A foundation 2.02.0m is located at a depth of 4.0m in a stiff clay of saturated

Question

A foundation 2.02.0m is located at a depth of 4.0m in a stiff clay of saturated unit weight 21 kN/m3. The undrained shear strength at a depth of 4.0m is given by the characteristic parameter cu ¼ 120 kN/m2 (u ¼ 0). The foundation supports a permanent load of 1200kN and a variable load of 700kN. Is the foundation satisfactory with respect to the bearing resistance limit state? What is the factor of safety with respect to shear strength? A foundation 2.02.0m is located at a depth of 4.0m in a stiff clay of saturated unit weight 21 kN/m3. The undrained shear strength at a depth of 4.0m is given by the characteristic parameter cu ¼ 120 kN/m2 (u ¼ 0). The foundation supports a permanent load of 1200kN and a variable load of 700kN. Is the foundation satisfactory with respect to the bearing resistance limit state? What is the factor of safety with respect to shear strength?

Explanation / Answer

The design should be checked for the drained condition using parameters c0 and 0.

In the permissible stress method unfactored loads are used, hence the net foundation

pressure is

qn ¼ 1900

22

ð21 4Þ ¼ 391 kN=m2

The net ultimate bearing capacity is

qnf ¼ 120 8:4 ¼ 1008kN=m2

The factor of safety is 1008/391 ¼ 2:58.

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