.ce@gmail.com
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Independant study on Reinforced soil retaining wallparas6904
1. Reinforced soil retaining walls combine earth and linear reinforcement strips to resist tensile stresses that earth alone cannot. Henri Vidal first developed the concept by reinforcing a sandcastle with pine needles.
2. The document discusses the components, construction procedure, cost comparison, applications and benefits of reinforced soil retaining walls. It includes load transfer mechanisms, modes of failure, and principles of reinforced soil walls.
3. A literature review covers experimental and analytical studies on reinforced soil walls from 1992 to 2013 related to earth pressures, seismic performance, backfill properties, and geosynthetic reinforcements. Gaps in existing research are identified for further study.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
The document summarizes the plate load test, which determines the ultimate bearing capacity and settlement of soil under a given load. The test involves setting up a steel plate on the soil surface and applying a total load that is divided by the plate area to determine bearing capacity. Testing can be done via gravity or truss methods. Results are interpreted, but the test only reflects soil characteristics to twice the plate depth and doesn't indicate long-term settlements, particularly for cohesive soils. Values may also be conservative for large foundations in dense sands.
This document discusses expansive soils and provides information on their identification and treatment. It defines expansive soils as those that swell considerably when water is absorbed and shrink when water is removed. It describes the different mineral content that makes up clay soils, including tetrahedral and octahedral sheets. Methods for identifying expansive soils include mineralogical identification using X-ray diffraction and differential thermal analysis, as well as physical property tests like free swell, differential free swell, and swelling pressure. Foundations on expansive soils require special treatment to prevent damage from swelling.
1. The bearing capacity of a foundation refers to the ability of the soil to carry the loads from structures placed on it without shear failure or excessive settlement.
2. Terzaghi's bearing capacity theory separates the failure zone under a foundation into triangular and radial shear zones, and considers the equilibrium of forces within these zones to calculate the ultimate bearing capacity.
3. The allowable bearing capacity is calculated by applying a safety factor to the ultimate capacity to avoid shear failure. Settlement criteria may further limit the allowable capacity.
This document discusses the analysis and design of reinforced concrete footings. It describes different types of footings including isolated, combined, continuous, and raft foundations. It also covers design considerations such as minimum thickness, concrete cover, reinforcement sizes and spacing, and critical sections. An example is provided to demonstrate the step-by-step design of an isolated square footing, calculating loads, sizing the footing, checking effective depth, determining steel requirements, and verifying hook and dowel bar needs.
A case study on Ground improvement using Prefabricated Vertical Band Drains (...Nitin Kumar
Prefabricated Vertical Band Drains (PVD) are a ground improvement technique used to accelerate consolidation settlement of soft soil. A case study was conducted on a Mumbai construction site where PVDs were installed in soft soil to allow building foundations to be constructed sooner. Students Ramesh Kr. Bagariya, Manish Kumar, and Nitin Kumar presented the case study findings to their professor Dr. Rajib Sarkar.
The document provides guidelines for the design of reinforced concrete slab structures, including:
1) The effective span of a slab is the lesser of the clear span plus depth or the center-to-center distance between supports.
2) The depth of the slab depends on bending moment and deflection criteria, and can be estimated using provided formulas accounting for steel percentage and load class.
3) Loads on the slab include dead load from thickness, floor finish, and live loads ranging from 3 to 5 kN/m^2 depending on building occupancy.
The document provides information on different types of foundations used in construction. It discusses shallow foundations such as spread footings, combined footings, strap or cantilever footings, mat or raft foundations, and grillage foundations. It also covers deep foundations including pile foundations, caisson foundations, and well foundations. Pile foundations are described in more detail, outlining different types of piles based on their function and how they are constructed and used with pile caps to distribute loads to the soil.
This document discusses different types of retaining walls and their design considerations. It describes:
1. Gravity, cantilever, counterfort, and buttress retaining wall types based on their structural components and typical height ranges.
2. Design considerations for retaining walls including stability against overturning, sliding, and settlement; drainage; and structural design basis using load and safety factors.
3. An example problem showing calculations for earth pressure, restoring moments, and checking stability of a gravity wall.
This document provides an overview of deep excavation techniques. It discusses earth retaining walls used to restrain soil during deep excavations. Common types of retaining walls include braced walls, sheet pile walls, pile walls, diaphragm walls, and reinforced concrete walls. Supporting elements like ground anchors and struts are also discussed. Specific techniques covered include contiguous piles, secant piles, sheet piles, and the vertical soldiers and horizontal lagging method.
