A circular footing is resting on a stiff saturated clay with unconfin…

Question

A circular footing is resting on a stiff saturated clay with unconfined compressive strength is $250\text{ kN/m}^2$. The depth of foundation is 2m. Determine the diameter of the footing if the column load is $600\text{ kN}$. Assume a factor of safety as 2.5. The bulk unit weight of soil is $20\text{kN/m}^3$.