Q.9 An unconfined compression test wasconducted on an undisturbed sample ofclay. The initial area of the specimen is1105 mm?. The load at failure measured bythe proving ring was 32N and axial strainat failure was 0.162. The undrained shearstrength of the clay will be

given- unconfined compression test- area A=1105 mm2Load P=32 NAxial strain ε=0.162

Q.9 An unconfined compression test was conducted on an undisturbed sample of clay. The initial area of the specimen is 1105 mm2. The load at failure measured by the proving ring was 32N and axial strain at failure was 0.162. The undrained shear strength of the clay will be

Q.9 An unconfined compression test was conducted on an undisturbed sample of clay. The initial area of the specimen is 1105 mm2. The load at failure measured by the proving ring was 32N and axial strain at failure was 0.162. The undrained shear strength of the clay will be

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Shear Strength Of Soil

Section: Chapter Questions

Problem 10.23P

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Concept explainers

Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.

Question

Q.9 An unconfined compression test was
conducted on an undisturbed sample of
clay. The initial area of the specimen is
1105 mm?. The load at failure measured by
the proving ring was 32N and axial strain
at failure was 0.162. The undrained shear
strength of the clay will be

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An unconfined compression test was conducted on an undisturbed sample of clay. The initial area of the specimen is 1105 mm². The load at failure measured by the proving ring was 32N and axial strain at failure was 0.162. The undrained shear strength of the clay will be
a）For clays, the failure line (one that connects the peak failure stresses) in the normally consolidated range does not have a cohesion intercept, whereas the failure line in the overconsolidated range has a cohesion intercept. T or F B）During the shearing phase of a CU test, the void ratio of a NC consolidated clay specimen will: 1 decrease. 2 could increase or decrease. 3 remain a constant. 4 increase. C)What does the cohesion (that appears in the Mohr-Coulomb criterion) of OC clays depend on? 1the preconsolidation pressure. 2whether the failure stresses are total or effective. 3the soil type. 4everything listed here.
2. A series of consolidated, undrained triaxial tests were carried out on specimens of a saturated clay under no backpressure. The test data at failure are summarized: Confining Pressure (kPa) Deviator Stress (kPa) Pore Water Pressure (kPa) 150 192 80 300 341 154 450 504 222 a. Draw the Mohr circles and find the cohesion and friction angles in terms of effective stresses. b. Compute Skempton’s A-parameter at failure for all three specimens. c. Is the soil normally consolidated or overconsolidated? Why? d. Another specimen of the same clay that was consolidated under a cell pressure of 250 kPa was subjected to a consolidated, drained triaxial test. What would be the deviator stress at failure?
Data from the compression test on sample (i) is shown in Table 2. Plot thestress versus strain curve for this sample?
Assume that both a triaxial shear test and a direct shear test are to be performed on a sample of dry sand. When the triaxial shear test is performed, the specimen fails when the major and minor principal stresses are 80 and 20 lbs/in^2, respectively. When the direct shear test is performed, what shear strength can be expected if the normal stress is 4000 lbs/ft^2? Show all work.
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Assume that both a triaxial shear test and a direct shear test are to be performed on a sample of dry sand. When the triaxial shear test is performed, the specimen fails when the major and minor principal stresses are 80 and 20 lbs/in^2, respectively. When the direct shear test is performed, what shear strength can be expected if the normal stress is 4000 lbs/ft^2?
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