Question

1. A sample, 75 mm in diameter and 20 mm high, taken from a clay layer 10 m thick, was tested in an oedometer with drainage at the upper and lower boundaries. It took the laboratory sample 15 minutes to reach 50% consolidation.

   1. 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% and 90% consolidation.

   2. How much more time would it take the 10 m clay layer to achieve 50% consolidation if

drainage existed on only one boundary?

Answer 1

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