Question: Undrained soil sample 3 0 m m thick got 5 0 % consolidation in 2 0 minutes with drainage allowed at top and bottom in

Undrained soil sample 30mm thick got 50% consolidation in 20 minutes with drainage allowed at top and bottom in the laboratory. If the clay layer from which the sample was obtained is 3m thick in field condition, estimate the time it will take to consolidate 50% with (i) double surface drainage (ii) single surface drainage, if in both cases, consolidation pressure is uniform.
Undrained soil sample 3 0 m m thick got 5 0 %

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