A layer of clay 4m thick lies between two layers of sand each 4m thick, the top of the upper layer of sand being ground level. The water table is 2 m below ground level but the lower layer of sand is under artesian pressure, the piezo- metric surface being 4m above ground level. The saturated unit weight of the clay is 20 kN/m and that of the sand 19KN/m'; above the water table the unit weight of the sand is 16.5 kN/m³. Calculate the effective vertical stresses at the top and bottom of the clay layer.
A layer of clay 4m thick lies between two layers of sand each 4m thick, the top of the upper layer of sand being ground level. The water table is 2 m below ground level but the lower layer of sand is under artesian pressure, the piezo- metric surface being 4m above ground level. The saturated unit weight of the clay is 20 kN/m and that of the sand 19KN/m'; above the water table the unit weight of the sand is 16.5 kN/m³. Calculate the effective vertical stresses at the top and bottom of the clay layer.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:3.3 A layer of clay 4 m thick lies between two layers of sand each 4m thick, the top
of the upper layer of sand being ground level. The water table is 2m below
ground level but the lower layer of sand is under artesian pressure, the piezo-
metric surface being 4m above ground level. The saturated unit weight of the
clay is 20 kN/m and that of the sand 19kN/m'; above the water table the unit
weight of the sand is 16.5 kN/m³. Calculate the effective vertical stresses at the
top and bottom of the clay layer.
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