A 2.0 m wide continuous foundation is placed at 1.5 m depth in a saturated clay where

Question:

A 2.0 m wide continuous foundation is placed at 1.5 m depth in a saturated clay where c_u = 40 kN/m² and γ = 18.5 kN/m³. At 2.0 m below the ground level, this clay layer is underlain by a stiffer clay where c_u = 60 kN/m² and γ = 19.0 kN/m³. What would be the maximum wall load allowed with FS = 3? Use Eq. (7.11).

Eq. (7.11).