10.11 A consolidated drained triaxial test was carried out on a normally con- solidated clay specimen with confining pressure of 75.0 kN/m². The deviator stress at failure was 96.0 kN/m². An identical specimen of the same clay was subjected to a consolidated undrained triaxial test, where the confining pressure is 150.0 kN/m². The deviator stress at failure was 115.0 kN/m². What would be the pore water pressure at failure?

10.11 A consolidated drained triaxial test was carried out on a normally con- solidated clay specimen with confining pressure of 75.0 kN/m². The deviator stress at failure was 96.0 kN/m². An identical specimen of the same clay was subjected to a consolidated undrained triaxial test, where the confining pressure is 150.0 kN/m². The deviator stress at failure was 115.0 kN/m². What would be the pore water pressure at failure?

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.20P

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A consolidated drained (CD) triaxial test was carried out on a normally consolidated clay. The specimen was consolidated under a cell pressure of 100 kPa and back pressure of 30 kPa. The axial deviatoric stress was increased very slowly to failure, so that there was no excess pore water pressure developed during the shearing. The specimen failed under a deviatoric stress of 130 kPa. The back pressure of 30 kPa was maintained throughout the test. (i) What is the friction angle in terms of effective stresses? (ii) What are the shear stress and normal stress acting on the failure plane? Solution fast please
A consolidated drained (CD) triaxial test was carried out on a normally consolidated clay. The specimen was consolidated under a cell pressure of 100 kPa and back pressure of 30 kPa. The axial deviatoric stress was increased very slowly to failure, so that there was no excess pore water pressure developed during the shearing. The specimen failed under a deviatoric stress of 130 kPa. The back pressure of 30 kPa was maintained throughout the test. (1) What is the friction angle in terms of effective stresses? (ii) What are the shear stress and normal stress acting on the failure plane?
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