A soil profile consists of a 6 m thick layer of medium dense sand over 20 m of loose silty sand and gravel over 15 m of dense sand. The total unit weights of the three soil strata are 19.5 kN/m³, 18.6 kN/m³, and 21.4 kN/m³, respectively. The water table is at a depth of 4 m below the ground surface. Assume that the total unit weight of the upper medium dense sand layer is the same above and below the water table. a) Sketch the soil profile showing the water levels, soil strata, etc. b) Find the total stress (0), pore water pressure (u), and effective stress (ơ') at 5 m, 15 m, and 35 m. At 5m: 0= kN/m² kN/m? o'= kN/m? u= At 15m: 0= kN/m? kN/m? o'= kN/m? u= At 35m: 0= kN/m? kN/m? o'= kN/m? u=

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For a site, there is a layer of sand, 5.3m thick, that lies over a clay layer of 1.2m. The water table is 1.3m below the ground surface. The saturated unit weights of the sand and clay are 21.6 kN/m3 and 18.8 kN/m3, respectively. The unit weight of sand above the water table is 17.2 kN/m3. Determine the total vertical stress, porewater pressure and effective vertical stress at the bottom of each layer. Plot the values found in (a) against the depth below ground level. If the water table rises up to an elevation of 0.7 m above the ground level, what will the total vertical stress, pore water pressure and effective vertical stress at the bottom of the clay layer?

A 3m deep sand layer has a specific gravity of 2.68 and a void ratio of O.60. Under this layer is a 2.5m deep clay profile with a specific gravity of 2.7 and a moisture content of 30%. The water table is observed at 1m below the ground surface. Determine the effective soil pressure at the midweight of clay.