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A layer of sand extends from ground level to a depth of 9 m and overlies...

A layer of sand extends from ground level to a depth of 9 m and overlies a layer of clay, of very low permeability, 6 m thick. The water table is 6 m below the surface of the sand. The saturated unit weight of the sand is 19 kN/m3 and that of the clay 20 kN/m3; the unit weight of the sand above the water table is 16 kN/m3. Over a short period of time the water table rises by 3 m and is expected to remain permanently at this new level. Determine the effective vertical stress at depths of 8 and 12 m below ground level:

a) immediately after the rise of the water table

b) several years after the rise of the water table.

Engineering   Civil-Engineering   
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Answer #1

The effective stress at 8 and 12 m below ground lever after rise of water table and after several years are to be determined.

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