2.19 A consolidated-drained triaxial test was carried out on a nor- mally consolidated clay specimen, and the following results were recorded: σ 150 kN/m 2 and ΔΟ, -260 kN/m2 An identical specimen from the same clay was subjected to a consolidated-undrained test with a confining pressure of 150 kN/m2, and the additional axial stress at failure was 115 kN/m2 a. What is the pore water pressure at failure in this second specimen? b. What is Skempton's pore pressure parameter A at failure?

Principles of Geotechnical Engineering (MindTap Course List)
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Author:Braja M. Das, Khaled Sobhan
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Chapter12: Shear Strength Of Soil
Section: Chapter Questions
Problem 12.20P
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subject: Geotechnical Engineering

book: principle of foundation engineering - Braja M Das

2.19
A consolidated-drained triaxial test was carried out on a nor-
mally consolidated clay specimen, and the following results
were recorded: σ 150 kN/m 2 and ΔΟ, -260 kN/m2
An identical specimen from the same clay was subjected
to a consolidated-undrained test with a confining pressure
of 150 kN/m2, and the additional axial stress at failure was
115 kN/m2
a. What is the pore water pressure at failure in this second
specimen?
b. What is Skempton's pore pressure parameter A at failure?
Transcribed Image Text:2.19 A consolidated-drained triaxial test was carried out on a nor- mally consolidated clay specimen, and the following results were recorded: σ 150 kN/m 2 and ΔΟ, -260 kN/m2 An identical specimen from the same clay was subjected to a consolidated-undrained test with a confining pressure of 150 kN/m2, and the additional axial stress at failure was 115 kN/m2 a. What is the pore water pressure at failure in this second specimen? b. What is Skempton's pore pressure parameter A at failure?
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