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A 20m thick clay layer is sandwiched between a silty sand layer and a gravelly sand layer. The layer experiences 30 mm settlement in 2 years.
Where Tv is the time factor and U is the degree of consolidation in% If the coefficient of consolidation of the layer is 0.003 cm2 /s, the deposit will experience a total of 50 mm settlement in the next ________ years.
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- 1.8
- 0.98
- 2
- 0.608
Correct Option: D
4.43
| Tv = | d2 |
| = | 0.003 × (2 × 86400 × 365) | ||||||
 | × 100 |  | 2 | ||||
| 150 | |||||||
| × u2 = 0.189 | 4 |
⇒ u = 0.49 ≤ 60%
| Consolidation = | = 61.22 mm | 0.49 |
For 50 mm settlement
| u = | = 0.817 = 81.7% | 61.22 |
TV = 1.784 – 0.933 log10(100 – u) = 0.608
| Tv = | = 0.608 | d2 |
