A circular well has an external diameter of 7.5m and is sunk into a s…

Question

A circular well has an external diameter of 7.5m and is sunk into a sandy soil to a depth of 20 m below the maximum scour level. The resultant horizontal force is 1800kN. The well is subjected to a moment of 36000 kN.m about the maximum scour level due to the lateral force. Determine whether the well is safe against lateral forces, assuming $\gamma = 10 \text{ kN/m}^3$ and $\varphi = 36^{\circ}$. Use Terzaghi's analysis, and a factor of safety of 2 against passive resistance.