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GATE2021 Geotech. Rapid Quiz 1 (App update required to attempt this test)

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Question 1

Dupuit’s assumptions are valid for

Question 2

The curves A, B & C are stress strain curves for
100%

Question 3

Two identical soil specimens were tested in a triaxial apparatus. 1st specimen failed at a deviator stress of 770 kN/m2, when confining pressure was 200 kN/m2, 2nd specimen failed at a deviator stress of under a confining pressure of 400 kN/m2.
If the same soil is tested in a direct shear test apparatus and the normal stress is Then the shear stress at failure is?

Question 4

For a field pumping test, a well was sunk through a horizontal stratum of sand 14.5 m thick and underlain by a clay stratum. Two observation wells were sunk at horizontal distance of 16 m and 34 m respectively from the pumping well. The initial position of water table was 2.2 m below ground level. At a steady state pumping rate of 925 l/min, the drawdowns in the observation wells were found to be 2.45 m and 1.20 m respectively. The coefficient of permeability of the sand is _______ × 10–2 cm/sec.

Question 5

A sand layer having water content 25% and specific gravity of soil solids 2.67. The water table is at ground level. Unit weight of water 10 kN/m3. The saturation unit weight of the sand is_________ kN/m3.

Question 6

For the soil strata shown in figure, the water table is lowered by drained by 3m and if the top 3m thick sand stratum remains saturated by capillary action even after lowering of water table.

The increase in effective vertical pressure (in kPa) at mid-height of clay layer will be _______.


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Dec 16ESE & GATE CE