24 kPa 3-m 4.5m 6m Ongnal waer Sand 3 m You 18.88 kN/m Now warer able 3 m 6m Sand and Gravel
A manufacturing plant was constructed on a silty soil 3 m. thick which is underlain by sand and gravel. After many years, after all, water wells and the rate of pumping being made in the area, the water table was lowered from 3 m. below the ground surface to 6 m. below the ground surface. The unit weight of the soil above the water table is 15.74 kN/m3 and below the water table is 18.88 kN/m3. The dry unit weight of the soil below the silty layer when the water table dropped down is 16.21 kN/m3. The compression index is 0.32 and the void ratio of the soil before the water table was lowered was 0.60. The building floor load is 24 kPa.
a) Compute the final stress at A. Ans. 142 kPa
b) Compute the final stress at B. Ans. 145.65 kPa
c) How much is the primary compression as a result of the lowering of the water table? Ans. ____
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