A square footing is to be provided in order to support a 350-kip column loading. If the footing is to be located on the surface of a cohesionless soil deposit, what size foundation is required? The...

A square footing is to be provided in order to support a 350-kip column loading. If the footing is to be located on the surface of a cohesionless soil deposit, what size foundation is required? The soil has a unit weight of 125 pcf, and the angle of internal friction is 36°. The rigidity index for the soil zone near the ground surface is 100. It is expected that the water table could rise to the ground surface. For the design, apply a factor of safety of 3 to the extended bearing capacity equation.