Redo Problem 7.6 using Vesic’s (1975) solution [Eq. (7.12)]. 7.8 A 2 m wide continuous foundation is placed at 1 m depth within a 1.5 m thick sand layer that is underlain by a weaker clay layer. The soil properties are as follows: Upper sand layer: unit weight 5 18.0 kN/m3 , f9 5 388 Lower clay layer: unit weight 5 19.0 kN/m3 , undrained shear strength 5 25 kN/m2 Determine the maximum wall load that can be allowed on the foundation with FS 5 3.