Soil mechanics miscellaneous

Soil mechanics miscellaneous

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Soil Mechanics

Soil mechanics miscellaneous
  1. Sieve analysis on a dry soil sample of mass 1000 g showed that 980 g and 270 g of soil pass through 4.75 mm and 0.075 mm sieve, respectively. The liquid limit and plastic limits of the soil fraction passing through 425 m sieves are 40% and 18% respectively. The soil may be classified as








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    Plasticity Index, PI = WC – Wp.
    = 40 – 18 = 22%
    ∵ PI is > 17, soil is highly plastic i.e. clayey soil.
    Since, 98% of soil pass through 4.75 mm sieve and 27% through .075 mm sieve, majority of soil lies between 0.075 and 4.75 mm i.e., sand.
    ∴ Soil is clayey sand (SC)

    Correct Option: A

    Plasticity Index, PI = WC – Wp.
    = 40 – 18 = 22%
    ∵ PI is > 17, soil is highly plastic i.e. clayey soil.
    Since, 98% of soil pass through 4.75 mm sieve and 27% through .075 mm sieve, majority of soil lies between 0.075 and 4.75 mm i.e., sand.
    ∴ Soil is clayey sand (SC)

  1. The laboratory test results of a soil sample are given below:
    Percentage finer than 4.75 mm = 60
    Percentage finer than 0.075 mm = 30
    Liquid Limit = 35%
    Plastic Limit = 27%
    The soil classification is








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    Since more than 50% (60%) pass through 4.75 mm it is not gravel and sieve len them 50% (30%) pan through 0.075 mm it is not silt or clay.
    So it may be sand.
    Moreover, PI = WL – WP = 35 – 27 = 8% (PI < 17)
    ∴ It is sand.
    ∴ it is SM.

    Correct Option: B

    Since more than 50% (60%) pass through 4.75 mm it is not gravel and sieve len them 50% (30%) pan through 0.075 mm it is not silt or clay.
    So it may be sand.
    Moreover, PI = WL – WP = 35 – 27 = 8% (PI < 17)
    ∴ It is sand.
    ∴ it is SM.

  1. A saturates soil mass has a total density 22 kN/m3 and a water content of 10%. The bulk density and dry density of this soil are








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    For saturated soil,
    γbulk = γsat = 22 kN/m3

    γd =
    γ
    1 + w

    =
    22
    		= 20 kN/m3
    1 + 0.1

    Correct Option: B

    For saturated soil,
    γbulk = γsat = 22 kN/m3

    γd =
    γ
    1 + w

    =
    22
    		= 20 kN/m3
    1 + 0.1

  1. As per the Indian Standard soil classification system, a sample of silty clay with liquid limit of 40% and plasticity index of 28% is classified as








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    Since, wL is between 35 and 50. It is ‘intermediate’ soil (CI or MI).
    Since PI is greater than 17 it is clayey soil
    ∴ The soil is CI

    Correct Option: B

    Since, wL is between 35 and 50. It is ‘intermediate’ soil (CI or MI).
    Since PI is greater than 17 it is clayey soil
    ∴ The soil is CI

  1. An open ended steel barrel of 1 m height and 1 m diameter is filled with saturated fine sand having coefficient of permeability of 10–2 m/s. The barrel stands on a saturated bed of gravel. The time required for the water level in the barrel to drop by 0.75 m is








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    k = 10–2 m/s i.e., water travels 10–2 in 1 second.
    ∴ Time taken by water level to drop by 0.75 m

    =
    0.75 m
    		= 75 s
    10–2 m/s

    Correct Option: B

    k = 10–2 m/s i.e., water travels 10–2 in 1 second.
    ∴ Time taken by water level to drop by 0.75 m

    =
    0.75 m
    		= 75 s
    10–2 m/s