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Unformatted text preview: excavation to keep the excavation stable? (Assume the total head in the sand is constant). 8 m. 3 m. h = ? 7 m. Clay Sand 6 m. sat = 130 pcf sat = 115 pcf 3. A soil profile is shown below. The water table is 30 feet below the ground surface and there is capillary rise in the overlying clay to a height of 20 feet above the groundwater table. Compute and plot the variation in total stress, pore water pressure and effective stress from the ground surface to a depth of 45 feet. Plot depth on the vertical axis, with zero at the top and increasing downward. Plot all three stresses (total pore water and effective) on the same diagram. 10 ft. 20 ft. Dry sand Clay (Zone of capillary rise) 15 ft. n = 0.4, G s = 2.65 e = 0.48, G s = 2.72, S r = 100% e = 0.90, G s = 2.70, S r = 100% Clay...
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