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 12.13P
To determine
Find the Skempton’s pore pressure parameter,
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Question 42
The results of two consolidated-drained test triaxial tests on a clay are given below:
Specimen No.
Chamber Pressure
Deviator Stress
105
220
210
400
1. Determine the angle of internal friction.
2. Determine the cohesion of the clay.
3. Determine the normal stress on the point on the failure plane of the 2nd specimen.
Question 1: A. 26.744
O Question 1: B. 26.042
Question 1: C. 27.871
O Question 1: D. 27.486
Question 2: A. 10.737
O Question 2: B. 12.141
Question 2: C. 17.372
Question 2: D. 14.836
Question 3: A. 317.694
O Question 3: B. 232.575
Question 3: C. 230.306
O Question 3: D. 322.194
Question 3
The results of two consolidated-drained test triaxial tests on a clay are given below:
Specimen No.
Chamber Pressure
Deviator Stress
220
400
105
II
210
1. Determine the angle of internal friction.
2. Determine the cohesion of the clay.
3. Determine the normal stress on the point on the failure plane of the 2"d specimen.
O Question 1: A. 26.744
O Question 1: B. 26.042
O Question 1: C. 27.871
O Question 1: D. 27.486
O Question 2: A. 10.737
O Question 2: B. 12.141
O Question 2: C. 17.372
O Question 2: D. 14.836
O Question 3: A. 317.694
O Question 3: B. 232.575
O Question 3: C. 230.306
O Question 3: D. 322.194
O O O O O O O CO
In a tri-axial test of a silty soil, the sample failed at normal stress of 475 kPa and a shear stress of 350 kPa.
1. Which of the following gives the angle of internal friction.
2. Compute the angle that the failure plane makes with the x-axis
3. Compute the maximum failure stress
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 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.arrow_forwardA consolidated-undrained triaxial compression test was performed on a normalconsolidated clay sample. During the experiment, the confining pressure was 140 kPa, thedeviator stress was 125 kPa, and the pore water pressure was 75 kPa at the time of failure.According to the information given:i- Find the consolidated-undrained internal friction angle of the clay. ii- Find the drained friction angle of the clayarrow_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
- In a tri-axial test of normally consolidated clay, the sample subjected to chamber confining pressure of 250 kPa and failed when deviator stress is 350 kPa. Which of the following gives the angle of internal friction? Which of the following gives the shear stress at failure? Which of the following gives the effective normal stress at maximum shear?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 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.arrow_forward
- A 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_forwardIn a tri-axial test of normally consolidated clay, the sample is subjected to chamber of confining pressure of 275 kPa and failed when deviator stress is 375 kPa. 1. Which of the following gives the angle of internal friction? a. 29.32° b. 32.29° c. 22.29° d. 23.92° 2. Which of the following gives the shear stress at failure? a. 187.50 kPa b. 342.79 kPa c. 171.40 kPa d. 205.12 kPa 3. Which of the following gives the effective normal stress at maximum shear? a. 462.50 kPa b. 605.00 kPa c. 512.50 kPa d. 325.00 kPaarrow_forwardThe results obtained from a series of CU test on a soil gave the following results : CCU = C'CU = 0 cu 15°; 'cu = 30° CU A sample of this soil was tested in a CU test under a cell pressure of 150 kN/m². Determine (i) deviator stress at failure (ii) pore water pressure at failure (iii) minor principal effective stress at failure (iv) major principal effective stress at failure (v) the magnitude of Skempton's pore water pressure parameter(at failure) Aarrow_forward
- 3. A consolidated-undrained test was conducted on a normally consolidated clay sample. The results are as follows: Undrained angle of friction = 32.21°, Drained angle of friction = 63.54°, Deviator stress at failure = 511 lb/ft^2. Determine the pore water stress at failure in lb/ft^2. Round off to three decimal places.arrow_forwardQuestion 34 A consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 109 kPa, Deviator stress at failure = 91 kPa, Pore Water Pressure = 54 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 167 kPa. Round off to two decimal places.arrow_forwardA consolidated-undrained test was conducted on a normally consolidated clay sample. The results are as follows: Undrained angle of friction = 38.65°, Drained angle of friction = 62.59°, Deviator stress at failure = 509 lb/ft^2. Determine the pore water stress at failure in lb/ft^2.arrow_forward
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