Soil Mechanics and Foundation Sheet 36
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1) Question.
Consider the following statements:
1. Increase in volume of a soil sample without external constraints on submergence in water is termed as the 'free sweel
of soil'.
2. Clay soil rich in montmorilonite exhibits very low swelling characteristic.
3. Generally, free swell of soil sample ceases when its water content reaches the plastic limit.
Of these statements
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2) Question.
Consider the following statements:
1. uniformity coefficient greater than 6.
2. coefficient of curvature between 1 and 3
3. effective size greater than 1 mm
Of these statements
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3) Question.
Consider the following statements:
1. Dynamic cone penetration test for site investigation is based on the principlethat elastic shock waves travel in
different materials at different velocities.
2. Electrial resistivity method of subsurface investigation is capable of detecting only the strata having different
electrical resistivity.
3. In-situ vane shear test is useful for determining the strength of very soft soil and sevsitive clays and is unsuitable
for sandy soil.
Of these statements
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4) Question.
A bed of sand consists of three horizontal layers of equal thichness. The value of Darcy's k for the upper and lower layers is and that for the middle layer is . The ratio of the permeability of the bed in the horizontal direction to that in the vertical direction is
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5) Question.
A soil sample is having a specific gravity of 2.60 and a void ratio of 0.78. The water content in percentage required to fully saturate the soil at that void ratio would be
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6) Question.
No tension should develop at the base of the rectangular well foundation or at any horizontal section within the well. For no tension at the base, the resultant of 'Pa' (Total active thrust) and 'W' (Weight of soil and well above the base) must pass through middle
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7) Question.
Efficiency of a pile group is defined as
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8) Question.
Consider the following statements regarding negative skin friction in piles:
1. It is developed when the pile is driven through a recently deposited clay layer.
2. It is developed when the pile is driven through a layer of dense sand.
3. It is developed due to a sudden drawdown of the water table.
Of these statements
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9) Question.
In which one of the following pairs of soil types would ne anticipate negative pore pressure, when subjected to shearing?
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10) Question.
A retaining wall retains a soil backfill. Tension cracks have occurred in the backfill. The total active earth pressure is given by (y = unit weight of soil, H = height of retaining wall, = coefficient of active earth pressure, = cohesion of soil)
Answer.