This document discusses bearing capacity theory and methods for determining the bearing capacity of soil. It defines key terms like maximum safe bearing capacity, allowable bearing pressure, and net pressure intensity. It describes different types of bearing capacity failure and assumptions in Terzaghi's bearing capacity method. The document also discusses other theories by Meyerhof, Vesic, and Skempton that improved on Terzaghi's method. Finally, it outlines field tests like plate load tests and laboratory tests to directly determine the bearing capacity of soil.
This document discusses foundation settlements and provides methods for estimating different types of settlements. It discusses:
- Immediate/elastic settlement which occurs during or right after construction and can be estimated using elastic theory equations.
- Consolidation settlement, which is time-dependent and occurs over months to years as water is squeezed out of clay soils. It includes primary consolidation from excess pore pressure dissipation and secondary compression from soil reorientation.
- Methods for estimating settlement in sandy soils using a strain influence factor approach.
- Equations for calculating primary and secondary consolidation settlement based on soil properties and changes in effective stress over time.
- Relationships between time factor, degree of consolidation, and rate of consolidation
A reinforced concrete mat foundation is a common type of foundation system used in many buildings. They are a specific type of shallow foundation that uses bearing capacity of the soil at or near the building base to transmit the loads to the soil. Compared to an ordinary slab on grade, a reinforced concrete mat is much thicker and is subjected to more substantial loads from the building.
Numerical problem bearing capacity terzaghi , group pile capacity (usefulsear...Make Mannan
A 1m wide strip footing is located 0.8m below ground in a c-φ soil. The soil properties are given. Using Terzaghi's analysis with a factor of safety of 3, the safe bearing capacity is calculated to be 112.1 kN/m^2.
A 2m x 3m rectangular footing at a depth of 1.5m in a different c-φ soil is considered. Using Terzaghi's analysis, the safe bearing capacities are calculated to be 471.7 kN/m^2 based on net ultimate capacity and 453.7 kN/m^2 based on ultimate capacity, both with a factor of safety of 3.
Shallow foundation(by indrajit mitra)01Indrajit Ind
Shallow foundations transmit structural loads to near-surface soils and are used when the upper soil layer is sufficiently strong. They include spread, combined, strap, and raft foundations. Design considers factors like bearing capacity, settlement, and water table effects. Plate load tests determine ultimate capacity and settlement by measuring pressure-displacement curves. Terzaghi's theory and IS codes provide design guidance.
The document discusses micropiles and provides information on their history, classifications, construction sequences, advantages, disadvantages, applications, and challenges. Micropiles were first introduced in the 1950s in Italy and have since been used widely in Europe and the US. They are small-diameter piles that are drilled and grouted, and can withstand axial and/or lateral loads. Key challenges with micropiles include their relatively high cost compared to other foundation techniques, the time-consuming nature of the construction process, and risks associated with the drilling and installation work.
Study of Reinforced Retaining Wall Over Predictable Considering Different Hei...ijtsrd
The use of geo textiles in MSE walls started after the beneficial effect of reinforcement with geo textiles was noticed in highway embankments over weak sub grades. The first geo textile reinforced wall was constructed in France in 1971, and the first structure of this type in the United States was constructed in 1974. Since about 1980, the use of geo textiles in reinforced soil has increased significantly. The first wall to use this technology in the United States was built in 1972 on California State Highway 39, north east of Los Angeles. In the last 25 years, more than 23,000 Reinforced Earth structures representing over 70 million m2 750 million ft2 of wall facing have been completed in 37 countries. More than 8,000 walls have been built in the United States since 1972. The highest wall constructed in the United States was of height 30 meters 98 feet Sami Raj Sahu | Deeksha Shrotriya | Abhay Kumar Jha "Study of Reinforced Retaining Wall Over Predictable Considering Different Heights" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47578.pdf Paper URL : https://www.ijtsrd.com/engineering/civil-engineering/47578/study-of-reinforced-retaining-wall-over-predictable-considering-different-heights/sami-raj-sahu
Quantity and Cost Calculations for Several Reinforced Earth Wall Types using ...ijtsrd
This document discusses a study on the quantity and cost calculations for several types of reinforced earth walls using different reinforcing materials. It was found that geosynthetic reinforced walls were the least costly for all wall heights. The document also examines factors that contribute to poor performance of segmental retaining walls, such as using incorrectly draining backfill material and contractor errors. The history and cost analysis of retaining walls is reviewed. Equations for calculating quantities and costs of reinforced earth wall components for different wall heights are presented. Design of reinforced earth walls and reinforced concrete retaining walls for varying heights is also discussed.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Independant study on Reinforced soil retaining wallparas6904
1. Reinforced soil retaining walls combine earth and linear reinforcement strips to resist tensile stresses that earth alone cannot. Henri Vidal first developed the concept by reinforcing a sandcastle with pine needles.
