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A 6 m thick clay layer undergoes 90% consolidation four times faster under two-way drainage as compared to the - drainage. In an identical clay layer of 15 m thickness, two way drainage will be faster as compared to one-way drainage by
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- 8 times
- 4 times
- 2.5 times
- 2 times
Correct Option: B
Time factor,
| Tv = | d2 |
∴ t ∝ d2
d = H, for single drainage
= H/2 for double drainage
∴ time taken is 1/4 times then single drainage.
