Question

Estimate the undrained shear strength of a saturated
overconsolidated clay under (a) compression and (b) extension, if
φ’_{cs} = 30^{o}, R_{o} = 5, λ = 0.2, κ =
0.04 and p’_{o} = 60 kPa.

Answer #1

A normally consolidated clay deposit has an undrained shear
strength equal to 139.8 kN/m2. From drained test values
of c and phi are found to be 21.8 kPa and 31.7 degrees,
respectively. Use formulation
If failure occurs in either the undrained state or drained
state, what is the major effective principal stress at failure in
kPa?
If failure occurs in the undrained state, what is the minor
effective principal stress at failure in kPa?

Two triaxial compression tests are conducted on identical
specimens of the same saturated clay. In the first test the soil is
first consolidated to sc=350 kPa and u0=200 kPa and then sheared
under drained conditions increasing the axial stress while keeping
the chamber pressure constant. At failure s1= 560 kPa. In the
second test, the specimen is consolidated to sc=600 kPa and u0=400
kPa, then it is sheared under undrained conditions increasing the
axial stress while keeping the chamber pressure...

A normally consolidated clay is consolidated under a stress of
100 kPa, then sheared undrained in a triaxial compression. The
principal stress difference (deviatoric stress) at failure is 250
kPa and the induced pore pressure is 60 kPa. Calculate the minor
principal stress at failure in term of effective stress
(s3')f? (Unit: kPa).

Calculate the settlement under the center of a
flexible foundation 4 m by 4 m due to volume distortions occurring
in a saturated clay stratum but where rock exists at a depth 8 m
below the foundation. The clay shear strength c is 60 kPa. The
total foundation loading imposed onto the soil is 2,400 kN.

Shear strength measurements derived from unconfined compression
tests for two types of soils gave the results shown in the
following summary statistics (measurements in tons per square
foot).
Summary Statistics
Soil Type I: Sample size = 25, Sample mean = 1.65, Sample std =
0.26
Soil Type II: Sample size = 31, Sample mean = 1.43, Sample std =
0.22.
Do the soils appear to differ with respect to the variability of
shear strength? Preliminary data analyses and other information...

An isotropically consolidated drained (ICD) triaxial compression
test is performed on a saturated wellgraded sand (SW) with a peak
effective friction angle of 36 degrees and initial relative density
of 60 percent. The specimen is consolidated to an effective stress
of 200 kPa. (a) Determine the peak deviator stress that can be
applied to this specimen. (b) For the above loading, determine the
maximum shear stress and the orientation of the planes on which it
acts. Also, determine the ratio...

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