A layer of sand, 4m thick, overlies a layer of low permeability clay, 5m thick. The bulk unit weight of the sand is 16.5 kN/m3 and its saturated unit weight is 18 kN/m3 . The saturated unit weight of the clay is 21 kN/m3 . The water table exists initially at 1.0m below ground level but pumping will permanently and rapidly lower the water table to 3.0m below ground level. Determine the variation of total stress and porewater pressure at depth h in the clay and the long-term variation in effective stress. Calculate the initial (before pumping) and the long-term (after pumping) effective stress at the middle of the clay layer.
A layer of sand, 4m thick, overlies a layer of low permeability clay, 5m thick. The bulk unit weight of the sand is 16.5 kN/m3 and its saturated unit weight is 18 kN/m3 . The saturated unit weight of the clay is 21 kN/m3 . The water table exists initially at 1.0m below ground level but pumping will permanently and rapidly lower the water table to 3.0m below ground level. Determine the variation of total stress and porewater pressure at depth h in the clay and the long-term variation in effective stress. Calculate the initial (before pumping) and the long-term (after pumping) effective stress at the middle of the clay layer.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
A layer of sand, 4m thick, overlies a layer of low permeability clay, 5m
thick. The bulk unit weight of the sand is 16.5 kN/m3 and its saturated
unit weight is 18 kN/m3 . The saturated unit weight of the clay is 21
kN/m3 . The water table exists initially at 1.0m below ground level but
pumping will permanently and rapidly lower the water table to 3.0m
below ground level.
Determine the variation of total stress and porewater pressure at depth
h in the clay and the long-term variation in effective stress.
Calculate the initial (before pumping) and the long-term (after
pumping) effective stress at the middle of the clay layer.
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