Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Question
Chapter 12, Problem 12.22P
To determine
Find the pore pressure at failure for the unconfined compression test.
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Data from an oedometer test using a clay specimen are plotted in the graph shown below. If the compression index is equal to 0.6, calculate the void ratio (e2) missing at Point C, which is associated with a vertical effective stress equal to 105 kPa
A consolidated undrained (CU) triaxial compression test is conducted on a normally consolidated clay at a confining pressure of 100 kPa. The deviator stress at failure is 80 kPa, and the pore-water pressure measured at failure is 50 KPa. The effective angle of internal friction (indegrees, up to one decimal place) of the soil is..?
Consolidation of an undrained clay occurs at an effective pressure of 100 kPa and a shear stress of 40 kPa. The ratio of effective pressure to shear stress in drained clay is 2 to 1. If the shear stress at zero effective pressure, To, is 10 kPa, what is the pore water pressure at failure?
A. 10 kPa
в. 40 кра
с. 53 кра
D. 67 kPa
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-undrained triaxial test was conducted on a dense sand with a confining pressure of 138 kN/m2. Results showed that ϕ′=24 deg and ϕ=31 deg. Determine the deviator stress and the pore water pressure at failure.arrow_forwardA clay specimen with drained shear strength parameters of c'=5 kPa and Φ=320 is consolidated under all around pressure of 140 kPa.The specimen was then loaded axially to failure under undrained condition and failed when the principal stress diffrences reached 60 kPa.Calculate the pore pressure(u) and the pore pressure coefficient D(=A*B=Δu/Δσv) of the clay.arrow_forwardExperimental data for clay specimen obtained initial values of e1 = 1.12 and P1 = 90 kPa, and final values of e2 = 0.90 and P2 = 460 kPa Solve for the compression indexarrow_forward
- A saturated specimen of cohesionless sand was tested under drained conditions in a triaxial compression test apparatus and the sample failed at a deviator stress of 482 kN/m2 and the plane of failure made an angle of 60° with the horizontal. What would be the magnitude of the deviator stress in kPa at failure for identical specimen of sand if it is tested under a cell pressure of 200 kPa? Show diagramarrow_forwardUndisturbed samples from a normally consolidated clay layer were collected during a subsoil exploration .Drained triaxial tests showed that the effective friction angle was ? ′ = 25°. The unconfined compressive strength, ??, of a similar specimen was found to be 133 KN/m2 . Find the pore pressure at failure for the unconfined compression test.arrow_forwardIn a drained triaxial compression test, a saturated specimen of cohesionless sand fails at a deviator stress of 450 kN/m2 when the cell pressure was 135 kN/m2. Find the angle of inclination of the failure plane with the horizontal. Show diagramarrow_forward
- A 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 saturated clay layer (300cm in thickness) was sitting upon the rock, its unit weight was = 20kN/m3, an oedometer test also found that Cc = 0.2, Cr = 0.04. The existing vertical effective stressin the field is 200 kPa. Construction will increase the vertical stress at the centre of the clay by = 600 kPa.a) Calculate the primary consolidation settlement of clay layer if it has been subjected toa load at OCR = 2.b) Assume spatial variation of pore pressure u with time t and depth z is onedimensional,and governed by:where Cv is a given constant, specify its boundary and initial condition, and try toillustrate the pore pressure change with time along its depth.arrow_forwardA consolidated-drained triaxial test on a normally consolidated clay yielded a friction angle, Φ', of 28°. If the all-around confining pressure during the test was 140 kN/m2, what was the major principal stress at failure?arrow_forward
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