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Geotechnical Engineering

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Asked: August 2, 2020In: Geotechnical Engineering

What is disturbed and undisturbed soil sample?

vivek gami
vivek gami

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What is disturbed and undisturbed soil sample?

  1. nikeetasharma

    nikeetasharma

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    nikeetasharma Guru
    Added an answer on December 21, 2020 at 9:25 am

    Disturbed soil sample is one in which the structure of the soil has been changed sufficiently that tests of the structural properties of the soil will not be representatives of in-situ conditions, and only properties of soil grains can be accurately determined. Undisturbed soil sample is one where tRead more

    Disturbed soil sample is one in which the structure of the soil has been changed sufficiently that tests of the structural properties of the soil will not be representatives of in-situ conditions, and only properties of soil grains can be accurately determined.

    Undisturbed soil sample is one where the condition of the soil in the sample is close enough to the conditions of the soil in in-situ to allow tests of structural properties of the soil to be used to approximate the properties of the soil in-situ.

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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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    Abbas Khan Civil Engineer Learner
    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: October 12, 2020In: Geotechnical Engineering

What are the Methods of Interpolation of Contours?

ISMAEL PUNGA
ISMAEL PUNGA

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What are the Methods of Interpolation of Contours?

  1. nikeetasharma

    nikeetasharma

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    nikeetasharma Guru
    Added an answer on October 14, 2020 at 6:36 pm

    Interpolation of the contours is the process of spacing the contours proportionately between the plotted ground points established by indirect methods. The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform. Methods of interpolation of conRead more

    Interpolation of the contours is the process of spacing the contours proportionately between the plotted ground points established by indirect methods. The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform.

    Methods of interpolation of contour are as follows :-

    1. Arithmetic calculation
    2. Graphical calculation
    3. Estimation calculation

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Asked: July 16, 2020In: Geotechnical Engineering

Explain the construction & use of New Mark’s influence chart?

DevilAVRT
DevilAVRT

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Explain the construction & use of New Mark’s influence chart?

  1. Suyogmuralkar

    Suyogmuralkar

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    Added an answer on August 21, 2020 at 1:30 pm

    Hi devilart, This method is used to compute the vertical and horizontal stresses of any shape ,irregular geometry below any point outside or inside The chart as shown in the above figure essentially consists of n no. of radial lines and m no. of concentric circles.   To find out vertical stressRead more

    Hi devilart, This method is used to compute the vertical and horizontal stresses of any shape ,irregular geometry below any point outside or inside

    The chart as shown in the above figure essentially consists of n no. of radial lines and m no. of concentric circles.

     

    To find out vertical stress at any point below or outside the loaded area, Plan of the loaded area is drawn such that depth Z at which stress is being computed equals the length AB as shown on

    N = No. of blocks. Bina Nusantara.

    Further, the plan is placed over influence chart such that the point below which stress is required coincides with the center of chart Then count the number of influence area (N) covered by the plan

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Asked: July 16, 2020In: Geotechnical Engineering

Which best material for backfill of retaining wall?

Vivek Patel
Vivek Patel

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Which best material for backfill of retaining wall?

  1. nikeetasharma

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    Added an answer on October 1, 2020 at 7:28 pm

    Thus when it comes to backfill, it refers to the dirt behind the wall. In order to provide proper drainage, atleast 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall. Compacted native soil can be used to backfill the rest of the space behindRead more

    Thus when it comes to backfill, it refers to the dirt behind the wall. In order to provide proper drainage, atleast 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall. Compacted native soil can be used to backfill the rest of the space behind the wall.

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Asked: September 19, 2020In: Geotechnical Engineering

What is the equation of A-line in the plasticity chart?

aviratdhodare
aviratdhodare

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aviratdhodare

What is the equation of A-line in the plasticity chart?

  1. nikeetasharma

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    Added an answer on November 26, 2020 at 12:09 pm

    Fine grained soils are classified based on the plasticity chart. The equation of A line is ; Ip=0.73(liquid limit -20) Ip=plasticity index

    Fine grained soils are classified based on the plasticity chart. The equation of A line is ;

    Ip=0.73(liquid limit -20)

    Ip=plasticity index

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Asked: September 5, 2020In: Geotechnical Engineering

What is negative pore water pressure in soil?

aviratdhodare
aviratdhodare

aviratdhodare

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What is negative pore water pressure in soil?

  1. sanjaypakad

    sanjaypakad

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

    The pressure is zero when the soil voids are filled with air, and is negative when the voids are partly filled with water (in which case surface-tension forces operate to achieve a suction effect and the shear strength of the soil is increased).

    The pressure is zero when the soil voids are filled with air, and is negative when the voids are partly filled with water (in which case surface-tension forces operate to achieve a suction effect and the shear strength of the soil is increased).

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Asked: May 20, 2021In: Geotechnical Engineering

What is the Safe Bearing Capacity values for Different Soils?

Gopal Mishra
Gopal Mishra

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In the absence of test data for calculating SBC of soil. What are the assumed safe bearing capacity values for different soils?

  1. Fasi Ur Rahman

    Fasi Ur Rahman

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    Fasi Ur Rahman
    Added an answer on May 20, 2021 at 5:40 am

    The capacity of the soil to allow the loads coming from the foundation is called the bearing capacity of the soil. It is essential to know the bearing capacity of the soil before designing the foundation. Different field tests can determine it. However, standard safe bearing capacity values are avaiRead more

    The capacity of the soil to allow the loads coming from the foundation is called the bearing capacity of the soil.
    It is essential to know the bearing capacity of the soil before designing the foundation. Different field tests can determine it. However, standard safe bearing capacity values are available for different soil types, and these values can be assumed where test data is limited or speedy construction is required.

    S.No Type of Soil Safe Bearing Capacity ( kN/m2)
    Cohesive Soils
    1. Soft shale, hard or stiff clay in a deep bed, dry state 440
    2. Medium clay readily indented with a thumbnail 245
    3. Moist clay and Sand clay mixture, which can be indented by thumb pressure 150
    4. Black cotton soil/expansive clay ( 50% saturated) in the dry state 130 to 160
    5. Soft clay indented with moderate thumb pressure 100
    6. Very soft clay which can be penetrated with the thump up to few centimeters 50
    Cohesionless Soil
    7. Compact gravel/sand and gravel mixture with good resistance against penetration of tools 440
    8. Compact and dry coarse sand 440
    9. Compact and dry medium sand 245
    10. Loose gravel or sandy gravel mixture, dry state 245
    11. Fine sand and silt ( consists of dry lumps) 150
    12. Loose and dry fine sand 100
    Rocks
    13. Hard rocks such as granite trap, diorite, etc. 3240
    14. Laminated rocks such as sandstone, limestone, etc. 1620
    15. Residual deposits of shattered and broken bedrock and hard shale cemented material 880
    16. Soft rocks 440
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