GATE CE 2021 Paper 2 — page 19

Questions 55–57 of 65. Imported answers require review unless explicitly marked reviewed.

The soil profile at a road construction site is as shown in figure (not to scale). A large embankment is to be constructed at the site. The ground water table (GWT) is located at the surface of the clay layer, and the capillary rise in the sandy soil is negligible. The effective stress at the middle of the clay layer after the application of the embankment loading is 180 kN/m

. Take unit weight of water,

kN/m

Diagram for Civil Engineering question 45

The primary consolidation settlement (in m, round off to two decimal places) of the clay layer resulting from this loading will be

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Numerically integrate,

from lower limit

to upper limit

. Use Trapezoidal rule with five equal subdivisions. The value (in units, round off to two decimal places) obtained is

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The void ratio of a clay soil sample M decreased from 0.575 to 0.510 when the applied pressure is increased from 120 kPa to 180 kPa. For the same increment in pressure, the void ratio of another clay soil sample N decreases from 0.600 to 0.550. If the ratio of hydraulic conductivity of sample M to sample N is 0.125, then the ratio of coefficient of consolidation of sample M to sample N (round off to three decimal places) is

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2021 · Paper 2

Question 45

Question 46

Question 47