GATE CE 2015 Set 1 — Question 24
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Geotechnical Engineering → Shear Strength of Soils → Triaxial Test
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Question
In an unconsolidated undrained triaxial test, it is observed that an increase in cell pressure from to leads to a pore pressure increase of . It is further observed that, an increase of in deviatoric stress results in an increase of in the pore pressure. The value of Skempton’s pore pressure parameter is:
Correct answer
(C) 0.8
Solution
Skempton's pore pressure equation is given by:In the first stage of the triaxial test, the cell pressure (confining pressure) is increased isotropically. Here, . The equation simplifies to:Given:
Increase in cell pressure,
Increase in pore pressure,
Substituting the values:
Increase in cell pressure,
Increase in pore pressure,
Substituting the values:
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