An 800 kN column load will be supported on a square spread footing foundation bearing on the surface of a cohesionless soil deposit. The soil has a unit weight of 20 kN/m 3 and an angle of internal...

An 800 kN column load will be supported on a square spread footing foundation bearing on the surface of a cohesionless soil deposit. The soil has a unit weight of 20 kN/m³
and an angle of internal friction of 34°. The rigidity index for the affected soil zone is 75. Assume that the groundwater table is very deep. Determine the required size footing, using the extended bearing capacity equation with a factor of safety of 3.