Question 5.3: The water table in a deep deposit of very fine sand is 2.3 m...
The water table in a deep deposit of very fine sand is 2.3 m (7.5 ft) below the ground surface. Above the water table, the sand is saturated by capillary water. The unit weight of the saturated sand is 2.0 gm/cm^{3} (124.8 pcf). What is the effective vertical pressure on a horizontal plane at a depth 4 m (13.1 ft) below the ground surface?
\sigma =\gamma H = \left(2.0 g/cm^{3} \right)\left(4.0 m\right) \left(100^{3} cm^{3}/m^{3} \right) \left(1 kg/1000 g\right) =8000 kg/m^{2}
u=\left(1.0 g/cm^{3} \right)\left(1.7 m\right) \left(100^{3} cm^{3}/m^{3} \right) \left(1 kg/1000 g\right) =1700 kg/m^{2}
\sigma ^{′} =\sigma – u =8000- 1700=6300 kg/m^{2}
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