5 m below the ground surface. As shown in Fig., subsurface exploration has discovered that the site is underlain with sand, except for a uniform and continuous clay layer that is located at a depth of 10 to 12 m below ground surface. Below the groundwater table, the pore water pressures are hydrostatic in the sand layers (i.e., no artesian pressures). The average void ratio e of the clay layer is 1.10 and the buoyant unit weight γ of the clay layer = 7.9 kN/m3 . The total unit weight γ of the sand above the groundwater table = 18.7 kN/m3 and the total unit weight γ of the sand below the groundwater table = 19.7 kN/m3 . A laboratory consolidation test performed on an undisturbed specimen obtained from the center of the clay layer (Point A, Fig) indicates the maximum past pressure σ′ = 100 kPa and the
Yes A site has a level ground surface and a level groundwater table located 5 m below the ground surface. As shown in Fig., subsurface exploration has discovered that the site is underlain with sand, except for a uniform and continuous clay layer that is located at a depth of 10 to 12 m below ground surface. Below the groundwater table, the pore water pressures are hydrostatic in the sand layers (i.e., no artesian pressures). The average void ratio e of the clay layer is 1.10 and the buoyant unit weight γ of the clay layer = 7.9 kN/m3 . The total unit weight γ of the sand above the groundwater table = 18.7 kN/m3 and the total unit weight γ of the sand below the groundwater table = 19.7 kN/m3 . A laboratory consolidation test performed on an undisturbed specimen obtained from the center of the clay layer (Point A, Fig) indicates the maximum past pressure σ′ = 100 kPa and the compression index C = 0.83. Determine the primary consolidation settlement s of the 2 m thick clay layer if a uniform fill surcharge of 50 kPa is applied over a very large area at ground surface
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