The thiclcness of the normally consolidated soft clay layer is 6 m. The natural water content is 31 percent. The specific gravity of the soil being 2.68 with a liquid limit of 41 percent. The saturated unit weight of clay being 17.5 kN/m³. The ground water table is at the surface of the clay. Determine the settlement of the foundation if the centre of the clay layer is subjected to an increase of vertical stress intensity of 8 kNlm³.