The document discusses frost action and its effects on pavements. Frost action refers to frost heave, frost melting/thawing, and the alternating freezing and thawing cycles. Frost heave occurs when frozen soil expands and lifts the pavement surface due to water absorption. As temperatures rise, the frozen soil thaws and becomes soft, which can cause frost boils and damage pavement. Factors like soil type, temperature, water supply, and drainage influence frost action. Proper drainage systems, layered pavement design, and soil stabilization can prevent damage from frost action.
Ground improvement techniques are used to improve the engineering properties of soil, such as shear strength, stiffness, and permeability. They are required when soil properties are inadequate to support structures, or when soils are prone to swelling, shrinkage, collapse, or liquefaction. Common techniques include compaction, dewatering, reinforcement, grouting, and combinations thereof. The choice of technique depends on the soil type and purpose is to enable cost-effective foundation design and reduce the risks posed by problem soils.
The document discusses different types of pavements. It describes flexible pavements as having multiple layers that distribute loads through aggregate interlock. Rigid pavements distribute loads through the beam strength of concrete slabs. Flexible pavements are composed of surface, base, and sub-base layers over a subgrade, while rigid pavements typically only require a concrete surface layer. Both pavement types are designed to reduce loads from vehicles to prevent damage to the subgrade. The document compares advantages and disadvantages of flexible and rigid pavements.
Grouting involves injecting a slurry or liquid into soil or rock to fill voids and fractures. There are three main modes of grouting: permeation where grout flows freely into voids, compaction where grout remains intact and exerts pressure, and hydraulic fracturing where grout rapidly penetrates fractured zones. Grouting is used for applications like seepage control, soil stabilization, and vibration control. Common grout materials include suspensions of cement and water, emulsions of asphalt and water, and chemical solutions. Injection methods include permeation, compaction, jet, and soil fracture grouting. Proper planning of the grouting process including ground investigation, hole pattern, and sequencing is
Geosynthetics are man-made materials made from polymers that are used with soil and rock in civil engineering projects to improve their behavior. There are many types of geosynthetics that each have different properties and uses, including geotextiles, geogrids, geonets, geomembranes, geosynthetic clay liners, geocells, geofoam, and geocomposites. Common applications include roads, embankments, retaining walls, reservoirs, landfills, erosion control, and more. Each type has distinct characteristics that make it suitable for functions like separation, reinforcement, filtration, drainage, and containment.
Determining equivalent single wheel load.(ESWL) Imran Nawaz
This document discusses methods for determining equivalent single wheel loads (ESWL) and equivalent single axle loads (ESAL) for pavement design. ESWL is defined as the load from a single tire that causes the same stresses/strains as a multi-wheel load. Methods include equal stress, LCN, and FAA approaches. ESAL quantifies the effect of varying axle loads as a number of standard single axle loads. Factors like thickness and subgrade reaction are considered. Cars have minimal impact compared to trucks and buses.
This document provides information on flexible pavement design and theory. It discusses the typical layers of a flexible pavement including the surface course, base course, and subgrade. It also outlines several factors that affect pavement design such as wheel load, climate, and material characteristics. Additionally, the document examines failures like fatigue cracking and rutting that pavement design aims to prevent. It provides guidance on mechanistic-empirical design as prescribed by the Indian Roads Congress.
Ground improvement techniques are used to improve the engineering properties of soil, such as shear strength, stiffness, and permeability. They are required when soil properties are inadequate to support structures, or when soils are prone to swelling, shrinkage, collapse, or liquefaction. Common techniques include compaction, dewatering, reinforcement, grouting, and combinations thereof. The choice of technique depends on the soil type and purpose is to enable cost-effective foundation design and reduce the risks posed by problem soils.
The document discusses different types of pavements. It describes flexible pavements as having multiple layers that distribute loads through aggregate interlock. Rigid pavements distribute loads through the beam strength of concrete slabs. Flexible pavements are composed of surface, base, and sub-base layers over a subgrade, while rigid pavements typically only require a concrete surface layer. Both pavement types are designed to reduce loads from vehicles to prevent damage to the subgrade. The document compares advantages and disadvantages of flexible and rigid pavements.
Grouting involves injecting a slurry or liquid into soil or rock to fill voids and fractures. There are three main modes of grouting: permeation where grout flows freely into voids, compaction where grout remains intact and exerts pressure, and hydraulic fracturing where grout rapidly penetrates fractured zones. Grouting is used for applications like seepage control, soil stabilization, and vibration control. Common grout materials include suspensions of cement and water, emulsions of asphalt and water, and chemical solutions. Injection methods include permeation, compaction, jet, and soil fracture grouting. Proper planning of the grouting process including ground investigation, hole pattern, and sequencing is
Geosynthetics are man-made materials made from polymers that are used with soil and rock in civil engineering projects to improve their behavior. There are many types of geosynthetics that each have different properties and uses, including geotextiles, geogrids, geonets, geomembranes, geosynthetic clay liners, geocells, geofoam, and geocomposites. Common applications include roads, embankments, retaining walls, reservoirs, landfills, erosion control, and more. Each type has distinct characteristics that make it suitable for functions like separation, reinforcement, filtration, drainage, and containment.
