A 2 m by 2 m square foundation will be used to support an item of machinery weighing 800 kN. The foundation will be placed on the soil surface. Determine the values of preconstruction and...

A 2 m by 2 m square foundation will be used to support an item of machinery weighing 800 kN. The foundation will be placed on the soil surface. Determine the values of preconstruction and postconstruction vertical stress in the soil zone 1.5 m below the base of the foundation, under the center, and under the edge. Soil unit weight is 18 kN/m³.

(a) Assume Boussinesq conditions apply.

(b) Assume Westergaard conditions apply