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1. For the soil profile below, what are the total and effective stresses at depths of 1.0, 1.5, and 2 meters? For the gravel, consider the unit weight of the soil above the water table to be 18 kN/m3, and the soil below the water table to be saturated.
2. Calculate the change in total stress at a depth of 15 meters in a clay layer if the water table is dropped from the surface to a depth of 3 meters. The clay has a water content of 30%, S = 100%, and Gs = 2.70. Consider that no significant change in the degree of saturation or water content occurs when the water table is changed.
3. A deposit of saturated clay in the Yellow Sea has a submerged unit weight of 6.4 kN/m3. The mudline (top of soil) is located 76 meters beneath the ocean surface. Plot the total vertical stress, effective vertical stress, and pore water pressure as a functiㅇn of depth from the mudline to a position 30 meters below the mudline. Assume that the unit weight of sea water is 10 kN/m3.
4. A 12 meter thick layer of gravel overlies bedrock. For the gravel, w = 20%, and Gs = 2.70. The water table is at the ground surface.
a) Plot the vertical effective stress versus depth for the gravel.
b) A wide landfill is slowly constructed at the ground surface. The fill is 3 m thick and has a unit weight of 19 kN/m3. The water table remains at the elevation of the ground surface. Plot the variation in vertical effective stress with depth after fill construction on the same graph as used in part a). Assume that the pore water pressures in the gravel are unaffected by the addition of the fill.
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