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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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A normally consolidated clay sample, which is fully saturated, was consolidated in the
triaxial cell under a particular all-round pressure of σ3. Upon consolidation, drainage valve is
closed and σ3 is kept constant while deviatoric stress was gradually increased under undrained
condition until failure is reached. The following results are obtained:

½ (σ1 – σ3) = 1/3 σ3 and ½ (σ1′ + σ3′) = 2/3 σ3

a) Determine φ′,
b) Express the pore pressure, uf, at failure in terms of cell pressure,
c) Determine pore pressure coefficient Af′ at failure

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