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CE 467L Geotechnical Engineering
Spring 2010
Homework 7
Due: Thursday, April 1, 2010
Answer the following questions and/or complete the following problems.
1.
Problem 4.2 in Craig.
Hint: this problem must be solved graphically.
Plot the Mohr
circles at failure as neatly as possible.
Remember, the
τ
and
σ′
axes must be plotted to
the
same scale
to be able to evaluate the strength parameters in this graphical manner.
2.
A consolidated undrained (CU) triaxial compression test (TXC) was conducted on a
specimen of saturated clay.
The specimen was isotropically consolidated to a stress of
300 kPa, with u
bp
= 0.
At failure, the excess pore water pressure, u
e
, was 168 kPa, and
the deviator stress was 202 kPa.
Determine the MohrCoulomb strength parameters for
this soil.
3.
A specimen of sand was tested in a consolidated drained (CD) TXC test.
The specimen
was isotropically consolidated to a total cell pressure of 600 kPa, and the backpressure
(u
bp
) was 200 kPa.
The principal stress difference at failure was 1140 kPa.
Calculate the
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This note was uploaded on 09/13/2010 for the course CE 467L taught by Professor Rechenmacher during the Spring '10 term at USC.
 Spring '10
 Rechenmacher
 Geotechnical Engineering

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