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GATE CE: Soil Mechanics & Foundation Engineering Champion Quiz 3

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Question 1

Which of following statement is NOT true in the context of capillary pressure in soils?

Question 2

Compression index developed by Casagrande is

Question 3

What does the confining pressure used in tri-axial compression tests on an undisturbed soil sample represent?

Question 4

A weir on a permeable foundation with downstream sheet pile is shown in the figure below. The exit gradient as per Khosla’s method is

Question 5

A differential free swell test on a soil gives a value of differential free swell of 40%. What is the degree of swelling?

Question 6

For the soil strata shown in figure, the water table is lowered by drainage by 2m and if the top 2m thick silty sand stratum remains saturated by capillary action even after lowering of water table, the increase in effective vertical pressure in kPa at mid–hight of clay layer will be

Question 7

A direct shear test was conducted on a cohesionless soil (c = 0) specimen under a normal stress of 200 kN/m². The specimen failed at a shear stress of 100 kN/m². The angle of internal friction of the soil (degrees) is (round off to 1st decimal place)

Question 8

In a braced vertical excavation of 5 m height and 2.20 m width in a cohesive soil having undrained cohesion equal to 20 kN/m² and bulk unit weight of 20 kN/m³, what is the factor fo safety against heave failure at its base?

Question 9

When a vertical face excavation was made in a clayey silt, having density of 20 kN/m³, it failed at a depth of excavation of 4 m. what is the cohesive strength (in kN/m²) of the soil, if its angle of internal friction was 30^o?

Question 10

A clay layer 3 m deep is sandwiched by a pervious material. The soil reaches 90% consolidation in 3 years. At another site, the same clay layer is bounded by impervious boundary at the bottom and sand at the top. What is the time taken by this layer to reach 90% settlement?

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ESE & GATE CE Foundation Engineering

Dec 13ESE & GATE CE