Determining equivalent single wheel load.(ESWL) Imran Nawaz
This document discusses methods for determining equivalent single wheel loads (ESWL) and equivalent single axle loads (ESAL) for pavement design. ESWL is defined as the load from a single tire that causes the same stresses/strains as a multi-wheel load. Methods include equal stress, LCN, and FAA approaches. ESAL quantifies the effect of varying axle loads as a number of standard single axle loads. Factors like thickness and subgrade reaction are considered. Cars have minimal impact compared to trucks and buses.
This document provides information on flexible pavement design and theory. It discusses the typical layers of a flexible pavement including the surface course, base course, and subgrade. It also outlines several factors that affect pavement design such as wheel load, climate, and material characteristics. Additionally, the document examines failures like fatigue cracking and rutting that pavement design aims to prevent. It provides guidance on mechanistic-empirical design as prescribed by the Indian Roads Congress.
This document discusses various ground improvement techniques used to address problematic soils and ground conditions. It covers methods like compaction, dynamic compaction, vibro-displacement, preloading with vertical drains, deep soil mixing, grouting, ground freezing, biotechnical stabilization, reinforced soil, and geosynthetics reinforcement. The selection of a technique depends on factors like the type of ground, required improvement, constraints, and costs. Proper design, execution, and quality control are needed to effectively apply these ground improvement methods.
This document discusses several environmental factors that affect pavement design, including climatic factors like variation in moisture content, frost action, and temperature variation. Variation in moisture content depends on climatic conditions, groundwater levels, soil type, drainage, and pavement type. Both excess moisture and frost action can damage pavement by decreasing the stability and load-bearing capacity of the subgrade soil. Proper drainage systems and using frost-resistant materials can help prevent issues caused by moisture and frost. Temperature variations also impact pavement performance by changing the properties of bituminous materials in flexible pavement and causing stresses in rigid pavement.
This document discusses different methods for soil stabilization, including mechanical, physical, chemical, and bituminous stabilization. Mechanical stabilization involves compacting soil to increase density and strength. Physical stabilization involves blending soils or adding admixtures to improve properties. Chemical stabilization uses lime, cement, or other chemicals like calcium chloride to react with soils and modify their characteristics. Bituminous stabilization involves adding bitumen or asphalt to seal soil pores and increase cohesion between particles. The document provides details on appropriate soil types, required quantities, and construction methods for each stabilization technique.
Workability refers to the ease with which fresh concrete can be mixed, placed, compacted and finished. It is affected by factors like water content, mix proportions, aggregate size and shape, grading and surface texture. Increasing water content or using admixtures improves workability by acting as a lubricant between particles. Larger, rounded aggregates require less water than smaller, angular ones. Well-graded aggregates with minimal voids also increase workability. Workability can be measured using slump, compacting factor, flow, or Vee Bee tests.
Bitumen is a complex mixture of organic compounds that is primarily used for road construction. It originates from petroleum and naturally occurring deposits. Bitumen ages over time through oxidation and loss of volatile components, resulting in properties like decreased penetration and increased hardness. The rate of aging depends on factors like temperature, oxygen levels, and filler content. Standard tests like thin film oven testing and pressure aging vessel testing are used to simulate short and long-term aging. Rejuvenation and fillers can help combat the effects of aging and extend pavement lifespan.
This document provides an overview of slope stability and analysis. It defines different types of slopes as natural, man-made, infinite and finite. Common causes of slope failure like erosion, seepage, drawdown, rainfall, earthquakes and external loading are described. Key terms used in slope stability are defined, including slip zone, slip plane, sliding mass and slope angle. Types of slope failures are identified as face/slope failure, toe failure and base failure. Methods for analyzing finite slope stability, like Swedish circle method, Bishop's simplified method and Taylor's stability number are introduced. Infinite slope analysis is described for cohesionless, cohesive and cohesive-frictional soils. Example tutorial problems on slope stability calculations are
The document discusses permeability, which is the property of soil that allows water to flow through it. Permeability depends on factors like particle size, void ratio, and degree of saturation. Methods to determine the coefficient of permeability include constant head tests, falling head tests, and pumping tests. Darcy's law states that the rate of water flow through soil is proportional to the hydraulic gradient, where the coefficient of proportionality is the permeability. The law was established by Henry Darcy based on experiments in 1856 and is valid for laminar flow through saturated soils.
