Direction: The ground conditions at a site are as shown in the figure. The water table at the site which was initially at a depth of 5 m below the ground level got permanently lowered to a depth of 15 m below the ground level due to pumping of water over a few years. Assume the following data (i) unit weight of water = 10 kN/m3 .
(ii) unit weight of sand above water table = 18 kN/m3 .
(iii) unit weight of sand and clay below the water tabl = 20 kN/m3 .
(iv) coefficient of volume comprehensibility = 0.25 m2 /MN.
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What is the compression of the clay layer in mm due to the lowering of the water table?
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- 125
- 100
- 25
- 0
Correct Option: A
Coeff. of volume comprehensibility,
| = | ∆σ1 |
Here changes in the height.
| ∴ | = | |||
| V0 | H0 |
| = | = mv.∆σ' × H0 | V0 |
| = | × | × 5000 = 125 mm | ||
| 106 | 106 |
