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Geotechnical Engineering

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Asked: September 19, 2020In: Geotechnical Engineering

drained and undarined shear strength

mukh159
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what are the difference between drained and undrained shear strength? under what condition drained or undrained shear strength should be used

  1. aviratdhodare

    aviratdhodare

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    Added an answer on October 18, 2020 at 10:37 am

    One very imp decision on the selection of soil strength for design is whether the soil is behaving under drained or undrained loading conditions. Why, bcoz each gives diff strength values and the selection of the wrong trength could lead to disaster. Any soil can experience either condition dependinRead more

    One very imp decision on the selection of soil strength for design is whether the soil is behaving under drained or undrained loading conditions. Why, bcoz each gives diff strength values and the selection of the wrong trength could lead to disaster. Any soil can experience either condition depending on the rate of loading and the permeability of the soil.

    In general, we normally treat coarse-grained soils such as sands and gravels as drained materials bcoz their permeability is high and therefore water can flow freely through the large and continuous void spaces. Fine-grained soils such as silts and clay’s however have much smaller void spaces and often these aren’t continuous so there is no direct route for water to flow freely. You can consider water flow in fine-grained soils is a little like a game of snakes and ladders whether water advances to a certain pt but then as to backtrack as the void spaces come to an abrupt end.

    Thus, the porous nature of soil has a direct influence on soil strength. We can illustrate this by again calling on Mohr circle for 2D stress as many practical problems can be treated by analysis in 2D. Imagine we have a submerged coarse grain material, this means the soil void space is saturated and that we’re going to construct a raft foundation at ground level. Consider a representative element within the bulb of soil influenced by the rafts floating. Before the raft is constructed, the soil element will experience the following vertical & horizontal normal stresses. The Mohr circle for these stresses looks like so,

    Mohr circle diagram with the Mohr-Coulomb-Griffith failure-criterion... |  Download Scientific Diagram

    Diag not exact, only for reference

    notice that the circle is well away from the failure line and this is known as the K0 are at rest condition

    K0 = σ3 / σ1

    If the raft is now constructed, we see that the Mohr circle shifts to the right & increases in diameter. This is bcoz the raft loading increases both the horizontal and vertical normal stresses.

    These increases take place in unison as the load is transferred directly into greater intergranular stresses. Any tendency for the pore water pressure to increase doesn’t materialize as the permeability of the soil permits the water to flow rapidly out of the void space. So the grain settled into a denser & stronger configuration & this is ∴ referred to as the drained or eff stress condition. The eff vertical stress on the soil element changes from the at-rest condn to the follow’g

    σ1 = γsat . z – γw . z

    σ1‘= (γsat . z + ∆σ) – γw . z
    Note again that the Mohr circle at the end of construction remains well away from the line defining failure. Its dist away being a measure of the foundations FOS.

    Now let’s take the exact same scenario but this time for a fine-grained soil. The K0 or in-situ stresses remain essentially the same as before. This time however that the foundation load is applied, the Mohr circle will again shift to the right but its dia remains constant. This occurs bcoz water is incompressible & it takes the additional load from the raft as the low permeability soil prevents the water in the void space from escaping quickly enough. Hence the soil grains are prevented from reconfiguring into a denser stronger structure. The consequence of such behavior can be seen if we test three specimens that are fully saturated have the same moisture content & a similar soil structure. Then the application of an increasing confining pressure in each test will simply mean that the pore water pressure in each specimen is increased by the same amount. No change in eff stress occurs as the pore water carries the additional load & the shear strength measured Cu will be the same irrespective of the confining pressure this gives a ϕu = 0° failure line. Also note that the characteristics of all three specimens in terms of eff stress is represented by the same circle. This is a consequence of the pore water pressure and failure then -‘ed from the initial confining stress for each test.

    This is an imp concept to understand. It’s not that the soil has changed in any way but rather, the loading conditions are such that in the short term. The soil is not free draining & hence its strength is limited by its initial eff stress. In the long term of course, the elevated pore water pressures will dissipate & the stress once carried by the pore water will be transferred into the soil skeleton.

    The lesson here is under undrained loading, saturated fine-grained soils will have a strength limited by their eff stress prior to loading. But in time, assuming the soil has not failed under the loading its strength will increase with transfer of load from the pore water to the soil grains.

    In temperate climates throughout the world. Soils are essentially saturated at foundation level so engineers practicing in such regions would do well to remember this jekyll-and-hyde behavior of fine grained soils. Finally we mentioned earlier that as soil is loaded the strength increases as its grains move into a denser tighter configuration. The price we pay for this closing of void space is settlement or the movement of foundations.

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Asked: July 31, 2020In: Geotechnical Engineering

What are the properties and significance of Fire Clay?

Vivek Patel
Vivek Patel

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What are the properties and significance of Fire Clay?

  1. nikeetasharma

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    Added an answer on October 8, 2020 at 7:31 pm

    Fire clay :- Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a "mineral aggregate composed of hydrous silicates of aluminium (Al2O3·2SiO2·2H2O) with or without fRead more

    Fire clay :-

    Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a “mineral aggregate composed of hydrous silicates of aluminium (Al2O3·2SiO2·2H2O) with or without free silica.”

