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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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
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.
Question Attached
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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- 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-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_forward
- hello, can i have help for this question please?arrow_forwardThe following data were obtained when a sample of medium sand was tested in a constant head permeameter:arrow_forwardA 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_forward
- Question 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 drained triaxial test on a 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 103.5 kN/m^2, what was the major principal stress at failure?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_forward
- Question 2 The result presented in Table Q2a were obtained from a consolidated drained (CD) triaxial test on a normally consolidated clay sample of 75mm height x 38mm diameter tested at a confining pressure of 50 kPa. Table Q2a. CD triaxial test result Axial strain (%) 1 2 5 10 15 Applied force (kN) 0.01 0.03 0.05 0.08 0.10 Page 3 of 6 (a) Draw the Mohr circle for each stress state in the sample and the total stress path (TSP) throughout the test and determine the slope of the TSP to the horizontal.arrow_forwardAn oedometer test is performed on a 2 cm thick clay sample. After 5 minutes, 50% consolidation is reached. After how long a time in no. of days would the same degree of consolidation be achieved in the field where the clay layer is 3.70 m thick? Assume the sample and the clay layer have the same drainage boundary conditions (double drainage).Show Diagram a.234 b.119 c.564.3 d.17.15arrow_forwardSubject : Geotechnical Engineering Read the question carefully and give me right solution with clear calculations If you don't know the solution please leave it.arrow_forward
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