2. The document discusses the components, construction procedure, cost comparison, applications and benefits of reinforced soil retaining walls. It includes load transfer mechanisms, modes of failure, and principles of reinforced soil walls.
3. A literature review covers experimental and analytical studies on reinforced soil walls from 1992 to 2013 related to earth pressures, seismic performance, backfill properties, and geosynthetic reinforcements. Gaps in existing research are identified for further study.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
The document summarizes the plate load test, which determines the ultimate bearing capacity and settlement of soil under a given load. The test involves setting up a steel plate on the soil surface and applying a total load that is divided by the plate area to determine bearing capacity. Testing can be done via gravity or truss methods. Results are interpreted, but the test only reflects soil characteristics to twice the plate depth and doesn't indicate long-term settlements, particularly for cohesive soils. Values may also be conservative for large foundations in dense sands.
This document discusses expansive soils and provides information on their identification and treatment. It defines expansive soils as those that swell considerably when water is absorbed and shrink when water is removed. It describes the different mineral content that makes up clay soils, including tetrahedral and octahedral sheets. Methods for identifying expansive soils include mineralogical identification using X-ray diffraction and differential thermal analysis, as well as physical property tests like free swell, differential free swell, and swelling pressure. Foundations on expansive soils require special treatment to prevent damage from swelling.
1. The bearing capacity of a foundation refers to the ability of the soil to carry the loads from structures placed on it without shear failure or excessive settlement.
2. Terzaghi's bearing capacity theory separates the failure zone under a foundation into triangular and radial shear zones, and considers the equilibrium of forces within these zones to calculate the ultimate bearing capacity.
3. The allowable bearing capacity is calculated by applying a safety factor to the ultimate capacity to avoid shear failure. Settlement criteria may further limit the allowable capacity.
This document discusses the analysis and design of reinforced concrete footings. It describes different types of footings including isolated, combined, continuous, and raft foundations. It also covers design considerations such as minimum thickness, concrete cover, reinforcement sizes and spacing, and critical sections. An example is provided to demonstrate the step-by-step design of an isolated square footing, calculating loads, sizing the footing, checking effective depth, determining steel requirements, and verifying hook and dowel bar needs.
A case study on Ground improvement using Prefabricated Vertical Band Drains (...Nitin Kumar
Prefabricated Vertical Band Drains (PVD) are a ground improvement technique used to accelerate consolidation settlement of soft soil. A case study was conducted on a Mumbai construction site where PVDs were installed in soft soil to allow building foundations to be constructed sooner. Students Ramesh Kr. Bagariya, Manish Kumar, and Nitin Kumar presented the case study findings to their professor Dr. Rajib Sarkar.
The document provides guidelines for the design of reinforced concrete slab structures, including:
1) The effective span of a slab is the lesser of the clear span plus depth or the center-to-center distance between supports.
2) The depth of the slab depends on bending moment and deflection criteria, and can be estimated using provided formulas accounting for steel percentage and load class.
3) Loads on the slab include dead load from thickness, floor finish, and live loads ranging from 3 to 5 kN/m^2 depending on building occupancy.
The document provides information on different types of foundations used in construction. It discusses shallow foundations such as spread footings, combined footings, strap or cantilever footings, mat or raft foundations, and grillage foundations. It also covers deep foundations including pile foundations, caisson foundations, and well foundations. Pile foundations are described in more detail, outlining different types of piles based on their function and how they are constructed and used with pile caps to distribute loads to the soil.
This document discusses different types of retaining walls and their design considerations. It describes:
1. Gravity, cantilever, counterfort, and buttress retaining wall types based on their structural components and typical height ranges.
2. Design considerations for retaining walls including stability against overturning, sliding, and settlement; drainage; and structural design basis using load and safety factors.
3. An example problem showing calculations for earth pressure, restoring moments, and checking stability of a gravity wall.