The document discusses different types of geosynthetics including geotextiles, geogrids, geomembranes, and geocomposites. It provides details on their manufacturing processes and applications in civil engineering projects. Geotextiles include woven, nonwoven, knitted, and stitched fabrics that are used for separation, filtration, drainage, reinforcement, and erosion control. Geogrids and geomembranes are stiff polymer sheets used for reinforcement and as barriers. The document outlines common functions of geosynthetics like separation, reinforcement, filtration, drainage, and erosion control. It provides examples of their applications in walls, waste water treatment, and other civil works. Properties discussed include physical characteristics and hydraulic
Types of Failures in Rigid Pavements Joint Spalling in Rigid Pavements. Excessive compressive stress causes deterioration in the joints,... Faulting in Rigid Pavements. The difference in elevation between the joints is called as faulting. Polished Aggregate in Rigid Pavements. The repeated traffic ...
rigid pavement pdf
rigid pavement and flexible pavement
rigid pavement design
rigid pavement construction
flexible pavement versus rigid pavement
aashto rigid pavement design
aashto rigid pavement calculator
rigid pavement pdf
rigid pavement and flexible pavement
rigid pavement design
rigid pavement construction
flexible pavement versus rigid pavement
aashto rigid pavement design
Compaction, Its definition, uses, Factors affecting compaction
Field compaction methods and equipments. Solved Numerical and graphical representation of compaction curve and Zero air void line to obtain Optimum moistute content and Maximum dry density.
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.
This document discusses rigid pavement distress in concrete roads. It defines rigid pavements as those made of Portland cement concrete which distributes loads through slab action. Common distresses include cracking, faulting, spalling, blowups and polished aggregates. Factors that affect pavement performance are traffic loads, material properties, and the environment. Maintenance and rehabilitation methods like crack sealing are used to slow deterioration and repair existing pavements.
The document discusses various ground improvement techniques including removal and replacement, in-situ densification methods like dynamic compaction, preloading, use of vertical drains and stone columns. It provides details on specific in-situ densification methods like vibro-float compaction using a vibrating probe, dynamic compaction using heavy weights, and explosive compaction using detonated charges. The document also summarizes advantages and limitations of preloading using surcharge fills and uses of vertical drains and geosynthetics to accelerate consolidation.
The document discusses various techniques for soil stabilization used in road construction. It defines soil stabilization as treating soil to maintain or improve its performance. Key techniques include mechanical stabilization by blending soils, and chemical stabilization by adding lime, cement or other chemicals. Mechanical methods improve strength through compaction and grading, while chemical additives cause reactions improving properties like strength and durability over time. The document provides details on various soil stabilization mixtures and their applications in road construction.
This document discusses the types and uses of geotextiles in pavement construction. It describes the three main types of geotextiles - woven, non-woven, and knitted - and explains how they are manufactured. The key functions of geotextiles in pavement are identified as separation, filtration, reinforcement, drainage, and erosion control. Geotextiles are typically placed between the subgrade and aggregate base layers in pavement to prevent mixing of materials and increase pavement strength and lifespan.
The presentation illustrates a technique for ground improvement, Grouting. In India, grouting is still not being used very much. In this presentation, I have demonstrated the basic types of grouting, goals of ground improvement and two case studies of grouting.
The document discusses different types of pavements used for highways. It describes flexible pavements which transmit wheel loads through grain-to-grain contact and consist of multiple layers including the surface course, binder course, base course, and sub-base course. Rigid pavements have sufficient strength to distribute loads over a wider area and typically consist of concrete over a single granular or stabilized layer. The document also covers pavement materials like soils, aggregates, and asphalt concrete and tests used to evaluate soil strength properties important for pavement design like the California Bearing Ratio test.
Reinforced earth is a composite material that combines soil with tension-resistant reinforcing elements like metal sheets, strips, or nets. It was developed in 1966 by French engineer Henri Vidal and improves the engineering properties of soil. Reinforced earth is commonly used in retaining walls, embankments, and other structures due to its technical advantages and cost-effectiveness. It provides increased stability through the use of sheet, strip, or grid reinforcements made of materials like steel or synthetic polymers.
The California Bearing Ratio (CBR) test measures the bearing capacity of a soil by determining the ratio of the force required to penetrate a soil mass with a standard plunger to that of a standard material. It is used to classify and evaluate soils for flexible pavement subgrades and bases. The procedure involves compacting a soil sample, soaking it for 4 days, and then applying a load through a plunger at a rate of 1.25 mm/min while measuring penetration. Load readings are recorded and used to calculate the CBR value based on standard pressures at 2.5 and 5.0 mm penetrations.
This document provides information about a geotechnical engineering core course. It includes details like the course code, credits, instructor, and units covered. Some of the key topics covered in the course include soil moisture states, capillarity in soils, permeability of soils, laboratory and field tests to determine permeability, seepage in soils, stress in soils, and quick sand phenomena. The document also provides summaries of these topics and examples of related calculations.
Winter ecology notes frost, snow, and icemikelink45
The basic aspects of winter revolve around water and how it freezes and how our bodies try to prevent its freezing. In the exterior world ice, frost, snow are expressions of the winter season.
