A 2 m × 3 m spread footing placed at a depth of 2 m carries a vertical load of 3000 kN and a moment of 300 kN ∙ m, as shown in Figure P6.14. Determine the factor of safety using Meyerhof’s effective area method.

Figure P6.14. 

3000 kN 300 kN-m Clayey sand y = 18.5 kN/m3 c' = 5.0 kN/m? d'= 32 2 m 2 m