Geotechnical Engineering

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vivek gami
vivek gami

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Which type of soil is present in desert?

  1. nikeetasharma

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    Most of the desert soils are called Aridisols.

    Most of the desert soils are called Aridisols.

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vivek gami
vivek gami

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What is different between Prandtal mixing length and Boundarylayer ?

  1. Vivek Patel

    Vivek Patel

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    Prandtl mixing line theory is the phenomenon of momentum remaining constant in fluid flow where the boundary layer is a theory of variations of velocity perpendicular to the floor and velocity value change from 0 to infinite. Prandtl mixing theory is used for the study of momentum in fluid flow. BouRead more

    Prandtl mixing line theory is the phenomenon of momentum remaining constant in fluid flow where the boundary layer is a theory of variations of velocity perpendicular to the floor and velocity value change from 0 to infinite.

    Prandtl mixing theory is used for the study of momentum in fluid flow.

    Boundary layer theory is used for the study of velocity distributions in fluid flow.

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Dhanya
Dhanya

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What is the bearing capacity of soil? How can we calculate it?

  1. CB Sowmya

    CB Sowmya

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    With the previous answer, I would like to add the following. Bearing capacity plays a major role in the foundation design of a structure. Bearing capacity (kN/sq.m) is the maximum load that the soil can take per unit area without failure, displacement, or yielding. Bearing capacity depends on the soRead more

    With the previous answer, I would like to add the following.

    Bearing capacity plays a major role in the foundation design of a structure. Bearing capacity (kN/sq.m) is the maximum load that the soil can take per unit area without failure, displacement, or yielding. Bearing capacity depends on the soils structure, density, permeability, porosity, and shear strength. Mostly, based on the bearing capacity, we arrive at the type and dimensions on the footing,

    The tests have already been included in the answer by Vivek Patel.

    To know more about, bearing capacity of soils,

    https://test.theconstructor.org/geotechnical/bearing-capacity-of-soil-calculation/11996/

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Pat Macko
Pat Macko

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Hello, I’m currently studying for my FE Civil exam and going over Geotech material. When classifying soils using USCS, after you’ve determined the soil is a fine-grained soil, how can you know if the soil is organic or inorganic?

  1. Kuldeep Singh

    Kuldeep Singh

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    There are a few parameters that you can use to judge whether a soil is organic or inorganic. Organic soils have fairly lower bulk densities than inorganic soils (0.2 to 0.3 as compared to 1.2 to 1.5). Organic soils will feel significantly lighter. Organic soils can retain way more water than inorganRead more

    There are a few parameters that you can use to judge whether a soil is organic or inorganic.

    Organic soils have fairly lower bulk densities than inorganic soils (0.2 to 0.3 as compared to 1.2 to 1.5). Organic soils will feel significantly lighter.

    Organic soils can retain way more water than inorganic soils (in proportions if their own densities).

    The color of organic soils is usually darker than inorganic soils. But this is not a good parameter for comparison since the color is affected by other things as well apart from organic nature.

    Cation exchange capacity (CEC) is higher in organic soils (4 times as that of inorganic soils). This means that organic soils will have a lower pH, higher exchangeable hydrogen, more calcium and magnesium ions, and higher exchangeable calcium content.

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aviratdhodare
aviratdhodare

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As the consolidation process continues, water will be expelled out. Why is the degree of saturation of soil treated as constant throughout the consolidation process?

  1. nikeetasharma

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    The degree of saturation denotes the actual relationship between the weight of moisture existing in a space and the weight that would exist if the space were saturated. It can be also said as the percentage of water that occupies the pore spaces present in soil and is said to be degree of saturationRead more

    The degree of saturation denotes the actual relationship between the weight of moisture existing in a space and the weight that would exist if the space were saturated.

    It can be also said as the percentage of water that occupies the pore spaces present in soil and is said to be degree of saturation. Basically, the soil has three phases soil solid, water and air. If the pore and void space in the soil is fully occupied by water, then it is fully saturated and the degree of saturation is 100%. If the void space in the soil is partially occupied by water, then it is said to be partially saturated.

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Manas Ranjan Patra
Manas Ranjan Patra

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  What is the submerged density and degree of shrinkage?

  1. Kuldeep Singh

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    Kuldeep Singh Learner

    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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Vinnarasan
Vinnarasan

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Why we conduct soil penetration test in soil investigation?

  1. AdityaBhandakkar

    AdityaBhandakkar

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    Why we Conduct the SPT Test in Soil investigation?

    As a civil engineer to check the geotechnical properties of soil, three guests must be performed the shear test, bearing test, and penetration test. A penetration test is performed by three methods, standard penetration test A dynamic cone penetration test Cone penetration test or Dutch cone penetraRead more

    As a civil engineer to check the geotechnical properties of soil, three guests must be performed the shear test, bearing test, and penetration test.

    A penetration test is performed by three methods,

    1. standard penetration test
    2. A dynamic cone penetration test
    3. Cone penetration test or Dutch cone penetration test.

    In Geotechnical engineering, the value of standard penetration test is widely used for determining technical properties of soil.

    1. To check the soil parameters
    2. Value of cohesion and angle of internal friction with imperial relations.
    3. To know the deformation modulus.
    4. To check the consistency of soil
    5. For determining the bearing capacity of soil

    This test is globally used to determine various engineering and geotechnical properties for soil investigations.

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Asked: In:
vivek gami
vivek gami

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What is Supersaturated in Soil?

  1. Vivek Patel

    Vivek Patel

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    Basically in soil there is 3 part Solids partical Air Water When water added to soil, at that time soil become saturated. And when air contain replace by water and soil become fully saturated at that time soil have two part one is water and one is solid partical.   If we add more water than fulRead more

    Basically in soil there is 3 part

    1. Solids partical
    2. Air
    3. Water

    When water added to soil, at that time soil become saturated. And when air contain replace by water and soil become fully saturated at that time soil have two part one is water and one is solid partical.

     

    If we add more water than fully saturation, hence saturation of soil is 100% or more than that, is called the supersaturated stage.

    Water content more than shrinkage limit called supersaturated stage

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