This document discusses various ground improvement techniques used to address problematic soils and ground conditions. It covers methods like compaction, dynamic compaction, vibro-displacement, preloading with vertical drains, deep soil mixing, grouting, ground freezing, biotechnical stabilization, reinforced soil, and geosynthetics reinforcement. The selection of a technique depends on factors like the type of ground, required improvement, constraints, and costs. Proper design, execution, and quality control are needed to effectively apply these ground improvement methods.
This document discusses several environmental factors that affect pavement design, including climatic factors like variation in moisture content, frost action, and temperature variation. Variation in moisture content depends on climatic conditions, groundwater levels, soil type, drainage, and pavement type. Both excess moisture and frost action can damage pavement by decreasing the stability and load-bearing capacity of the subgrade soil. Proper drainage systems and using frost-resistant materials can help prevent issues caused by moisture and frost. Temperature variations also impact pavement performance by changing the properties of bituminous materials in flexible pavement and causing stresses in rigid pavement.
This document discusses different methods for soil stabilization, including mechanical, physical, chemical, and bituminous stabilization. Mechanical stabilization involves compacting soil to increase density and strength. Physical stabilization involves blending soils or adding admixtures to improve properties. Chemical stabilization uses lime, cement, or other chemicals like calcium chloride to react with soils and modify their characteristics. Bituminous stabilization involves adding bitumen or asphalt to seal soil pores and increase cohesion between particles. The document provides details on appropriate soil types, required quantities, and construction methods for each stabilization technique.
Workability refers to the ease with which fresh concrete can be mixed, placed, compacted and finished. It is affected by factors like water content, mix proportions, aggregate size and shape, grading and surface texture. Increasing water content or using admixtures improves workability by acting as a lubricant between particles. Larger, rounded aggregates require less water than smaller, angular ones. Well-graded aggregates with minimal voids also increase workability. Workability can be measured using slump, compacting factor, flow, or Vee Bee tests.
Bitumen is a complex mixture of organic compounds that is primarily used for road construction. It originates from petroleum and naturally occurring deposits. Bitumen ages over time through oxidation and loss of volatile components, resulting in properties like decreased penetration and increased hardness. The rate of aging depends on factors like temperature, oxygen levels, and filler content. Standard tests like thin film oven testing and pressure aging vessel testing are used to simulate short and long-term aging. Rejuvenation and fillers can help combat the effects of aging and extend pavement lifespan.
This document provides an overview of slope stability and analysis. It defines different types of slopes as natural, man-made, infinite and finite. Common causes of slope failure like erosion, seepage, drawdown, rainfall, earthquakes and external loading are described. Key terms used in slope stability are defined, including slip zone, slip plane, sliding mass and slope angle. Types of slope failures are identified as face/slope failure, toe failure and base failure. Methods for analyzing finite slope stability, like Swedish circle method, Bishop's simplified method and Taylor's stability number are introduced. Infinite slope analysis is described for cohesionless, cohesive and cohesive-frictional soils. Example tutorial problems on slope stability calculations are
The document discusses permeability, which is the property of soil that allows water to flow through it. Permeability depends on factors like particle size, void ratio, and degree of saturation. Methods to determine the coefficient of permeability include constant head tests, falling head tests, and pumping tests. Darcy's law states that the rate of water flow through soil is proportional to the hydraulic gradient, where the coefficient of proportionality is the permeability. The law was established by Henry Darcy based on experiments in 1856 and is valid for laminar flow through saturated soils.
The document discusses different types of geosynthetics including geotextiles, geogrids, geomembranes, and geocomposites. It provides details on their manufacturing processes and applications in civil engineering projects. Geotextiles include woven, nonwoven, knitted, and stitched fabrics that are used for separation, filtration, drainage, reinforcement, and erosion control. Geogrids and geomembranes are stiff polymer sheets used for reinforcement and as barriers. The document outlines common functions of geosynthetics like separation, reinforcement, filtration, drainage, and erosion control. It provides examples of their applications in walls, waste water treatment, and other civil works. Properties discussed include physical characteristics and hydraulic
Types of Failures in Rigid Pavements Joint Spalling in Rigid Pavements. Excessive compressive stress causes deterioration in the joints,... Faulting in Rigid Pavements. The difference in elevation between the joints is called as faulting. Polished Aggregate in Rigid Pavements. The repeated traffic ...
rigid pavement pdf
rigid pavement and flexible pavement
rigid pavement design
rigid pavement construction
flexible pavement versus rigid pavement
aashto rigid pavement design
aashto rigid pavement calculator
rigid pavement pdf
rigid pavement and flexible pavement
rigid pavement design
rigid pavement construction
flexible pavement versus rigid pavement
aashto rigid pavement design
Compaction, Its definition, uses, Factors affecting compaction
Field compaction methods and equipments. Solved Numerical and graphical representation of compaction curve and Zero air void line to obtain Optimum moistute content and Maximum dry density.
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.
This document discusses rigid pavement distress in concrete roads. It defines rigid pavements as those made of Portland cement concrete which distributes loads through slab action. Common distresses include cracking, faulting, spalling, blowups and polished aggregates. Factors that affect pavement performance are traffic loads, material properties, and the environment. Maintenance and rehabilitation methods like crack sealing are used to slow deterioration and repair existing pavements.
