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Soil Mechanics Test 8
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  • Question 1/9
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    The load carrying capacity of a square footing of side 1m resting on clay is calculated to be 2000 kPa. The bearing capacity of a footing of width 2m resting on the same soil is
  • Question 2/9
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    A timber pile of dia 60 cm is driven by using a drop hammer of 25 kN weight. The free fall is kept as 1m. The total penetration of the pile measured in the last five blows is 30 mm. The load carrying capacity of the pile using engineering news formula is (in kN up to 2 decimal places)
  • Question 3/9
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    The thickness of the core cutter having area ratio and outer diameter of 17% and 200 mm will be ____mm.
  • Question 4/9
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    A standard penetration test conducted in saturated coarse sandy soil with γsat = 20 kN/m3 at a depth of 6 m yielded a standard penetration value of N = 25. The bulk density of soil above water table is 18 kN/m3. Calculate the corrected value of N value if the water table is at 2.5 m below the ground surface.
  • Question 5/9
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    A rigid square footing of side 2 m is subjected to a column load of 2000 kN.

    Poisson’s ratio of footing = 0.2

    Modulus of elasticity of footing = 25000 kPa

    Poisson’s ratio of soil = 0.25

    Modulus of elasticity of soil = 6000 kPa

    Assume an influence factor of 0.9, the immediate settlement of the footing is
  • Question 6/9
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    A square pile group of 16 piles penetrates through a filled-up soil of 3 m depth. The pile diameter is 250 mm and pile spacing is 0.75 m. The unit cohesion of the material is 18 kN/m2 and the unit weight of soil is 15 kN/m3. Compute the negative skin friction of the group (in kN, up to two decimal places) if the adhesion coefficient of the pile and clayey soil around is 0.4.
  • Question 7/9
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    A circular concrete pile is to be driven in a homogeneous clayey soil having undrained cohesion of 60 KPa and unit weight (γ) = 18 kN/m3. If the length of the pile required to ensure the 650 kN capacity of the pile with a factor of safety of 2.5 is 13 m, then the diameter of the pile required will be ______ m. Assume adhesion factor (α) between clay and pile to be 0.5.
  • Question 8/9
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    Determine the gross safe load as per Terzaghi’s theory that can be carried out by a square footing of 3m size placed at a depth of 1.5 m below ground level. The properties of foundation soil are:

    γt = 16 kN/m3, C = 12 kN/m2, ϕ = 24°

    Assume a factor of safety of 2.5.

    For ϕ = 24° : NC = 17.7, Nq = 17.4, Nγ = 5

    For ϕ = 16.53° : NC = 12.3, Nq = 8.2, Nγ = 2.4

  • Question 9/9
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    A building is to be supported on a R.C.C raft foundation of dimensions 10 m × 15 m at depth of 6 meters. The subsoil is clay which has an average unconfined compressive strength of 15 kN/m2. If the unit weight of the excavated soil is 18 kN/m3, determine the net bearing capacity of the footing if bearing capacity is to be calculated from Skempton’s equation.
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