Question

A new foundation will be built on a 2.5m thick clay layer. The current effective stress in the middle of the clay layer was found to be 200 kPa. During construction, the foundation area will be heavily loaded with the structure and equipment so that effective stress at the middle of the clay layer will be increased to 800 kPa. After construction is completed, which will take 5 years, the equipment will be removed and the final effective stress in the middle of the clay layer will be 650 kPa. Determine final thickness of the clay layer after the primary consolidation due to the equipment removal is done (hint: don't worry about secondary consolidation after equipment is removed). Lab results for a clay specimen: Initial vold ratio Preconsolidation stress Compression index Swelling index Secondary compression index 0.287 1.08 150 kPa 0.465 0.078 Coefficient of consolidation1.855 mly Drainage Double

Answer 1

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