Question

Q1. A load of 630 kN/m is carried on a strip footing 3 m wide at a depth of 1.5 m in a stiff clay with saturated unit weight 21 kN/m, the water table being at ground level Determine the factor of safety with respect to general shear failure (a) whe105 kN/m, and φ,-0°, (b) when c' = 10 kNm, and = 28。 13.0, 3.5] Q2. A strip footing 2.0 m wide is located at a depth of 1.0 m in a sand of unit weight 18 kN/m', the water table being well below foundation level. The shear strength parameters are c' = 0° and φ' = 38·The footing cames a load of 800 kN/m. Determine the factor of safety with respect to shear failure (a) if the load is vertical, (b) if the load is inclined at 10 to the vertical. For part (a) only, what factor of safety exists when the water table rises to the base of the footing? [4.9, 3.5, 3.3] Q3. Determine the size of a square footing supporting a column load of 700 kN, which is founded at a depth of 1.0 m in a stiff clay, if a factor of safety of 3 with respect to general shear failure is specified. The saturated unit weight of the clay is 18 kN/m3 and the relevant shear strength parameters are cu = 40 kNm' and -00 [2.55 m square] Hint: 1- Solve Q and Q2 using Vesic bearing-capacity equation and Vesic facors. 2- Before calculating the factor of safety, claculate the net ultimate bearing capacity in Ql and Q2.

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Answer 1

b r In nc) toizeghi keay epacity factos dependi on 9-volur cote.tutncafe cd cleyf widm 엄·tuctng beeing capuc{ty (k)independen oy Ihdependent of beth width and depth 3