    Properties of fire clay :-

    Fire clay is resistant to high temperatures, having fusion points higher than 1,600 °C (2,910 °F); therefore it is suitable for lining furnaces, as fire brick, and for manufacture of utensils used in the metalworking industries, such as crucibles, saggars, retorts and glassware. Because of its stability during firing in the kiln, it can be used to make complex items of pottery such as pipes and sanitary ware.

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Asked: July 7, 2020In: Geotechnical Engineering

In which type of soil ‘Floating foundation’ can be used?

Ancy Joby
Ancy Joby

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In which type of soil ‘Floating foundation’ can be used?

  1. nikeetasharma

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    nikeetasharma Guru
    Added an answer on December 18, 2020 at 10:01 pm

    Floating foundation can be used in on high moisture soils.

    Floating foundation can be used in on high moisture soils.

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Asked: September 19, 2020In: Geotechnical Engineering

What is the best method for ground improvement technique?

nikeetasharma
nikeetasharma

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What are the methods for ground improvement technique and which one is the best among them?

  1. nikeetasharma

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    nikeetasharma Guru
    Added an answer on November 26, 2020 at 1:56 pm

    Thank you everyone.

    Thank you everyone.

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Asked: July 20, 2020In: Geotechnical Engineering

What are the method for finding Bearing capacity of soil?

Himanshu joshi
Himanshu joshi

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What are the method for finding Bearing capacity of soil?

  1. nikeetasharma

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    Added an answer on December 15, 2020 at 7:03 pm

    The different methods for finding bearing capacity of soil are as follows :- 1. Presumptive analysis 2. Analytical method 3. Plate bearing test 4. Penetration test 5. Modern testing method 6. Centrifuge test

    The different methods for finding bearing capacity of soil are as follows :-

    1. Presumptive analysis
    2. Analytical method
    3. Plate bearing test
    4. Penetration test
    5. Modern testing method
    6. Centrifuge test

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Asked: September 19, 2020In: Geotechnical Engineering

What is adsorbed water, and how does it affect the permeability of soil?

aviratdhodare
aviratdhodare

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What is adsorbed water, and how does it affect the permeability of soil?

  1. sanjaypakad

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    Added an answer on October 8, 2020 at 5:36 pm

    Adsorbed water The term 'Adsorbed water' as it applies to the area of reclamation can be defined as ' Water in a soil or rock mass, held by physico-chemical forces, having physical properties substantially different from absorbed water or chemically combined water, at the same temperature and pressuRead more

    Adsorbed water

    The term ‘Adsorbed water’ as it applies to the area of reclamation can be defined as ‘ Water in a soil or rock mass, held by physico-chemical forces, having physical properties substantially different from absorbed water or chemically combined water, at the same temperature and pressure’.

    How affects the permeability :

    Fine particles of clay are surrounded by films of adsorbed water. Forces of adsorption and development of diffuse ion-layer around the clay particles create immobilized hydrodynamic layers of water, thereby reducing the effective pore space available for seepage.

     

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Asked: July 24, 2020In: Geotechnical Engineering

What is zero air void line in soil?

Vivek Patel
Vivek Patel

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What is zero air void line in soil?

  1. Abbas Khan Civil Engineer

    Abbas Khan Civil Engineer

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    Added an answer on July 27, 2020 at 3:17 pm

    The zero Air Void line is obtained when there is no presence of the air in the pores of a soil mass and totally filled with the water and soil mass get saturated. It is determined by the compaction test of a soil. Draw the graph between Dry Density VS water content, calculate the dry density from thRead more

    The zero Air Void line is obtained when there is no presence of the air in the pores of a soil mass and totally filled with the water and soil mass get saturated. It is determined by the compaction test of a soil. Draw the graph between Dry Density VS water content, calculate the dry density from the compaction test results, and Zero Air void line is drawn on the graph.

     

    Graph A

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Asked: June 24, 2020In: Geotechnical Engineering

What is Submerged Density and Degree of Shrinkage?

Manas Ranjan Patra
Manas Ranjan Patra

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  What is the submerged density and degree of shrinkage?

  1. Kuldeep Singh

    Kuldeep Singh

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    Added an answer on June 28, 2020 at 10:30 pm

    Submerged density or bouyant density is the density of a mass of soil as observed under water in a saturated condition of course. Suppose you are calculating the density when the soil mass and you yourself are submerged. It is calculated as the difference of the soil density in air and the density oRead more

    Submerged density or bouyant density is the density of a mass of soil as observed under water in a saturated condition of course. Suppose you are calculating the density when the soil mass and you yourself are submerged. It is calculated as the difference of the soil density in air and the density of water, divided by the density of water.

    SD = (density of soil – density of water) / density of water

    or

    SD = density of soil in air – 1

    It is also defined as the mass of soil minus the mass of water displaced by it upon submergence, divided by the volume.

    This concept is particularly useful in determining the bouyancy of submerged soils and is crucial in equations of sediment transport in rivers. If the bouyant density equals 1, the soil just floats. If it gets negative, soil will rise in water.

    Degree of shrinkage is another concept. It is the amount of water content reduction needed to bring the soil to its shrinkage limit, expressed as percent of the original water content.

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