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Situation 1. A clay layer 12ft 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 /ft and of the clay layer is 117 Ib /ft³. 1. Compute the total vertical pressure at the mid height of the clay layer. a. 4390psf b. 4577 psf c. 4963psf d. 4800psf 2. Compute the pore water pressure at the mid height of the dlay layer. a. 2659psf b. 2620 psf c. 2668 psf d. 2680psf 3. Compute the effective vertical pressure at the mid height of the clay layer. a. 1731psf b. 1955 psf c. 2295psf d. 1273psf

Situation 1. A clay layer 12ft 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 /ft and of the clay layer is 117 Ib /ft³. 1. Compute the total vertical pressure at the mid height of the clay layer. a. 4390psf b. 4577 psf c. 4963psf d. 4800psf 2. Compute the pore water pressure at the mid height of the dlay layer. a. 2659psf b. 2620 psf c. 2668 psf d. 2680psf 3. Compute the effective vertical pressure at the mid height of the clay layer. a. 1731psf b. 1955 psf c. 2295psf d. 1273psf

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Situation 1. A clay layer 12ft 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 /ft° and of the clay layer is 117 Ib /ft³. 1. Compute the total vertical pressure at the mid height of the clay layer. a. 4390psf b. 4577 psf c. 4963psf d. 4800psf 2. Compute the pore water pressure at the mid height of the clay layer. a. 2659psf b. 2620 psf c. 2668 psf d. 2680psf 3. Compute the effective vertical pressure at the mid height of the clay layer. a. 1731psf b. 1953 psf c. 2295psf d. 1273psf
Transcribed Image Text:Situation 1. A clay layer 12ft 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 /ft° and of the clay layer is 117 Ib /ft³. 1. Compute the total vertical pressure at the mid height of the clay layer. a. 4390psf b. 4577 psf c. 4963psf d. 4800psf 2. Compute the pore water pressure at the mid height of the clay layer. a. 2659psf b. 2620 psf c. 2668 psf d. 2680psf 3. Compute the effective vertical pressure at the mid height of the clay layer. a. 1731psf b. 1953 psf c. 2295psf d. 1273psf
Situation 2. A dense silt layer has the following properties. void ratio = 0.30 eff. Diameter D10 = 10µm capillary constant (c)=0.20 cm² Ground water level is 8.0m below the ground surface. 4. Calculate the height of capillary rise in the silt. b. 7.67m a.6.67 m c. 6.07m d. 7.17m 5. Calculate the vertical effective stress in kpa at 5m depth, assume y, = 26.5 kn/m²and that the soil above the capillary action rise and ground surface is partially saturated at 50%. b. 144.31kpa а. 141.13 kра с. 174.41кра d. 154.1kpa 6. Calculate the effective vertical stress at 10m depth assuming y, = 26.5 kn/m²and that the soil above the capillary action rise and ground surface is partially saturated at 50%. а. 205.28 kpa b. 206.82kpa с. 502.8kpa d. 200.58kpa
Transcribed Image Text:Situation 2. A dense silt layer has the following properties. void ratio = 0.30 eff. Diameter D10 = 10µm capillary constant (c)=0.20 cm² Ground water level is 8.0m below the ground surface. 4. Calculate the height of capillary rise in the silt. b. 7.67m a.6.67 m c. 6.07m d. 7.17m 5. Calculate the vertical effective stress in kpa at 5m depth, assume y, = 26.5 kn/m²and that the soil above the capillary action rise and ground surface is partially saturated at 50%. b. 144.31kpa а. 141.13 kра с. 174.41кра d. 154.1kpa 6. Calculate the effective vertical stress at 10m depth assuming y, = 26.5 kn/m²and that the soil above the capillary action rise and ground surface is partially saturated at 50%. а. 205.28 kpa b. 206.82kpa с. 502.8kpa d. 200.58kpa
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