This document provides an overview of deep excavation techniques. It discusses earth retaining walls used to restrain soil during deep excavations. Common types of retaining walls include braced walls, sheet pile walls, pile walls, diaphragm walls, and reinforced concrete walls. Supporting elements like ground anchors and struts are also discussed. Specific techniques covered include contiguous piles, secant piles, sheet piles, and the vertical soldiers and horizontal lagging method.
This document discusses bearing capacity theory and methods for determining the bearing capacity of soil. It defines key terms like maximum safe bearing capacity, allowable bearing pressure, and net pressure intensity. It describes different types of bearing capacity failure and assumptions in Terzaghi's bearing capacity method. The document also discusses other theories by Meyerhof, Vesic, and Skempton that improved on Terzaghi's method. Finally, it outlines field tests like plate load tests and laboratory tests to directly determine the bearing capacity of soil.
This document discusses foundation settlements and provides methods for estimating different types of settlements. It discusses:
- Immediate/elastic settlement which occurs during or right after construction and can be estimated using elastic theory equations.
- Consolidation settlement, which is time-dependent and occurs over months to years as water is squeezed out of clay soils. It includes primary consolidation from excess pore pressure dissipation and secondary compression from soil reorientation.
- Methods for estimating settlement in sandy soils using a strain influence factor approach.
- Equations for calculating primary and secondary consolidation settlement based on soil properties and changes in effective stress over time.
- Relationships between time factor, degree of consolidation, and rate of consolidation
A reinforced concrete mat foundation is a common type of foundation system used in many buildings. They are a specific type of shallow foundation that uses bearing capacity of the soil at or near the building base to transmit the loads to the soil. Compared to an ordinary slab on grade, a reinforced concrete mat is much thicker and is subjected to more substantial loads from the building.
Numerical problem bearing capacity terzaghi , group pile capacity (usefulsear...Make Mannan
A 1m wide strip footing is located 0.8m below ground in a c-φ soil. The soil properties are given. Using Terzaghi's analysis with a factor of safety of 3, the safe bearing capacity is calculated to be 112.1 kN/m^2.
A 2m x 3m rectangular footing at a depth of 1.5m in a different c-φ soil is considered. Using Terzaghi's analysis, the safe bearing capacities are calculated to be 471.7 kN/m^2 based on net ultimate capacity and 453.7 kN/m^2 based on ultimate capacity, both with a factor of safety of 3.
Shallow foundation(by indrajit mitra)01Indrajit Ind
Shallow foundations transmit structural loads to near-surface soils and are used when the upper soil layer is sufficiently strong. They include spread, combined, strap, and raft foundations. Design considers factors like bearing capacity, settlement, and water table effects. Plate load tests determine ultimate capacity and settlement by measuring pressure-displacement curves. Terzaghi's theory and IS codes provide design guidance.
The document discusses micropiles and provides information on their history, classifications, construction sequences, advantages, disadvantages, applications, and challenges. Micropiles were first introduced in the 1950s in Italy and have since been used widely in Europe and the US. They are small-diameter piles that are drilled and grouted, and can withstand axial and/or lateral loads. Key challenges with micropiles include their relatively high cost compared to other foundation techniques, the time-consuming nature of the construction process, and risks associated with the drilling and installation work.
Study of Reinforced Retaining Wall Over Predictable Considering Different Hei...ijtsrd
The use of geo textiles in MSE walls started after the beneficial effect of reinforcement with geo textiles was noticed in highway embankments over weak sub grades. The first geo textile reinforced wall was constructed in France in 1971, and the first structure of this type in the United States was constructed in 1974. Since about 1980, the use of geo textiles in reinforced soil has increased significantly. The first wall to use this technology in the United States was built in 1972 on California State Highway 39, north east of Los Angeles. In the last 25 years, more than 23,000 Reinforced Earth structures representing over 70 million m2 750 million ft2 of wall facing have been completed in 37 countries. More than 8,000 walls have been built in the United States since 1972. The highest wall constructed in the United States was of height 30 meters 98 feet Sami Raj Sahu | Deeksha Shrotriya | Abhay Kumar Jha "Study of Reinforced Retaining Wall Over Predictable Considering Different Heights" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47578.pdf Paper URL : https://www.ijtsrd.com/engineering/civil-engineering/47578/study-of-reinforced-retaining-wall-over-predictable-considering-different-heights/sami-raj-sahu
Quantity and Cost Calculations for Several Reinforced Earth Wall Types using ...ijtsrd
This document discusses a study on the quantity and cost calculations for several types of reinforced earth walls using different reinforcing materials. It was found that geosynthetic reinforced walls were the least costly for all wall heights. The document also examines factors that contribute to poor performance of segmental retaining walls, such as using incorrectly draining backfill material and contractor errors. The history and cost analysis of retaining walls is reviewed. Equations for calculating quantities and costs of reinforced earth wall components for different wall heights are presented. Design of reinforced earth walls and reinforced concrete retaining walls for varying heights is also discussed.
