It 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?

Answered: It is known that a particular deposit…

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 12.18P

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Question

It 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?

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Given data:-

$C' = 15 kPa φ' = 23 ° C_{u} = 10 kPa φ C_{u} = 13 ° σ_{3} = 250 kPa$

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