The document discusses various ground improvement techniques including removal and replacement, in-situ densification methods like dynamic compaction, preloading, use of vertical drains and stone columns. It provides details on specific in-situ densification methods like vibro-float compaction using a vibrating probe, dynamic compaction using heavy weights, and explosive compaction using detonated charges. The document also summarizes advantages and limitations of preloading using surcharge fills and uses of vertical drains and geosynthetics to accelerate consolidation.
The document discusses various techniques for soil stabilization used in road construction. It defines soil stabilization as treating soil to maintain or improve its performance. Key techniques include mechanical stabilization by blending soils, and chemical stabilization by adding lime, cement or other chemicals. Mechanical methods improve strength through compaction and grading, while chemical additives cause reactions improving properties like strength and durability over time. The document provides details on various soil stabilization mixtures and their applications in road construction.
This document discusses the types and uses of geotextiles in pavement construction. It describes the three main types of geotextiles - woven, non-woven, and knitted - and explains how they are manufactured. The key functions of geotextiles in pavement are identified as separation, filtration, reinforcement, drainage, and erosion control. Geotextiles are typically placed between the subgrade and aggregate base layers in pavement to prevent mixing of materials and increase pavement strength and lifespan.
The presentation illustrates a technique for ground improvement, Grouting. In India, grouting is still not being used very much. In this presentation, I have demonstrated the basic types of grouting, goals of ground improvement and two case studies of grouting.
The document discusses different types of pavements used for highways. It describes flexible pavements which transmit wheel loads through grain-to-grain contact and consist of multiple layers including the surface course, binder course, base course, and sub-base course. Rigid pavements have sufficient strength to distribute loads over a wider area and typically consist of concrete over a single granular or stabilized layer. The document also covers pavement materials like soils, aggregates, and asphalt concrete and tests used to evaluate soil strength properties important for pavement design like the California Bearing Ratio test.
Reinforced earth is a composite material that combines soil with tension-resistant reinforcing elements like metal sheets, strips, or nets. It was developed in 1966 by French engineer Henri Vidal and improves the engineering properties of soil. Reinforced earth is commonly used in retaining walls, embankments, and other structures due to its technical advantages and cost-effectiveness. It provides increased stability through the use of sheet, strip, or grid reinforcements made of materials like steel or synthetic polymers.
The California Bearing Ratio (CBR) test measures the bearing capacity of a soil by determining the ratio of the force required to penetrate a soil mass with a standard plunger to that of a standard material. It is used to classify and evaluate soils for flexible pavement subgrades and bases. The procedure involves compacting a soil sample, soaking it for 4 days, and then applying a load through a plunger at a rate of 1.25 mm/min while measuring penetration. Load readings are recorded and used to calculate the CBR value based on standard pressures at 2.5 and 5.0 mm penetrations.
This document provides information about a geotechnical engineering core course. It includes details like the course code, credits, instructor, and units covered. Some of the key topics covered in the course include soil moisture states, capillarity in soils, permeability of soils, laboratory and field tests to determine permeability, seepage in soils, stress in soils, and quick sand phenomena. The document also provides summaries of these topics and examples of related calculations.
Winter ecology notes frost, snow, and icemikelink45
The basic aspects of winter revolve around water and how it freezes and how our bodies try to prevent its freezing. In the exterior world ice, frost, snow are expressions of the winter season.
Hydrology is the science of water on Earth. It studies the occurrence, circulation, and distribution of water, including precipitation, evaporation, soil moisture, groundwater, runoff, and flooding. There are two main types - scientific hydrology which studies physical processes, and engineering hydrology which applies scientific principles to water resources. The hydrologic cycle describes the continuous movement of water on, above, and below the surface of the Earth, including storage and transport through different physical states driven by energy from the sun.
Study of wind turbine foundations in cold climates Anders Bernholdsson, Nordi...Winterwind
This document provides an overview of processes affecting wind turbine foundations in cold climates and the engineering challenges related to their design and construction. Key points discussed include:
1) Frost action can cause frost heave, thaw weakening, and thaw settlement of soil, affecting foundation stability. Silt soils are most susceptible to frost heave.
2) Factors influencing frost depth include soil properties, groundwater, insulation. Models like Stefan's formula can estimate ultimate frost depth for design.
3) Site investigations of temperature, soil properties, and groundwater are needed to understand local ground conditions and frost impacts.
4) Foundation design considerations for cold climates include mitigating frost impacts through depth,
This document discusses ground freezing as a method for excavation support and groundwater control. It describes how ground freezing works by circulating a refrigerant through pipes to freeze the surrounding soil, improving its strength and impermeability. The key advantages are that frozen ground can support excavations without bracing and acts as an impermeable barrier to groundwater flow. Applications mentioned include using ground freezing for shallow and deep excavations, tunneling, and creating underground cutoff walls.