Research study on Soil Structure Interaction of Integrated Earth Retaining Wa...IRJET Journal
This document summarizes research on soil-structure interaction of integrated earth retaining walls. It discusses how precast concrete retaining walls can be constructed more quickly and cost effectively using interlocking blocks with mortar-less joints. The research aims to analyze such integrated retaining walls and evaluate their strength and deformation under lateral soil pressures through modeling in ANSYS software. Prior studies on precast retaining walls, soil-structure interaction, and use of relief shelves to increase wall stability are also reviewed.
Study of Cost Effectiveness of Reinforced Earth Wall Over Conventional Retain...ijtsrd
Reinforced Earth Wall RE Wall is an internally stabilized wall. Reinforced earth is a composite material formed by the friction between the earth and the reinforcement. By means of friction the soil transfers to the reinforcement the forces built up in the earth mass. The reinforcement thus develops tension and the earth behaves as if it has cohesion.Significant increase in the traffic and congestion across urban areas creates a demand for a better, efficient and economical soil retention system for bridges, underpasses, flyover and any other type of grade separator so the reduce the cost of the construction also to make structure more durable, reduce problem of the construction following points as has been studied. The objective of this study is to study the Cost Effectiveness between Retaining wall and Reinforced Earth Wall at different heights. The economic benefit achieved from the Reinforced Earth Wall increases with the increase in the height of the wall. Further, RE wall can be made more cost economical by using the combinations of different types of Geo grid and back fill material based on the soil and loading conditions Sami Raj Sahu | Deeksha Shrotriya | Barun Kumar "Study of Cost Effectiveness of Reinforced Earth Wall Over Conventional Retaining Wall Considering Different Heights" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47577.pdf Paper URL : https://www.ijtsrd.com/engineering/civil-engineering/47577/study-of-cost-effectiveness-of-reinforced-earth-wall-over-conventional-retaining-wall-considering-different-heights/sami-raj-sahu
This document summarizes the rehabilitation of a failing mechanically stabilized earth retaining wall using permanent soil nails. An investigation found the wall was failing due to improper drainage, unsuitable backfill compaction, and other factors. Ninety-three permanent soil nails were installed through the existing precast concrete panels to depths of up to 40 feet using a hydraulic rotary percussion drill. Verification testing of test nails found lower pullout capacities than initially estimated, requiring nail lengths to increase by 33% on redesign. Construction challenges including high entry points and utilities were addressed through specialized drilling methods and equipment.
The document discusses reinforced earth walls, which combine earth and linear reinforcing strips to bear large tensile stresses. It describes how Henri Vidal came up with the concept while trying to build a reinforced sandcastle. The key components of reinforced earth walls are the soil, which is strong in compression, reinforcement like steel or concrete that is strong in tension, and a skin or facing to retain the soil. The document outlines design considerations for reinforced earth retaining walls, including checking external stability as a whole structure and internal stability of reinforcement layers.
Soil cement walls for excavation supportJim McMullan
This document discusses two types of soil-cement walls for excavation support - single wall design and gravity wall design. It summarizes four case examples that illustrate the different designs:
1) A soil-cement cutoff wall and tied-back sheet pile wall were used to support a 32-foot deep excavation for a parking structure in Sacramento. The wall extended over 110 feet deep with a 10-foot key into low permeability soil.
2) A single row soil-cement wall was constructed along a roadway depression in San Jose to support an 18-20 foot deep excavation for a tunnel and roadway project. The wall extended through alternating clay and sand layers to the required depth.
The City of Edmonton was undertaking a project to widen Whitemud Drive and the Quesnell Bridge. The original design for the retaining wall presented constructability challenges. The HCM/Isherwood design-build team proposed an alternative design using a cast-in-place retaining wall supported by drilled caissons as a more feasible solution. Monitoring during construction identified weaker soil than expected, requiring design changes to ensure slope stability. The innovative design approach ultimately provided a safer and more constructable solution.
