Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 12, Problem 12.6P
To determine
Find the deviator stress at failure.
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Students have asked these similar questions
A clay sample was consolidated in a triaxial cell under a backpressure of 50 kPa and cell pressure of 150 kPa. The drainage valve was then closed and the cell pressure was increased to 200 kPa when the pore pressure increased to 98 kPa. What is Skempton’s B-parameter? The above sample was then subjected to a vertical deviator stress, which was increased from zero under undrained conditions. The sample failed when the pore water pressure was 160 kPa and the deviator stress was 70 kPa. What is Skempton’s A-parameter at failure? Assuming the clay is normally consolidated, find the friction angle in terms of effective stresses.
A consolidated-drained triaxial test was conducted on an overconsolidated clay sample.
The sample failed in test 1 at 01=200 kPa and 03=130 kPa, and in test 2 at o1=400 kPa and
03=290 kPa. Determine the undrained and drained friction angles and cohesion for the
assumption that the Skempton's pore water pressure parameter A=0.45. Also, for a CU test on
the same soil, determine o1, 1', 03', and excess pore water pressure u for 03=340 kPa.
2- The following are the results of four drained direct shear tests on undisturbed normally consolidated clay samples
having a diameter of 2.0 inches and height of 1.0 inch.
a) Draw a graph on excel for shear stress at failure against the normal stress and determine the drained angle of
friction from the graph.
b) If a drained triaxial test is conducted on the same soil with a chamber confining pressure of 4,344 lb/ft², what
would be the deviator stress at failure?
c) For part b, what is the inclination of the failure plane with the major principal plane?
Shear Force at
Test No.
Normal Force
(lbf)
Failure (lbf)
1
56.2
31.2
84.3
47.0
101.1
56.2
121.4
67.4
23+
2
4
Chapter 12 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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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Similar questions
- A drained triaxial test on the normally consolidated clay showed that the failure plane makes an angle of 58 with the horizontal. If the sample was tested with a chamber confining pressure of 103.5KPA, what was the major principal stress at failure? (Unit in kPa) (Answer only number(whole number without unit) * Your answerarrow_forwardIt is known that a particular deposit of clay has the following shear strength parameters: c' = 15 kPa, o' = 23°; Cu = 10 kPa, cu = 13° A sample of this clay is consolidated in a triaxial cell to an all-round pressure (03) of 250 kPa. The sample is then sheared by increasing 0₁, keeping 3 constant and the drainage valve closed. What is: i) ₁ at failure? ii) Pore water pressure inside the sample at failure? iii) Final values of 0₁' and 03'? iv) Value at failure of Skempton's pore pressure coefficient A?arrow_forwardA Consolidated-Drained Triaxial Test was conducted on a normally consolidated clay. The results were as follows:· Chamber confining pressure = 400 kPa· Deviator Stress = 600 kPaa. Compute the angle of friction of the clay sample b. Compute the shear stress on the failure planearrow_forward
- A Consolidated-Drained Triaxial Test was conducted on a normally consolidated clay. The results were as follows:· Chamber confining pressure = 400 kPa· Deviator Stress = 600 kPaCompute the angle of friction of the clay samplearrow_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_forward8, The results of three consolidated-undrained triaxial tests on identical specimens of a particular soil are: Test no. a (kPa) a-a at pcak (kPa) u at peak (kPa) 200 244 55 107 2. 300 314 3. 400 384 159 Determine c and o. What would be the expected pore pressure at failure for a test with 03= 100 kPa? 9, A cylindrical specimen of a saturated soil fails under an axial stress 150 kN/m2 in an unconfined compression test. The failure plane makes an angle of 52° with the horizontal. Calculate the cohesion and angle of internal friction of the soil 10 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 total stress parameters. A further sample of the soil was tested in a shear box under the same drainage conditions as used for the…arrow_forward
- A drained triaxial test on the normally consolidated clay showed that the failure plane makes an angle of 58 with the horizontal. If the sample was tested with a chamber confining pressure of 103.5kPA, what was the major principal stress at failure? (Unit in kPa) (Answer only number(whole number without unit)arrow_forwardQuestion 1 A consolidated drained (CD) triaxial test was carried out on a sand sample with the known effective shear strength parameters, C' = 0 and ø′ = 30°. In the test, prior to the failure, when the sample was undergoing axial compression under constant cell pressure, the drainage valve was accidentally closed. At the failure, 360kPa deviatoric stress was recorded along with 70kPa pore water pressure. If the test is repeated without such error, and no back pressure is applied in either of the tests, what is the deviatoric stress (in kPa, in integer) at the failure? A 11 B C 350 D 500 200arrow_forwardA consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 110 kPa, Deviator stress at failure = 95 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 165 kPa.arrow_forward
- 6 A consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 115 kPa, Deviator stress at failure = 87 kPa, Pore Water Pressure = 56 kPa. 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 159 kPa. Round off to two decimal places.arrow_forwardA consolidated undrained triaxial test was conducted on a normally consolidated clay sample and the results are as follows: chamber confining pressure = 118 kpa, Deviator stress at failure 93 kpa, pore water pressure = 52 kpa. These results were used to determine the undrained friction angle of the soil. Compute the deviator stress (kPa) at failure when the drain test was conducted in the chamber confining pressure change to 168 kpaarrow_forwardA consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 119 kPa, Deviator stress at failure = 87 kPa, Pore Water Pressure = 68 kPa. 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 177 kPa. Round off to two decimal places. Answer: 301.94arrow_forward
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