Problem 2.A clay layer thick rests beneath a deposit of submerged sand 26ft thick. The top of the sand is located 10ft below the surface of a lake. The saturated unit weight of the sand is 125 Ib /fte and of the clay layer is 117 lb /ft. 1. Compute the total vertical pressure at the mid height of the clay layer. 2. Compute the pore water pressure at the mid height of the clay layer. 3. Compute the effective vertical pressure at the mid height of the clay layer.

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
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Chapter9: Consolidation
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Problem 2. A clay layer thick rests beneath a deposit of submerged sand 26ft thick. The top of the sand is
located 10ft below the surface of a lake. The saturated unit weight of the sand is 125 lb /fe and of the clay
layer is 117 lb /ft.
1. Compute the total vertical pressure at the mid height of the clay layer.
2. Compute the pore water pressure at the mid height of the clay layer.
3. Compute the effective vertical pressure at the mid height of the clay layer.
Problem 3.A 4m thick of clay is overlain by 4m thick of sand. The ground water table is 1m below the
natural grade line. Clay and sand have saturated unit weights of 19.5 and 17.3 kn/m respectively. Sand
above the water retains water content of 30%. LL and void ratio of clay are respectively 60% and 27.3%.
Specific gravity of sand solid is 2.7.
1. Find the compression index.
2. Find the moist unit weight of sand above the water table.
3. Find the effective soil pressure at mid clay layer.
Transcribed Image Text:Problem 2. A clay layer thick rests beneath a deposit of submerged sand 26ft thick. The top of the sand is located 10ft below the surface of a lake. The saturated unit weight of the sand is 125 lb /fe and of the clay layer is 117 lb /ft. 1. Compute the total vertical pressure at the mid height of the clay layer. 2. Compute the pore water pressure at the mid height of the clay layer. 3. Compute the effective vertical pressure at the mid height of the clay layer. Problem 3.A 4m thick of clay is overlain by 4m thick of sand. The ground water table is 1m below the natural grade line. Clay and sand have saturated unit weights of 19.5 and 17.3 kn/m respectively. Sand above the water retains water content of 30%. LL and void ratio of clay are respectively 60% and 27.3%. Specific gravity of sand solid is 2.7. 1. Find the compression index. 2. Find the moist unit weight of sand above the water table. 3. Find the effective soil pressure at mid clay layer.
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