If the water level in Ex. 5.5 remains unchanged and an excavation is made by dredging, what depth of clay must be removed to reduce the effective pressure at point A at a depth of 37 ft by 1000 lb / ft ^{2}? (Fig. Ex. 5.5)
Question 5.6: If the water level in Ex. 5.5 remains unchanged and an excav...
As in Ex. 5.5, \gamma_{b}=47.41 lb / ft ^{3}, let the depth of excavation be D. The effective depth over the point A is (37 – D) ft. The depth of D must be such which gives an effective pressure of (1754-1000) 1 b / ft ^{3}=754 lb / ft ^{2}
or (37-D) \times 47.41=754
or D=\frac{37 \times 47.41-754}{47.41}=21.1 ft
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