MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 1 term (6 months)
9th Edition
ISBN: 9781305971226
Author: Braja M. Das; Khaled Sobhan
Publisher: Cengage Learning US
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Chapter 12, Problem 12.16P
To determine
Find the shear strength parameters of the soil.
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A sand sample in a triaxial test have the following stresses:
Cell Pressure
25kpa
34kpa
Axial Stress
33kpa
55kpa
Pore Water pressure
12kpa
10kpa
a. Compute the drained angle of internal friction.
b. Determine the cohesion of the soil
c. Find the angle of failure in shear
A sample of dry sand is subjected to a triaxial test. The
angle of internal friction is 36°. If the cell pressure is 180
kN/m2, at what value of deviator stress will the soil fail?
Include fbd.
A series of previous tests has established that the ultimate effective friction angle
of a NC clayey soil is 19.2°.
If a CD test is now performed on this soil with a cell pressure of 105 kPa, what
would be deviator stress at failure?
Given: o3 = Kao, where Ka
1-sin o'
1+sin o'
Chapter 12 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 1 term (6 months)
Ch. 12 - Prob. 12.1PCh. 12 - Prob. 12.2PCh. 12 - Prob. 12.3PCh. 12 - Prob. 12.4PCh. 12 - Prob. 12.5PCh. 12 - Prob. 12.6PCh. 12 - Prob. 12.7PCh. 12 - Prob. 12.8PCh. 12 - Prob. 12.9PCh. 12 - Prob. 12.10P
Ch. 12 - Prob. 12.11PCh. 12 - Prob. 12.12PCh. 12 - Prob. 12.13PCh. 12 - Following are the results of...Ch. 12 - Prob. 12.15PCh. 12 - Prob. 12.16PCh. 12 - Prob. 12.17PCh. 12 - Prob. 12.18PCh. 12 - Prob. 12.19PCh. 12 - Prob. 12.20PCh. 12 - Prob. 12.21PCh. 12 - Prob. 12.22PCh. 12 - Prob. 12.23PCh. 12 - Prob. 12.24PCh. 12 - Prob. 12.1CTP
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- A cohesionless soil sample is subjected to a triaxial test. The critical state friction angle of the soil is 28 degrees and the normal effective at the failure is 200 kPa. Determine the critical state shear stress. Determine the plunger stress. Determine the cell pressure.arrow_forwardA sample of dry sand is tested in direct shear. The shear box holding the sample has a circular cross section with a diameter of 50 mm. The normal (compressive) load imposed is 205 N. The sample shear when the shear force is 125 N.a) Determine the test normal stress and shear stress at failure.b) Determine the angle of internal friction Φ for this soilc) What is probable condition of the tested sample (dense, loose, etc)?arrow_forwardA sample of dry sand is tested in direct shear. The shear box holding the sample has a circular cross section with a diameter of 50 mm. The normal (compressive) load imposed is 210 N. The sample shear when the shear force is 135 N. a) Determine the test normal stress and shear stress at failure. b) Determine the angle of internal friction O for this soil c) What is probable condition of the tested sample (dense, loose, etc)?arrow_forward
- A sample of dry sand is tested in direct shear. The shear box holding the sample has a circular cross section with a diameter of 50 mm. The normal(compressive) load imposed is 200 N. The sample shears when the shear force is 130 N.(a) Determine the test normal stress and shear stress at failure.(b) Determine the angle of internal friction f for this soil.(c) What is the probable condition of the tested sample (dense, loose, etc.)?arrow_forwardA consolidated-undrained tri-axial test was conducted on a normally conslidated clay sample and the results are follows: Chamber confining pressure= 119kpa Deviator Stress at failure=90 kpa Pore water pressure= 58kpa These results were used to determine the drained friction angle of the soil. Compute the deviator stress (kpa) at failure when the drained test was conducted with the chamber confining pressure changed to 156 kpa. Use stored value. Answer to 5 decimal places.arrow_forwardA consolidated undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: chamber confining pressure = 110kpa deviator stress at failure = 96kpa pore water pressure = 66kpa these test results were used to determine the drained friction angle of the soil. compute the deviator stress in (kpa) at failure when the drained test was conducted with the chamber confining pressure changed to 163kpa.arrow_forward
- A sample of dry sand in relatively loose condition is subject to a triaxial test. The sample fails when the confining stress (minor principal stress) is 50 kPa and the axial stress (major principal stress) is 170 kPa. What is the angle of internal friction for the soil?arrow_forwardThe height of the sample sand to be tested = 20 cm and the height of the saturated sand = 16 cm. Find the bulking of sand. 1. 20% 2. 55.5% 3. 25% 4. 80%arrow_forwardA sample of dry sand is subjected to a triaxial test . The angle of internal friction is 36° . If the cell pressure is 180 kN/m^2 , at what value of deviator stress will the soil fail ?arrow_forward
- Determine the shear strength parameters for a given soil using the direct shear test sample No1. Calculate the Shear Load in Newtons and Shear Stress in KPa in the box below.arrow_forwardVolume of a soil sample obtained was 150 cm^3 and its total mass was found to be 250 g. In the laboratory the dry mass of the sand alone was found to be 240 g. Tests on the dry sand indicated e-max = 0.80 and e-min = 0.48. Estimate ps, w, e, S, pd and Dr of the sand in the field. Given Gs = 2.67. %Darrow_forwardsolve the question provided in the image.arrow_forward
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