Comparative Review on Reinforced Soil and Reinforced Soil StructuresIRJET Journal
This document provides a review of reinforced soil and reinforced soil structures. It begins with an abstract that discusses the history of reinforced earth construction and modern reinforcing materials like geosynthetics. The document then reviews the literature on reinforced soil techniques. It describes different types of reinforcing materials that have been used, including natural materials like jute, bamboo and coir as well as modern geosynthetics. It provides details on the components of reinforced soil structures, including reinforcing elements, backfill soil, and facing elements. It discusses various types of reinforcing elements such as strips, grids, anchors and composites. It also describes considerations for backfill soil and different types of facing elements. Overall, the document presents information on
Reinforced earth is a construction material made of soil reinforced with horizontal layers of flexible inclusions like metal strips, grids, or fabric. It was invented in 1963 and is used widely in retaining walls, dams, bridge abutments, and other structures. The key components are soil, reinforcement, and a facing. The soil is confined by the reinforcement which resists the soil's lateral deformation under load. When loaded vertically, the soil wants to spread but is restrained by the reinforcement, which develops tensile forces that contribute to the structure's stability. Reinforced earth structures offer advantages like requiring less fill material and allowing steeper slopes, saving space. They can also be constructed directly on soft ground.
This document discusses ground improvement techniques used for the Penang Second Bridge project in Malaysia. It describes prefabricated vertical drains (PVDs), stone columns, and piled embankments. PVDs were used to accelerate consolidation of soft soils by shortening drainage paths. Stone columns were implemented to increase bearing capacity and reduce settlements. Piled embankments involved installing piles in soft soils to support the road embankment. These ground improvement methods enabled construction of the bridge approach spans and expressway across compressible soils.
Reinforced earth is a combination of earth and linear reinforcing strips that are capable of bearing large tensile stresses.
The reinforcement provided by these strips enable the mass to resist the tension in a way which the earth alone could not. The source of this resistance to tension is the internal friction of soil, because the stresses that are created within the mass are transferred from soil to the reinforcement strips by friction.
The document provides a review of soil nailing techniques for slope stabilization. Some key points:
1) Soil nailing involves inserting steel bars or nails into soil slopes and injecting grout to reinforce the slope and increase stability.
2) It has advantages over conventional retaining walls in that it requires less space and materials for construction and better interacts with the soil.
3) Numerical modeling has shown that nail orientation, length, spacing, and soil properties influence slope stability, with optimal inclination around 30 degrees.
4) Failure can occur via tension in the nails, pull-out of nails, shear stresses, or structural issues with nails/connections. Proper design and construction can prevent these.
The document provides details about the Structural Design and Drawing course CE8703 taught at Vivekanandha College of Technology for Women. It includes the course objectives, units covered, outcomes, design and drawing exercises, textbooks and code books referenced. The key topics covered in the course are design and drawing of retaining walls, flat slabs, bridges, liquid storage structures, industrial structures, girders and connections. The course aims to provide students with knowledge of structural engineering design principles and skills to design and draw various reinforced concrete and steel structures.
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MECHANICALLY STABILIZED EARTH WALLS AND REINFORCED SOIL SLOPES (1).pptx
1. MECHANICALLY STABILIZED EARTH WALLS AND
REINFORCED SOIL SLOPES DESIGN AND
CONSTRUCTION GUIDELINES
PRESENTED TO : SIR SARDAR BABAR
GROUP - 03
INTRODUCTION TO
MSEW AND RSS
3. OBJECTIVES:-
New methods and technologies of retention and steepened-slope
construction continue to be developed, often by specialty
contractors and suppliers, to solve problems in locations of restricted
Right-of-Way (ROW) and at marginal sites with difficult subsurface
conditions and other environmental constraints. Professionals
charged with the responsibility of planning, designing, and
implementing improvements and additions in such locations need to
understand the application, limitations and costs associated with a
host of measures and technologies available.
3
4. OBJECTIVES Cont..
The design, construction and monitoring
techniques for MSEW and RSS structures have
evolved over the last two decades as a result of
efforts by researchers, material suppliers and
government agencies to improve some single
aspect of the technology or the materials used.
4
5. a. Scope:-
The manual addresses in a comprehensive manner the following
areas:
• Overview of MSE development and the cost, advantages, and
disadvantages of using MSE structures.
• Available MSE systems and applications to transportation
facilities.
• Basic soil-reinforcement interaction.
• Design of routine and complex MSE walls.
• Design of steepened RSS.
5
6. a. Scope cont..
•Design of steepened RSS over soft foundations.
•Specifications and contracting approaches for both MSE
walls and RSS construction.
