Question

Q1)
The unconfined compression test is a special type of
unconsolidated-undrained triaxial test in which the confining
pressure is zero. What is the axial stress at failure referred to?

a) Undrained shear strength

b) cohesion

c) unconfined compressive strength

d) deviatoric stress

Answer #1

Ans. (C) unconfined compresive strength

In
an unconfined compression test, is the shear stregth (undrained)
found also representative of the shear strength (undrained) at
different confining pressures?

Triaxial Test:
1) Unconfined compression test is a special type of ...
a) UU test
b) CU test
c) CD test
d) none of the above
2) phi = 0 condition is observed in...
a) UU test on clays
b) UU test on saturated clays
c) CU test on saturated clays
d) CD test on saturated clays

A sample of normally consolidated clay was subjected to a CU
triaxial compression test that was carried out until the specimen
failed at a deviator stress of 50 kN/m2. The pore water pressure at
failure was recorded to be 18 kN/m2, and a confining pressure of 48
kN/m2 was used in the test. The cohesion of the clay was 20 kN/m2
at the failure. draw both the effective stress strength envelope
and total stress strength envelope. identify the effective internal...

A cohesive soil sample tested in an unconfined compression test
failed by developing a failure plain when the axial load on the
sample was 193 N. Determine the undrained shear strength,
Cu (kPa) of the soil given the original diameter of the
sample was 45 mm and the strain at failure was 9%. Provide your
answer in kPa as a whole number.

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 drained triaxial test is conducted on a soil with friction
angle of 25° and zero cohesion, using a chamber pressure sc=300 kPa
and a back pressure (this is the term used to denote the initial
value of the pore pressure, u0) equal to 200 kPa. The shear stage
of the test is performed DRAINED by increasing the axial stress s1,
while concurrently decreasing the chamber pressure s3 so that their
sum remains constant (s1+s3 = constant). Draw the effective...

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...

6- Which test is more suitable to analyse the short-term
behaviour of a foundation on a saturated clay (a) Consolidated
Drained test (b) Unconsolidated Undrained test (c) Unconfined
Compression test (d) None of the above

(a)
Two separate direct shear tests were conducted on soil samples with
the shear box having dimensions of 80 mm × 80 mm on plan view.
Assuming this cross-sectional area remains unchanged, determine the
cohesion intercept (c’) and friction angle (φ’) of the soil based
on the following results obtained at failure.
Direct shear test results
Test Normal force (N) Shear force (N)
1 210 257
2 360 372
(b)
A CU triaxial test was conducted on a specimen of...

1.Which of the following is true of Chow
test?
a.
It is a type of sign test.
b.
It is only valid under heteroskedasticity.
c.
It is only valid under homoskedasticty.
d.
It is a type of t test.
2.
Consider the following simple regression model
y = β0 +
β1x1 + u. Suppose
Corr(x,u) > 0, Corr(z,x)
> 0, and Corr(z,u) < 0. Then, the IV
estimator has a(n) _____.
a.
substantial bias
b.
downward bias
c.
asymptotic bias...

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