Question

A raft foundation 60 m x 40 m carrying a net pressure of 145 KN/m² is located at a depth of 4.5 m below the surface in a deposit of dense sandy gravel 22 m deep: the water table is at a depth of 7 m. Below the sandy gravel is a layer of clay 5 m thick which, in turn, is underlain by dense sand. The value of m_v for the clay is 0.22 m²/MN. Determine the settlement below the centre of the raft, the corner of the raft and the centre of each edge of the raft, due to consolidation of the clay.

Answer 1