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GATE CE 2020 Geotech. Engg. Quiz 11 (App update required to attempt this test)

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Question 1

What will be the maximum depth(m) of excavation possible with a vertical face in a clay soil which has

and

. (Assume S_n = 0.230 and FOS = 1)

Question 2

A granular soil has a saturated unit weight of 20 kN/m³ and an effective angle of shearing resistance of 30°. The unit weight of water is 9.81 kN/m³. A slope is to be made on this soil deposit in which the seepage occurs parallel to the slope up to the free surface. Under this seepage condition for a factor of safety of 1.5, the safe slope angle (in degree, round off to 1 decimal place) would be ____

Question 3

List-I below gives the possible types of failure for a finite soil slope and List-II gives the reasons for these different types of failure. Match the items in List-I with the items in List-II
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Question 4

A 45 ° slope as shown in figure has been excavated to a depth of 6 m in a saturated clay having the following properties:

Determine the factor of safety.
[Take area of wedge = 39 m²]

Question 5

For two infinite slopes (one in dry condition and other in submerged condition) in a sand deposit having the angle of shearing resistance 30 °, factor of safety was determined as 1.5 (for both slopes). The slope angles would have been

Question 6

The soil profile above the rock surface for a 30 ° infinite is shown in the figure below, where c_u is undrained shear strength and γ_t is total weight of the soil. The depth at which the slip occurs is

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