Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Question
Chapter 9, Problem 9.5P
a)
To determine
Find the variation of total stress
b)
To determine
Find the rise of water table to increase the effective stress at point C is equal to
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Question-2:
A soil profile is shown in Figure 2.1. Calculate and plot the variation of total vertical stress, pore pressure and effective vertical stress with depth.
Given the soil profile below, determine the Total Stress, Neutral Stress and Effective Stress at points A, B, C, and D . Plot as well the soil pressure diagram. H1= 1.9m; H2=0.95m; H3=1.9m
A soil profile consisting of three layers is shown in Table and Figure below
i. Calculate the values of σ, u and σʹ at points A, B, C, and D.
ii. Calculate the effective stress at c when water table drops by 1 m (consider γb= 15.5 for layer 2).
iii. Calculate the effective stress at c when water table rises by 1 m above layer 1 due to flooding. (consider γsat= 16.5 for layer 1).
Layer no.
Thickness
Soil parameters
1
H1 = 3.5 m
γd = 15.5 kN/m3
2
H2 = 2.5 m
γsat = 18 kN/m3
3
H3 = 3 m
γsat = 18.5 kN/m3
Chapter 9 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- Refer to Figure 8.13. The magnitude of the line load q is 45 kN/m. Calculate and plot the variation of the vertical stress increase, between the limits of x = 10 m and x = +10 m, given z = 4 m. FIG. 8.13 Line load over the surface of a semiinfinite soil massarrow_forward2) A soil profile consisting of three layers is shown in the Figure. A) Calculate the values of σ, u and σ' at points A,B,C and D if Layer 1: H1=5m, e=0.7, Gs=2.69 Layer 2: H2=8m, e=0.55, Gs=2.7 Layer 3: H3=3m, w=38%, e=1.2 B) What is the change in effective stress at point C if: If the water table drops by 2m? If the water table rises to the surface up to point A? Water level rises 3 m above point A due to flooding?arrow_forwardFor the soil profile shown here, plot the stress distribution diagram including total stress, pore pressure stress and effective 1 m Ya= 18 kN/m³ Dry sand 0.5 m Yd=19 kN/m³ Silty sand Yar 22 kN/m³ 2 m Clayarrow_forward
- Refer to the soil profile shown. Given H1 = 9.89 m., and H2 = 5.80 m. If the ground water table rises by 3.78 meters, determine the change in effective stress (numerical value only, in kPa) at the bottom of the clay layer. Properties of dry sand: Gs = 2.53, e = 0.63. Properties of clay: Gs = 2.75, e = 0.81arrow_forwardRefer to the soil profile shown. Given H1 = 8.42 m., and H2 = 5.21 m. If the ground water table rises by 3 meters, determine the change in effective stress (numerical value only, in kPa) at the bottom of the clay layer. Properties of dry sand: Gs = 2.54, e = 0.61. Properties of clay: Gs = 2.76, e = 0.86. Round off to two decimal places.arrow_forwardConsider the upward flow of water through a layer of sand in a tank as shown in Figure QI(c), For the sand, the following are given: void ratio (e) = 0.52 and specific gravity of solid = 2.67. Determine: (i) Total stress, pore water pressure and effective stress at points A and B (ii) The upward seepage force per unit volume of soil.arrow_forward
- For the soil profile show in figure calculate the total vertical stress pure water pressure and effective vertical stress at depth of 0 m 1.2m 2.5m and 5m and 8m.arrow_forwardFor the soil profile given in Figure Q1: (a) Calculate the total stress, pore water pressure, and effective stressat depth of 4m and 8m. (b)Determine the horizontal effective stress at the depth of 21m if the coefficient of earth pressure at rest is 0.48.arrow_forward11. Consider the downward flow of water through a layer of sand in the tank shown. (see picture below) Void ratio of the soil = 0.52 Specific Gravity = 2.70 Compute the value of h1. (Answer: 0.436) Compute the effective stress at A. (Answer: 17.44 kPa) Compute the effective stress at B. (Answer: 31.98 kPa) Compute the seepage force per unit volume. (Answer: 3.57 kN/m3)arrow_forward
- 6. From the given soil profile, the groundwater table is located 2m below the ground level. (See picture below) Compute the horizontal effective stress at point A. (Answer: 53.36 kPa) Compute the lateral effective stress at point A if the lateral earth pressure coefficient at rest is K0=0.50. (Answer: 26.68 kPa) Compute the lateral total stress at point A. (Answer: 56.11 m)arrow_forwardEvaluate the figure shown and solve what is being asked in the problem with the following given: e = 0.42 G = 2.8 H1 = 0.3 m H2 = 3.3 m h1 = 0.9 m z = 1.2 m a. What is the saturated unit weight of sand in kN/m³? b. Calculate the total stress at point C in kPa. c. Calculate the effective stress at point B in kPa.arrow_forwardFor the layered soil shown in the figure, H1 = 5 m, H2 = 5 m, and H3 = 20 m. The soil densities are ρ1=2040kg/m3, ρ2=1940kg/m3, and ρ3′=1020kg/m3. What is the effective stress at the bottom of soil 3 when h' = 15 meters? CHOICES A. 142.7 kPa B. 150.1 kPa C. 163.8 kPa D. 136.8 kPaarrow_forward
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