Principles Of Foundation Engineering 9e
9th Edition
ISBN: 9781337705035
Author: Das, Braja M.
Publisher: Cengage,
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Chapter 2, Problem 2.11P
To determine
Find the void ratio and unit weight of the soil.
Find the effective stress, total stress, and pore water pressure at the 5 m depth into the bottom of the lake.
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Question 20
A soil profile consists of sand (5-m thick) which overlies a layer of clay (9-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer?
For sand layer: Void Ratio = 0.82, Specific gravity = 2.68, Degree of Saturation = 0.6
For clay layer: Void Ratio = 0.92, Specific gravity = 2.86
Round off to two decimal places.
A soil profile of sand (7m thick) which overlies a layer of clay (8m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in effective stress (in kpa) at the bottom of the layer?
for sand layer:
void ratio = 0.81, specific gravity = 2.74, degree of saturation = 0.65
for the clay layer:
void ratio = 0.85, specific gravity = 2.85
A soil profile consists of sand (5-m thick) which overlies a layer of clay (4-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer?
For sand layer: Void Ratio = 0.82, Specific gravity = 2.75, Degree of Saturation = 0.76
For clay layer: Void Ratio = 1.09, Specific gravity = 2.76
Chapter 2 Solutions
Principles Of Foundation Engineering 9e
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- A soil profile consists of sand (7-m thick) which overlies a layer of clay (9-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.75, Specific gravity = 2.62, Degree of Saturation = 0.77 For clay layer: Void Ratio = 0.87, Specific gravity = 2.85 Round off to two decimal places.arrow_forwardThe soil profile shown consists of dry sand (5-m thick) which overlies a layer of clay (8-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water taable rises to the top of the ground surface, what is the change in effective stress (kpa) at the bottom of the clay layer? For sand layer: Void Ratio= 0.83 SG= 2.68 Degree of Saturation= 0.78 For claylayer: Void Ratio= 0.89 SG=2.88arrow_forwardA layer of soil has the following properties: void ratio = 0.44, effective diameter = 12 μm, capillary constant C = 0.18 cm2 . Groundwater table is 10 m below the ground surface. (a) Find the height of capillary rise in the soil in mm. (b) What is the effective stress in kPa at 7 m depth if unit weight of solids is 25.55 kN/m3 and soil above the capillary zone is 40 % saturated? (c) What is the effective stress in kPa at 14 m depth?arrow_forward
- The soil profile shown consists of dry sand (4-m thick) which overlies a layer of clay (3-m thick). Ground water table is located at the interface of the sand and clay. a. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? Round off to two decimal places. (ANSWER: 26.336) b. Compute the effective stress at the bottom of the clay layer in kPa. Round off to three decimal places (ANSWER: 97.686) c. How many meters must the ground water table rise to decrease the effective stress by 14 kPa, at the bottom of the clay layer? Round off to two decimal places (ANSWER: 2.13)arrow_forwardA soil profile consists of sand (6-m thick) which overlies a layer of clay (5-m thick). The groundwater table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.72, Specific gravity = 2.61, Degree of Saturation = 0.6 For clay layer: Void Ratio = 0.99, Specific gravity = 2.72 Round off to two decimal places.arrow_forwardConsider the upward flow of water through a layer of sand in a tank as shown in the figure below. The void ratio of the sand is e=0.52 and the specific gravity of solids is 2.67. Calculate the total stress, pore water pressure, and effective stress at points A and B. What is the upward seepage force per unit volume of soil?arrow_forward
- Solve the following problems. Provide complete solutions and summary of answers. The water table in soil deposit is 2 meters below the ground surface. The soil above the water table has a dry unit weight of 14.85 kN/cu. Meter. The saturated unit weight of the soil is 20.58 kN/cu.meter. Determine the following: a. Total Stress at a point 4.80 meters below the ground b. Total Pore pressure 4.80 meters below the ground c. Total effective stress at a point 4.80 meters below the ground.arrow_forwardneed fast please A soil profile consists of sand (6-m thick) which overlies a layer of clay (6-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.88, Specific gravity = 2.75, Degree of Saturation = 0.79 For clay layer: Void Ratio = 0.99, Specific gravity = 2.86 Round off to two decimal places.arrow_forwardThe soil profile consists of 5m sand underlain by 13 m layer of clay. The ground water table is at a depth 2.8 m below the surface. The sand has a unit weight of 19 kN per cu. Meter above the ground water table and the saturated unit weight below was 20 kN per cu. meter. The saturated unit weight of the clay is 15.7 kN per cu. meter. At a depth of 11 m determine the following:a. Total stressb. Pore water pressurec. Effective stress.....arrow_forward
- Calculate the value of the effetive stress at the bottom of the given soil.arrow_forwardRefer to the soil profile shown in Figure 6.25. Given H1 = 4 meter and H2 = 3 meter. If the ground water table rises to 2 meter below the ground surface,what will be the net change in effective stress at the bottom of the claylayer?arrow_forwardThe depth of water in a lake is 4 m. The soil at the bottom of thelake consists of sandy clay. The water content of the soil wasdetermined to be 25.0%. The specific gravity of the soil grainsis 2.70. Determine the void ratio and the unit weight of the soil.What would be the total stress, effective stress, and pore waterpressure at the 5 m depth into the bottom of the lake?arrow_forward
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