METU Civil Engineering Department CE363 Soil Mechanics 2011-2012 Fall Semester HOMEWORK 2 Due on: Oct 26 Wednesday, 17:401)A layer of clay 4 m thick lies between two layers of sand each 4 m thick, the top of the upper layer of sand being ground surface. The water table is at 2 m below ground surface. The lower sand layer is under artesian pressure, the piezometric water level being at 4 m above ground surface. The saturated unit weight of the clay is 20 kN/m3and that of the sand is 19 kN/m3; and above the water table the unit weight of the sand is 16.5 kN/m3. Draw the total stress, effective stress and pore water pressure diagrams. 2)In a 10-m-thick deposit of fine sand the water table is at 3.5 m below the surface, but sand to a height of 1 m above the water table is saturated by capillary water (above this height the sand may be assumed to be dry). The saturated and dry unit weights, respectively, are 20 kN/m3and 16 kN/m3. Draw the total stress, effective stress and pore water pressure diagrams for this sand layer.
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