This document discusses weathering, erosion, and deposition processes that shape the Earth's surface. It explains that weathering breaks down rock through physical or chemical means. Erosion then transports weathered material, which is eventually deposited elsewhere. The main agents of erosion are water, wind, ice, and gravity. Glaciers in particular played a major role in shaping landscapes like those in New York State. The document also examines how climate, rock type, and other geologic factors influence landscape development over time.
When rain reaches the ground, it can infiltrate into the soil and become groundwater, evaporate, or run off as surface water. The infiltration rate depends on factors like slope, soil saturation, porosity, permeability, and vegetation. Around 50% of rain typically evaporates, 18% infiltrates into the groundwater, and 32% runs off. Groundwater resides in aquifers below the water table. Pumping groundwater can lower the water table and dry up wells, springs, streams, and wetlands over time.
Here are the key periglacial processes likely occurring around the glacier shown in Figure 2:
- Frost shattering of rock producing scree slopes at the base of valley sides due to repeated freezing and thawing.
- Solifluction occurring on valley sides within the active layer, transporting fine material downslope and leaving lobes and terraces.
- Nivation occurring in hollows beneath snowpatches on north-facing slopes, deepening the hollows through frost action and meltwater erosion.
- Patterned ground such as stone stripes forming in better drained areas subjected to freeze-thaw cycles.
- Fluvial erosion by meltwater streams flowing from the glacier, causing erosion and leaving braided
The document discusses key components of the water cycle and climate systems on Earth. It describes how water circulates between the atmosphere, land, and oceans through processes like precipitation, infiltration, evaporation, transpiration, and runoff. It also explains how climate is influenced by factors like latitude, elevation, proximity to large bodies of water, orographic effects of mountains, and ocean currents. The water and energy cycles driven by these hydrologic and atmospheric processes are essential to maintaining Earth's habitability.
This document discusses seepage control and dewatering methods used in construction projects. It describes the need for dewatering excavation sites to allow for safe and efficient construction. The key dewatering methods discussed are seepage control linings, cutoffs, drainage systems, and pumping groundwater via wells. It also covers ground freezing as another method to temporarily stabilize soils by turning water into ice. The document provides details on factors that influence freezing like thermal conductivity and heat capacity of soils. It emphasizes the importance of properly discharging water and monitoring sites during dewatering activities.
This document discusses ground freezing as a technique for construction dewatering. It begins with an introduction and overview of the principle, purpose, process, equipment and characteristics of ground freezing. The main advantages are then outlined. Applications of ground freezing are described through case studies of circular excavation support, shaft sinking, tunnel construction and an aquarius project in Canada. Steps in the ground freezing process are explained through diagrams. In conclusion, the versatility of ground freezing for construction is demonstrated through this presentation and case studies.
The document discusses infiltration, which is the process of rainwater entering soil. Infiltrated water first meets soil moisture needs, and excess percolates downwards. The infiltration capacity of soil is the maximum rate at which it can absorb water. Actual infiltration depends on rainfall intensity and soil capacity. Infiltration decreases over time and with soil moisture. The rate is measured in mm/hr using an infiltrometer. Factors like soil type, slope, and vegetation cover affect infiltration.
Physical Causes And Consequences Of Mass Movementtudorgeog
Mass movement refers to the downhill movement of weathered rock and soil material under the influence of gravity. Different types of mass movement include fast movements like landslides and mudflows, and slow movements like soil creep and solifluction. The amount, rate, and type of mass movement on a slope depends on factors that influence slope stability such as the slope angle, rock type, climate, vegetation, and human activities.
Hydrological cycle- Meteorological measurements – Requirements, types and forms of Precipitation-Rain Gauges-Spatial analysis of rainfall data using Thiessen and Isohyetal methods Infiltration-Infiltration Index-Interception-Evaporation, Watershed, catchment and basin - Catchment characteristics - factors affecting runoff – Runoff estimation using empirical
Erosion of soil is a very common phenomenon. Since the natural growth rate of soil is very slow, it is required to prevent erosion of soil artificially. Erosion control is also necessary to give stability to the other structures against landslide, etc., and it is also finds its requirement in saving the plnats and soil formation agains failure during rain or due to gravity or due to many other reasons.
It has been a little effort to present Type of errosions and their preventive measures.
Message: This is made to be presented in Seminar, as a part of my B. Tech. in Civil Engineering Coarse.
This document is a seminar paper on precipitation submitted by Sagar Singh B to their lecturer Ramya D. It defines precipitation as water falling from clouds under gravity in forms like rain, snow, or hail. It describes different types of precipitation such as rain, drizzle, snow, hail, glaze, rime, and sleet. It explains how precipitation forms in warm and cold clouds through processes like collision-coalescence and Bergeron. It also discusses international weather modification techniques for snow and rain making, fog dispersal, hail suppression, and frost prevention.
