A5 m-thick clay (Gs = 2.65, water content = 0.28) is overlain by a 4.50m-thick layer of sand (Gs = 2.60, e = 0.70, S = 0.85). The ground water table is located 4.50 m from the ground surface. Compute for the following: 1. At what depth would the vertical effective stress be equal to 120 kPa? 2. What is the vertical efective stress at a depth 9 m below the ground surface? 3. The depth of excavation required to reduce the effective stress at the bottom of the clay layer by 100 kPa. O Question 1: A 1.94 O Question 1:8. 3.99 O Question 1: C. 6.44 O Question 1: D. 8.49 O Question 2. A 168.9 O Question 2 B. 44.1 O Question 2 C. 120.1 O Question 2 D. 124.8 O Question 3 A 183 O Question 3. B. 7.67 O Question 3 C. 3.17 O Question 3 D.633

A5 m-thick clay (Gs = 2.65, water content = 0.28) is overlain by a 4.50m-thick layer of sand (Gs = 2.60, e = 0.70, S = 0.85). The ground water table is located 4.50 m from the ground surface. Compute for the following: 1. At what depth would the vertical effective stress be equal to 120 kPa? 2. What is the vertical efective stress at a depth 9 m below the ground surface? 3. The depth of excavation required to reduce the effective stress at the bottom of the clay layer by 100 kPa. O Question 1: A 1.94 O Question 1:8. 3.99 O Question 1: C. 6.44 O Question 1: D. 8.49 O Question 2. A 168.9 O Question 2 B. 44.1 O Question 2 C. 120.1 O Question 2 D. 124.8 O Question 3 A 183 O Question 3. B. 7.67 O Question 3 C. 3.17 O Question 3 D.633

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter10: Stresses In A Soil Mass

Section: Chapter Questions

Problem 10.19P

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A 5 m-thick clay (Gs = 2.65, water content = 0.28) is overlain by a 4.50m-thick layer of sand (Gs = 2.60, e = 0.70, S = 0.85). The ground water table is located 4.50 m from the ground surface. Compute for the following: 1. At what depth would the vertical effective stress be equal to 120 kPa? 2. What is the vertical effective stress at a depth 9 m below the ground surface? 3. The depth of excavation required to reduce the effective stress at the bottom of the clay layer by 100 kPa. Question 1: A. 1.94 Question 1: B. 3.99 Question 1: C. 6.44 Question 1: D. 8.49 Question 2: A. 168.9 Question 2: B. 44.1 Question 2: C. 120.1 Question 2: D. 124.8 Question 3: A. 1.83 Question 3: B. 7.67 Question 3: C. 3.17 Question 3: D. 6.33
A 5 m-thick clay (Gs = 2.65, water content = 0.28) is overlain by a 4.50m-thick layer of sand (Gs = 2.60, e = 0.70, S = 0.85). The ground water table is located 4.50 m from the ground surface. Compute for the following: 1. At what depth would the vertical effective stress be equal to 120 kPa? 2. What is the vertical effective stress at a depth 9 m below the ground surface? 3. The depth of excavation required to reduce the effective stress at the bottom of the clay layer by 100 kPa.
A 5m thick clay (Gs = 2.65, water content = 0.28) is overlain by a 4.5m thick layer of sand (Gs = 2.60, e = 0.70, S = 0.85). The ground water table is locate 4.5m from the ground surface. 1. at what depth would the vertical effective stress be equal to 120kpa?2. what is the vertical effective stress at a depth 9m below the ground surface? 3. what depth of excavation required to reduce the effective stress at the bottom of the clay layer by 100kpa?
At what depth would total the vertical stress in a deep deposit of clay (e = 1.1, Gs = 2.74) be 100 kPa if the water table is 1 m below the ground surface and the above the water surface a saturation degree of 70 % exists. What is the effective stress at the same depth?
At what depth would total the vertical stress in a deep deposit of clay (e = 1.1, Gs = 2.74)be 100 kPa if the water table is 1 m below the ground surface and the above the watersurface a saturation degree of 90 % exists. What is the effective stress at the same depth?
A flexible circular area of radius 3.3 m. is uniformly loaded by q = 315 kN/m². Determine the increase in vertical stress, 3.5 m. deep at its center.
Effective Stress in Soil Problem 1. The water table in a certain deposit of soil is at a depth of 2m below the ground surface. The soil consists of clay up to depth of 4m from the ground and below which lies sand. The clay soil is saturated even above the water table: Clay strata: ? = 30%,?? = 2.72 Sandy Strata: ? = 26%, ?? = 2.64 1. Compute the total pressure. 2. Compute the pore water pressure. 3. Compute the effective stress pressure at a depth of 8m below the ground surface
A 3 m-thick sand layer is underlain by a deep bed of clay where the water content is 29%. The water table is at the bottom of the sand layer. The unit weight of sand is 18 kN/m3, and Gs for clay grains is 2.70. Find the effective vertical stress at a depth 10 m below the ground level.
A soil profile is shown in Figure Q3(b)(i). The groundwater level is located on the ground surface. The sand layer is under artesian pressure where the excess pore water pressure is 40 kN/m^2. (i) Calculate the total vertical stress, pore water pressure and effective vertical stress at the base of each layer. (ii)Determine the increment of the effective stress at the base of sand layer if the 1.5m height fill will be imposed on the ground surface. Note that, the density of the fill material is 1750 kg/m^3. (iii) The excavation will be made in the clay layer for the basement construction. Evaluate the stability of the soil from boiling or quick condition. The depth of the excavation is shown in Figure Q3(b)(ii). (iv)Propose the maximum depth of cut that can be made to avoid boiling or quick condition.
The water table in an 8 m thick silty sand deposit lies at a depth 3 m below the ground level. The entire soil above the water table is saturated by capillary water and the saturated unit weight is 18.8 kN/m^3 . Calculate the a) total vertical effective stress, b) the porewater pressure, and c) the vertical effective stress at 8 m below the ground level. Express answers in kPa rounded to the first decimal place.
The water table in soil deposit is 2 m below the ground surface. The soil above the water table has dry unit weight of 14.85 kN/m^3. The saturated unit weight of the soil is 20.58 kN/m^3. Determine the total vertical stress, in kPa, at a point 4.8 m below the ground. Determine the total pore water pressure, in kPa, at a point 4.8 m below the ground. Determine the The effective vertical stress, in kPa, at a point 4.8 m below the ground.
Determine the total stress of the dry sand with the dry unit weight, yd is 16.5 kN/m3 at the depth of 6 m.