A strip footing 2m wide carries a load intensity of 560 kN/m² at a de…

Question

A strip footing 2m wide carries a load intensity of 560 kN/m² at a depth of 1.2 m in sand. The saturated unit weight of sand is 18 kN/m³ and unit weight have water table is 16.8 kN/m³. The shear strength parameters are C=0 and $\phi=35^{\circ}$. Determine the factor of safety with respect to shear failure for the following cases of location of water table.

i) water table 3m below the ground surface

ii) water table is at ground level

iii) water table is 4m below the ground level

iv) water table is 0.5m below ground level