24. Evaluation of temperature and freeze–thaw effects on excess pore pressure...PinakRay2
This document discusses a laboratory study that evaluated how temperature and freeze-thaw cycles affect excess pore pressure generation in fine-grained soils. Specifically, the study investigated the effects of conditioning soil specimens at various temperatures ranging from 24°C to -0.2°C, as well as subjecting specimens to 1-4 freeze-thaw cycles. Strain-controlled cyclic triaxial tests were performed and found that excess pore pressure generation differed significantly depending on conditioning temperature, with a transitional change observed near freezing. Subjecting specimens to freeze-thaw cycles slightly reduced excess pore pressure generation. The temperature path to reach near-freezing temperatures also influenced pore pressure development.
This document discusses factors that affect the shape of a hydrograph during a rainstorm, specifically mentioning basin lag time. It notes that a longer lag time and shallower rising limb can occur if snow is on the ground acting as a storage area, or if the ground is permeable. A steeper rising limb and shorter lag time may result from intense rainfall, saturated ground from previous rain, steep slopes promoting rapid overland flow, or impermeable surfaces from urbanization.
Null Bangalore | Pentesters Approach to AWS IAMDivyanshu
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
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The Python for beginners. This is an advance computer language.
Seminar on frost action
1. SEMINAR ON FROSTSEMINAR ON FROST
ACTIONACTION
ByBy
Shruthi.N.PShruthi.N.P
LecturerLecturer
GPT,HariharaGPT,Harihara
2. INTRODUTIONINTRODUTION
►The climatic variations cause following majorThe climatic variations cause following major
effectseffects
Frost actionFrost action
Variation in moisture conditionVariation in moisture condition
Variation in temperatureVariation in temperature
3. Cont..Cont..
►The pavement performance is very muchThe pavement performance is very much
affected by the variation in moisture and theaffected by the variation in moisture and the
frost.frost.
►This is mainly because of the variation inThis is mainly because of the variation in
stability and the volume of the subgrade soilstability and the volume of the subgrade soil
due to these two effects.due to these two effects.
►Variation in temperature generally affects theVariation in temperature generally affects the
pavement materials like bituminous mixes andpavement materials like bituminous mixes and
cement concrete.cement concrete.
4. FROST ACTIONFROST ACTION
►The effect of rainfall on pavementThe effect of rainfall on pavement
performance has not received as muchperformance has not received as much
attention as that of frost actionattention as that of frost action
►Frost action refers to the adverse effects due toFrost action refers to the adverse effects due to
frost heave,frost melting or thaw and alternatefrost heave,frost melting or thaw and alternate
cycles of freezing and thawing.cycles of freezing and thawing.
►Frost damage to pavements and theirFrost damage to pavements and their
subgrades occurs in two distinct phases.subgrades occurs in two distinct phases.
5. First phaseFirst phase
It occurs during winter season when air
temperatures are below freezing for sustained
periods of time
FROST HEAVE: Heave means the lifting of the
surface of soil due to expansion of subgrade by
absorption of water in clayey soils and formation of
ice between soil grains to a considerable depth.
9. Second phaseSecond phase
►It occurs towards the end of the winter season.It occurs towards the end of the winter season.
►Subsequent increase in temperature would resultSubsequent increase in temperature would result
in melting or thawing of the frozen ice crystalsin melting or thawing of the frozen ice crystals
and softens the road bed.and softens the road bed.
10. ContCont....
►FROST BOILFROST BOIL:: If the pavement is of a flexibleIf the pavement is of a flexible
and traffic is allowed to use the road while theand traffic is allowed to use the road while the
subgrade is in this condition,the wheels ofsubgrade is in this condition,the wheels of
vehicles easily break through the pavement andvehicles easily break through the pavement and
churn up the softy soupy layers of soilchurn up the softy soupy layers of soil
immediately below.immediately below.
11. BASIC CONDITIONS FOR GROWTH OF ICEBASIC CONDITIONS FOR GROWTH OF ICE
LAYERSLAYERS
The ice layers or lenses which causes highway andThe ice layers or lenses which causes highway and
airport surfaces to heave, grow in the soil inairport surfaces to heave, grow in the soil in
essentially the following manner…essentially the following manner…
The frost line penetrates downwards, small volumesThe frost line penetrates downwards, small volumes
of water in the soil pores freeze.of water in the soil pores freeze.
This action, in effect,dries the soil in the region of theThis action, in effect,dries the soil in the region of the
ice formation,because the frozen water is no longerice formation,because the frozen water is no longer
available to satisfy the attraction of the soil foravailable to satisfy the attraction of the soil for
capillary water..capillary water..
Since drying a soil decreases its matric potential,Since drying a soil decreases its matric potential,
water from below where the potential is greater,tendswater from below where the potential is greater,tends
to flow upward towards this new created region ofto flow upward towards this new created region of
low potentiallow potential..
12. ContCont....
This water also freezes when it reaches the frost line.This water also freezes when it reaches the frost line.
As it freezes, the newly formed ice attaches to theAs it freezes, the newly formed ice attaches to the
originally minute ice particles, causing them to increaseoriginally minute ice particles, causing them to increase
in thickness in the downward direction.in thickness in the downward direction.
