Target GATE & ESE 2022 (Geotechnical Engineering-II)

Q.1 A and B are Skempton's pore pressure coefficients. For saturated normally consolidated soils

 (a)  A>1 and  B>1                        (b)  A>1 and B<1

 (c)  A<1  and B>1                        (d)  A< 1 and B=1

Q.2 Consider the following statements:

 1. Pore pressure parameter A is a constant for a soil.

 2. The shear strength of soil is a function of the effective stress in the soil and not of the total stress in the soil.

Which of the statements given above is/are correct

(a) 1 only                                  (b) 2 only

(c) Both 1 and 2                       (d) Neither 1 nor 2

Q.3 Consider the following statements:

1. Brittle behavior of soils can be obtained when soil is heavily over-consolidated clay.

2. For a saturated soil Skempton's B-parameter is nearly equal to unity.

3. In UCS test minor principal stress equal to zero.

Which of these statements is/are correct

(a) 1,2 and 3             (b) 2 and 3             (c) 1 only        (d) 3 only

Q.4 In an unconsolidated undrained triaxial test it is observed that an increase in cell pressure from 150 kPa to 250 kPa leads to a pore pressure increase of 80 kPa. It is further observed that an increase of 50 kPa in deviatoric stress results in an increase of 25 kPa in the pore pressure. The value of Skempton's pore pressure parameter B is:

(a) 0.5                                           (b) 0.625

(c) 0.80                                         (d)   1.0

Q.5 A clay soil sample is tested in a triaxial apparatus in consolidated drained conditions at a cell pressure of 100 kN/m^2. What will be the pore water pressure at a deviator stress of 40 kN/m^2?

 (a) 0                                          (b) 20 kN/m^2

 (c) 40 kN/m^2                          (d) 60 kN/m^2