GATE CE 2021: Soil Mechanics & Foundation Engineering#8 (App update required to attempt this test)

which of the following statements are regarding Direct Shear test is/are correct:

1. This test is more suitable for cohesion less soil

2. Failure of the soil sample takes place along the weakest plane

3. Mohr’s circle can not be drawn for stress conditions before failure of the soil sample.

4. This test can be performed for all the three drainage conditions

Which one of the following test on a saturated clay soil gives the unique effective stress Mohr circle?

Stress path equation for triaxial test is q = 7* + 0.5 p. Find the value of unconfined compressive strength of the same sample is? (all values are in MKS unit)

An embankment 6 m high is made of soil having effective stress parameter are c’ = 40 kN/m² and φ’ = 15 and ϒ = 17.2 kN/m³. The triaxial test pore pressure parameters are A = 0.44 and B = 0.9. Calculate the shear strength of the soil (in kN/m²) at base of embankment after the fill has been raised by 3 m. Assume that the dissipation of pore pressure is negligible and at any point lateral pressure can be taken as one third of vertical pressure at that point.

A CU test was conduct on a saturated normally consolidated clay. The sample failed at a deviator stress of 70 kPa when the cell pressure was 100 kPa.

If pore water pressure at failure is 60 kPa, value of angle of internal friction of the soil is:

A consolidated undrained triaxial compression test is conducted on a normally
consolidated clay at a confining pressure of 100 kPa. The deviator stress at failure is 80 kPa, and the pore-water pressure measured at failure is 50 kPa. The effective angle of internal friction (in degrees, up to one decimal place) of the soil is_________