Thus the heave producing ice layers grow, being fed byThus the heave producing ice layers grow, being fed by
capillary water from below and process continues.capillary water from below and process continues.
The sum of the thickness of all the ice layers that formThe sum of the thickness of all the ice layers that form
is the amount by which the surface heaves.is the amount by which the surface heaves.
13. Three basic conditions must exist inThree basic conditions must exist in
order for ice layers to form and grow inorder for ice layers to form and grow in
thicknessthickness
►Freezing temperatures in the soil.Freezing temperatures in the soil.
►A reservoir of ground water sufficiently close toA reservoir of ground water sufficiently close to
the frost line to feed the growing ice layers.the frost line to feed the growing ice layers.
►Soil material having favourable characteristicsSoil material having favourable characteristics
for rapid movement of capillary water upwardfor rapid movement of capillary water upward
from the water table.from the water table.
14. FACTORS INFLUENCING FROST ACTIONFACTORS INFLUENCING FROST ACTION
Frost susceptible soilFrost susceptible soil
Depressed temperature below freezing pointDepressed temperature below freezing point
Supply of waterSupply of water
covercover
15. EFFECTS OF FROST ACTIONEFFECTS OF FROST ACTION
►Frost heave:raising in pavement surfaceFrost heave:raising in pavement surface
►Frost melting and thawing: decrease in loadFrost melting and thawing: decrease in load
carrying capacity of sub grade soil.carrying capacity of sub grade soil.
►Causes undulations and considerable damages toCauses undulations and considerable damages to
the pavement.the pavement.
16. DEPTH OF FROST PENETRATIONDEPTH OF FROST PENETRATION
►The performance of pavements in frost affectedThe performance of pavements in frost affected
regions depends to a large degree on the depth ofregions depends to a large degree on the depth of
frost penetration.frost penetration.
►Prediction of the max depth of frost can bePrediction of the max depth of frost can be
accomplished in several ways, includingaccomplished in several ways, including
correlation of field penetration data withcorrelation of field penetration data with
temperature data and theoritical formulas andtemperature data and theoritical formulas and
charts.charts.
17. CONTCONT....
►Several formulas have been presented forSeveral formulas have been presented for
predicting depth of frost penetration.predicting depth of frost penetration.
►STEFAN’S EQUATION:It is derived bySTEFAN’S EQUATION:It is derived by
equating the fundamental equation of heat flowequating the fundamental equation of heat flow
and storage.and storage.
►ASSUMPTION: Only heat flow that need to beASSUMPTION: Only heat flow that need to be
considered is that represented by the latest heatconsidered is that represented by the latest heat
of fusion of the soil water, time T is converted toof fusion of the soil water, time T is converted to
days.days.
18. ContCont....
►Z=Z= 48KF
L
WHERE,WHERE,Z= DEPTH OF PENETRATION IN A HOMOGENOUS MASS(ft)Z= DEPTH OF PENETRATION IN A HOMOGENOUS MASS(ft)
K=thermal conductivity(Btu’s/ square foot/ degree F, per foot. Per hr)K=thermal conductivity(Btu’s/ square foot/ degree F, per foot. Per hr)
F=degree daysF=degree days
L=volumetric heat of latest fusion(Btu’s/ cubic foot)L=volumetric heat of latest fusion(Btu’s/ cubic foot)
19. Objections to silty soilsObjections to silty soils
The poorest soils from the stand point of frostThe poorest soils from the stand point of frost
damage are the soils that are frost prone those aredamage are the soils that are frost prone those are
sufficiently fine grained (to exert moderately highsufficiently fine grained (to exert moderately high
capillary forces tending to lift water above a watercapillary forces tending to lift water above a water
table).table).
Sufficiently coarse grained (to have a high rate ofSufficiently coarse grained (to have a high rate of
capillary conductivity)capillary conductivity)
Soil of this kind will transmit relatively largeSoil of this kind will transmit relatively large
quantities of water in a relatively short time to feedquantities of water in a relatively short time to feed
growing ice lenses.growing ice lenses.
Uniformly graded soils that contain >10% of particlesUniformly graded soils that contain >10% of particles
smaller than 0.02mm and fairly well graded soilssmaller than 0.02mm and fairly well graded soils
containing more than 3% of this size should becontaining more than 3% of this size should be
looked upon with suspicion whenever encountered inlooked upon with suspicion whenever encountered in
a soil survey.a soil survey.
20. Measures to prevent frost actionMeasures to prevent frost action
►Installation of proper surface and sub surfaceInstallation of proper surface and sub surface
drainage system.drainage system.
►Construction of layers of pavement upto theConstruction of layers of pavement upto the
desired depth.desired depth.
►Using granular and non frost susceptibleUsing granular and non frost susceptible
material to resist adverse climatic conditions.material to resist adverse climatic conditions.
►Providing the suitable capillary cut offProviding the suitable capillary cut off
►By soil stabilizationBy soil stabilization