Direction: The average effective overburden pressure on 10 m thick homogeneous saturated clay layer is 150 K Pa. Consolidation test on undisturbed soil sample taken from the clay layer showed that the void ratio decreased from 0.6 to 0.5 by increasing the stress intensity from 100 kPa to 200 kPa. (G = 2.65)
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The initial void ratio of the clay layer is
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- 0.209
- 0.563
- 0.764
- 1.00
Correct Option: B
Compression Index,
| Cc = | e0 - e1 | |||
| log10 |  |  | ||
| σ0 | ||||
| = | 0.6 - 0.5 | = 0.209 | ||||
| log10 | | | ||||
| 100 | ||||||
Take the case of e = 0.5 and σ = 300 Cc is constant.
| Cc = | e0 - 0.5 | |||||
| log10 | | | ||||
| 150 | ||||||
| .209= | log10(2) |
∴ e0 = 0.563