•Construction monitoring and inspection.
•Design examples as case histories with detailed cost
savings documented.
6
7. b. Source Document
The majority of the material presented in this Manual was abstracted from
FHWA RD89-043 "Reinforced Soil Structures, Volume 1 Design and Construction
Guidelines" , 1996 AASHTO Specifications, both Division 1, Design and Division II,
Construction, and direct input from the AASHTO Bridge T-15 Technical
Committee as part of their effort to update Section 5.8 of the AASHTO Bridge
Specifications which resulted in the 1997, 1998, 1999 and 2000 AASHTO
Interims.
Additional guidance, where not available from other sources, was specifically
developed for this Manual.
7
8. c. Terminology
Certain terminologies used in the manual are:
Inclusion is a generic term that encompasses all man-made
elements incorporated in the soil to improve its behavior.
Examples steel strips, geotextile sheets, steel or polymeric grids,
steel nails, and steel tendons between anchorage elements.
The term reinforcement is used only for those inclusions where soil-
inclusion stress transfer occurs continuously along the inclusion.
8
11. Terminology cont..
Mechanically Stabilized Earth Wall (MSEW) is a
generic term that includes reinforced soil (a term used
when multiple layers of inclusions act as reinforcement in
soils placed as fill).
Reinforced Earth is a trademark for a specific reinforced soil
system.
11
13. Terminology cont..
Reinforced Soil Slopes (RSS) are a form of reinforced soil
that incorporate planar reinforcing elements in constructed
earth-sloped structures with face inclinations of less than 70
degrees.
Geosynthetics is a generic term that encompasses flexible
polymeric materials used in geotechnical engineering such
as geotextiles, geomembranes, geonets, and grids (also
known as geogrids).
13
15. Terminology cont..
Facingis a component of the reinforced soil system used to
prevent the soil from raveling out between the rows of
reinforcement.
Common facings include precast concrete panels, dry cast modular
blocks, metal sheets & plates, gabions, welded wire mesh, shotcrete,
wood lagging & panels, and wrapped sheets of geosynthetics.
The facing also plays a minor structural role in the stability of the
structure. For RSS structures it usually consists of some type of
erosion control material.
15
16. Terminology cont..
Retained backfill is the fill material located
between the mechanically stabilized soil mass and
the natural soil.
Reinforced backfill is the fill material in which the
reinforcements are placed.
16
17. Cross Section:-
General X-Section of Reinforced Earth is shown:
17
Mechanically Stabilized Earth Mass – Principal Elements
Facing
Finished Grade
Mechanically Stabilized
Earth Mass
Foundation
Soil
Leveling Pad
Reinforcing inclusions
18. Historical Development:-
Retaining structures are essential elements of every highway design.
Retaining structures are used not only for bridge abutments and
wing walls but also for slope stabilization and to minimize right-of-
way for embankments. For many years, retaining structures were
almost exclusively made of reinforced concrete and were designed
as gravity or cantilever walls which are essentially rigid structures
and cannot accommodate significant differential settlements unless
founded on deep foundations. With increasing height of soil to be
retained and poor subsoil conditions, the cost of reinforced concrete
retaining walls increases rapidly.
18
19. Historical Development Cont..
Mechanically Stabilized Earth Walls (MSEW) and Reinforced Soil Slopes
(RSS) are cost-effective soil-retaining structures that can tolerate much
larger settlements than reinforced concrete walls. By placing tensile
reinforcing elements (inclusions) in the soil, the strength of the soil can
be improved significantly such that the vertical face of the
soil/reinforcement system is essentially self supporting. Use of a facing
system to prevent soil raveling between the reinforcing elements allows
very steep slopes and vertical walls to be constructed safely. In some
cases, the inclusions can also withstand bending from shear stresses,
providing additional stability to the system.
19
20. Historical Development Cont..
Inclusions have been used since prehistoric times to improve soil. The use
of straw to improve the quality of adobe bricks dates back to earliest human
history. Many primitive people used sticks and branches to reinforce mud
dwellings. During the 17th and 18th centuries, French settlers along the
Bay of Fundy in Canada used sticks to reinforce mud dikes. Some other early
examples of manmade soil reinforcement include dikes of earth and tree
branches, which have been used in China for at least 1,000 years and along
the Mississippi River in the 1880s. Other examples include wooden pegs used
for erosion and landslide control in England, and bamboo or wire mesh, used
universally for revetment erosion control. Soil reinforcing can also be
achieved by using plant roots.
