A strip footing, 5 m wide, is founded on the surface of a deep deposit of clay. The undrained shear strength of the clay increases linearly from 3 kPa at the surface to 10kPa at a depth of 5m. Use the limit equilibrium method to estimate the vertical ultimate load assuming that the load is applied at an eccentricity of 0.5 m right from the centre of the footing's width and assuming a circular failure surface.(Bearing Capacity of Shallow Foundations)