14 ft 12 ft 20 ft Potential shear surface A
A
a). Compute the effective shear strength at Point A along this surface when the groundwater
table is at level B, then compute the new shear strength if the groundwater table rises to level C. The unit weight of the soil is 120 lb/ft3 above the groundwater table and 123 lb/ft3 below
b). If the shear stress at point A is 2000 psf, what are the factors of safety against sliding at water level B and C?
Hint: use effective stress and assume the failure surface at point A is horizontal.
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