Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.13P
To determine
Find the soil encountered at a depth of 32 m.
Find the relative density of the soil.
Find the friction angle of the soil.
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Students have asked these similar questions
The soil sample in a tri axial test have the following stresses
Cell pressure
25 Кра
34 Кра
Pore stress
Deviator stress
20 Кра
31 Кра
12 Кра
10 Кра
a) Calculate the drained angle of internal friction
b) Find the cohesion of soil
c) What is the angle of failure in shear?
A cylindrical sample of soil having a cohesion of 80 kN/m2 and an angle of internal friction of 20° is subjected to a cell pressure of 100 kN/m2. Determine the angle made by the failure plane with the axis of the sample.
Q4- Results shown in table below were obtained from an Odometer test on specimen of saturated
clay. A layer of this clay 1.9 m thick lies below a 2.0 m depth of sand, the water table being at the
surface. The saturated unit weight of both soils is 18.8 kN/m³. A 2.5 m depth of fill ( 4 x 6 m in
size) has a unit weight of 20.8 kN/m’ is placed on the sand surface. Determine the final settlement
due to consolidation of clay.
Pressure, kN/m² 25
50
100
200
400
200
100
50
Void ratio
1.239 | 1.212
1.136
1.059
0.988
1.00
1.010
1.221
Chapter 12 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Consolidated drained triaxial tests on two specimens of a soil gave the following results: Determine the values of c and ? for the soil. Test no. Confining pressure 03 (kN/m²) Deviator stress at failure Aof (kN/m²) 1 70 440.4 2 92 474.7arrow_forward1. A Sample of Clay is isotropically normally consolidated to a cell pressure of 350kPa. The sample was then sheared (standard) in a drained state. Calculate values of q, p', and v at failure if the soil constants were: M=0.88, N=2.88, T=2.76, and λ=0.16arrow_forward3. A civil engineer is interested in assessing the variation of shear strength of clay layers in a site of interest for different depths. After completing CU triaxial tests, the sample mean for the clay shear strength 40 kPa and the standard deviation was 15.5 kPa are obtained for the depth of 3 m from ground surface. For the following conditions: a. Calculate 99% CI for the population mean μ. Write down your interpretation.b. Explain why the size of CI changed between parts a - c.arrow_forward
- A constant-head test was conducted on a sample of soil 15 cm long and 60 cm^2 in cross-sectional area. The quantity of water collected was 50 cm^3 in 20 seconds under a head difference of 24 cm. if the porosity of the sand is 55 % calculate the seepage velocity in cm/s. a. 1.0 x 10^-1 b. 4.3 x 10^-3 c. 3.47 x 10^-2 d. 2.6 x 10^-6arrow_forwardGeotechnical Engineering The following are the results of a standard penetration test in sand. Estimate the soil friction angle at the 3.0 meter depths given N60 =7 . Note that the water table was not observed within a depth of 12 m below the ground surface. Assume that the average unit weight of sand is 15.5 kN/m3 and Pa = 100 kN/m2. a. 44.6 b. 37.6 c. 38.9 d. 34.4arrow_forwardA soil profile is shown in Figure P3.2 along with the standard penetration numbers in the clay layer. Use Eqs. (3.8) and (3.9) to determine the variation of cu and OCR with depth. What is the average value of cu and OCR?arrow_forward
- Subject: Soil Mechanics Please provide a solution and diagram An undisturbed soil sample, 100 mm in diameter and 200 mm high, was tested in a triaxial machine. The sample failed at an additional axial load of 3 kN with a vertical deformation of 20 mm. The failure plane was inclined at 50° to the horizontal and the cell pressure was 300 kN/m2, Determine, from Mohr’s circle, the cohesion in kPa. a. 125.6 b. 117.8 c. 91.3 d. 87.2arrow_forwardA soil sample has a maximum void ratio of 0.75 and minimum void ratio of 0.35. it was also found out that the porosity is 23%, moisture content is 12% and Gs=2.75. compute the dry unit weight of the sample.a. 17.53 kN/m3 c. 19.86 kN/m3 b. 20.77 kN/m3 d. 16.45 kN/m3 A soil sample having a mass of 6.4 kg has a total volume of 0.0052m3. it has moisture content of 24% and specific gravity of solid soils of 2.66. compute the degree of saturation.a. 29% c. 38%b. 35% d. 46% A soil sample having a mass of 3.75kg has a total volume of 0.005m3. it has moisture content of 28% and specific gravity of solid soils of 2.71. compute the void ratio.a. 0.238 c. 0.189b. 0.387 d. 0.834arrow_forward4. For a variable head permeability test, the following are given: 2. A borehole at a site reveals the soil profile shown. Assume Gs = 2.70 for all soil types. Length of soil specimen 200 mm Area of soil specimen a. What is the unit weight of the soil in layer 1 in kN/m³? 1000 mm? Area of standpipe b. What is the effective stress at a depth of 2m below the ground surface, in kPa? 40 mm? Head difference at time t = 0 c. What is the effective stress at a depth of 20.6m below the ground surface, in kPa? 500 mm Head difference at time t = 3 min 300 mm Elevation (m) Continuous supply Very fine wet sand with silt w = 5%, S = 40% Layer 1 2.0 Fine sand saturated by capillary action Layer 2 3.0 500 mm - Fine sand, w = 12% Layer 3 5.4 300 mm -Area of stand pipe. = 40 mm2 L=200 mm icimple -Porous plate Soft blue clay, w = 28% Layer 4 Area of soil sámple = 1000 mm? a. Compute the hydraulic conductivity of the soil in cm/sec. b. Compute the seepage velocity if the porosity of soil is 0.25. 20.6 c.…arrow_forward
- A soil sample has a maximum void ratio of 0.95 and minimum void ratio of 0.55. It was also found out that the porosity is 25%, moisture content is 16% and Gs = 2.65. Compute the dry unit weight of the sample.a. 16.45 kN/m^3b. 17.53 kN/m^3c. 19.50 kN/m^3d. 20.02 kN/m^3arrow_forwardThree samples of loose sand were tested under consolidated undrained (CU) conditions. The failure stresses and excess pore water pressure for the soil sample is given below: Cell Pressure = 243 kPa Deviator Stress = 127 kPa Pore Water Pressure = 82 kPa Determine the drained angle of inclination of failure plane in degrees. Round off to two decimal places. Answer: 53.22arrow_forwardSubject: Soil Mechanics Please provide a solution and diagram Boreholes reveal that a thin layer of alluvial silt exists at a depth of 50 ft below the surface of the ground. The soil above this level has an average dry unit weight of 96 lb/ft3 and an average water content of 30%. The water table is approximately at the surface. Tests on undisturbed samples give the following data: cu = 1008 lb/ft2, undrained friction angle = 13°, cd = 861 lb/ft2, drained friction angle = 23°. Estimate the shearing resistance in psf of the silt on a horizontal plane when the shear stress builds up slowly a. 3120 b. 861 c. 2185 d. 2449arrow_forward
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