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oblem (40 points) the soil profile of a site consists of 2m of sand with a saturated unit weight of N/ mand a speci avity of 2.65, overlying 6m of normally consolidated clay with a saturated unit weight of 17 specific gravity of 2.7 and a compression index -0.3. Below this clay layer, a deep sand ists. The water table is at the ground surface. An Unconsolidated Undrained (UU) trivial te rformed on a sample collected from the clay layer. The confining pressure y used in this te kPa and the deviator stress at failure 150kPa. An additional surcharge equivalent to a unit es q=70kN/m' is to be applied to the ground surface. termine: 1) The in situ initial vertical effective stress at the center of the clay layer before the surch application. (5%) 2) The undrained shear strength of the clay. (10%) 3) The initial in situ void ratio of the clay layer before the application of the surcharge. (S 4) The final void ratio after the surcharge has been applied and all excess pore water pre have dissipated. (at the end of the consolidation) (20%)