20
21. Historical Development Cont..
The modern methods of soil reinforcement for retaining wall construction
were pioneered by the French architect and engineer Henri Vidal in the
early 1960s. His research led to the invention and development of
Reinforced Earth, a system in which steel strip reinforcement is used. The
first wall to use this technology in the United States was built in 1972 on
California State Highway 39, northeast of Los Angeles. In the last 25 years,
more than 23,000 Reinforced Earth structures representing over 70
million m2 (750 million ft2) of wall facing have been completed in 37
countries. More than 8,000 walls have been built in the United States
since 1972. The highest wall constructed in the United States was on the
order of 30 meters (98 feet).
21
22. Historical Development Cont..
The use of geotextiles in MSE walls and RSS started after the
beneficial effect of reinforcement with geotextiles was noticed in highway
embankments over weak subgrades. The first geotextile reinforced wall was
constructed in France in 1971, and the first structure of this type in the United
States was constructed in 1974. Since about 1980, the use of geotextiles in
reinforced soil has increased significantly.
Geogrids for soil reinforcement were developed around 1980. The first use of
geogrid in earth reinforcement was in 1981. Extensive use of geogrid products in
the United States started in about 1983, and they now comprise a growing
portion of the market.
22
23. Historical Development Cont..
The first reported use of reinforced steepened slopes is believed
to be the west embankment for the great wall of China. The
introduction and economy of geosynthetic reinforcements has made
the use of steepened slopes economically attractive. A survey of
usage in the mid 1980s identified several hundred completed
projects.
The highest constructed RSS structure in the U.S. to date has been 43
m (141 ft).
23
24. Historical Development Cont..
Current Usage: It is estimated that more than 700,000 m2
(7,500,000 ft2) of MSE retaining walls with precast facing are
constructed on average every year in the United States, which may
represent more than half of all retaining wall usage for transportation
applications.
The majority of the MSE walls for permanent applications either
constructed to date or presently planned use a segmental precast
concrete facing and galvanized steel reinforcements. The use of
geotextile faced MSE walls in permanent construction has been limited
to date. They are quite useful for temporary construction, where more
extensive use has been made.
24
25. Historical Development Cont..
Recently, modular block dry cast facing units have gained
acceptance due to their lower cost and nationwide
availability. These small concrete units are generally mated
with grid reinforcement, and the wall system is referred to
as modular block wall (MBW). It has been reported that
more than 200,000 m2 (2,000,000 ft2) of MBW walls have
been constructed yearly in the United States when
considering all types of transportation related applications.
The current yearly usage for transportation-related
applications is estimated at about 50 projects per year.
25
26. Historical Development Cont..
The use of RSS structures has expanded dramatically in the
last decade, and it is estimated that several hundred RSS
structures have been constructed in the United States.
Currently, 70 to 100 RSS projects are being constructed
yearly in connection with transportation related projects in
the United States, with an estimated projected vertical face
area of 130,000 m2/year (1,400,000 ft2/yr).
26
27. Manufacturers & Suppliers:-
Amoco Fabrics and Fibers
Co.
260 The Bluff
Austelle, GA 30168
BBA Nonwovens - Reemay,
Inc.
70 Old Hickory Blvd.
Old Hickory, TN 37138
Carthage Mills
4243 Hunt Road
Cincinnati, OH 45242
Colbond Geosynthetics
(Akzo)
95 Sand Hill Road
Enka, NC 28728
Contech Construction
Products
1001 Grove Street
Middletown, OH 45044
Huesker, Inc.
11107 A S. Commerce Blvd.
Charlotte, NC 28241
LINQ Industrial Fabrics, Inc.
2550 West 5th North
Street
Summerville, SC 29483
Luckenhaus North America
841 Main Street
Spartanburg, SC 29302
TC Mirafi
365 S. Holland Drive
Pendegrass, GA 30567
27
28. Manufacturers & Suppliers:-
Nicolon Corporation
3500 Parkway Lane, Suite
500
Norcross, GA 30092
Strata Systems, Inc.
425 Trible Gap Road
Cummings, GA 30130
Synthetic Industries
Construction Products
Division
4019 Industry Drive
Chattanooga, TN 37416
Tenax Corporation
4800 East Monument
Street
Baltimore, MD 21205
Tensar Earth Technologies
5883 Glenridge Drive, Suite
200
Atlanta, GA 30328
TNS Advanced
Technologies
681 Deyoung Road
Greer, SC 29651
28