Soil Mechanics and Foundation Sheet 37
-
1) Question.
Consider the following statements regarding under-reamed piles:
1. They are used in expansive soils.
2. They are of pre-cast reinforced concrete.
3. The ratio of bulb to shaft diameters is usually 2 to 3.
4. Minimum spacing between the piles should not be less than 1.5 times the bulb diameter.
Of these statements
Answer. -
2) Question.
A and B are Skempton's pre pressure coefficients. For saturated normally consolidated soils,
Answer. -
3) Question.
If s is the shear strength, c and are shear strength parameters, and is the normal stress at failure, then Coulomb's equation for shear strength of the soil can be represented by
Answer. -
4) Question.
A soil fails under an axial vertical stress of in uncofined compression test. The failure plane makes an angle of with the horizontal. The shear parameters c and respectively will be
Answer. -
5) Question.
Which of the following laboratory triaxial test paramenters should one specify to be carried out in connection with the initial stability of footing on saturated clay?
Answer. -
6) Question.
Consider the following statements in relation to the given sketch:
Weight,g 0.2 Air 0 0.3 Water 0.3
0.5 Answer.7) Question.A deposit of fine sand has a porosity n and specific gravity of soil solids is G. The hydraulic gradient of the deposit to develop boiling condition of sand is given by
Answer.8) Question.A concentrated load of 50 t acts vertically at a point on the soil surface. If Boussinesq's equation is applied for computation of stress, then the ratio of vertical stresses at depths of 3 m and 5 m respectively vertically below the point of application of load will be
Answer.9) Question.Bearing capacity of a soil strata supporting a footing of size 3 m x 3 m will not be affected by the presence of ground water table located at a depth which is
Answer.10) Question.In Newmark's influence chart for stress distribution, there are ten concentric circles and ten radial lines. The influence factor of the chart is
Answer.
