Question: A soil sample, 7 5 mm in diameter and 2 0 mm high was taken from a clay layer 1 1 m thick. It was

A soil sample, 75 mm in diameter and 20 mm high was taken from a clay layer 11 m thick. It was tested in a laboratory oedometer with drainage at top & bottom, and it took 20 minutes to reach 60% consolidation.
a. If the clay layer in the field has the same drainage condition as the laboratory sample, Calculate how long it will take the 10 m clay layer to achieve 50% consolidation.
b. How much more time would it take the 10 m clay layer to achieve 50% consolidation, if it was underlain by rock?

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