The table below contains data obtained from 2 CU triaxial tests on similar clay specimens.Specimen no.Cell pressure duringconsolidation (kPa)Deviatoric stress atfailure (kPa)269Pore water pressureat failure (kPa)26440037912462689Calculate the cohesion, c (kPa) of the clay soil in terms of total stress. Enter answer to 1 d.p. and don't enter units.

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The table below contains data obtained from 2 CU triaxial tests on similar clay specimens. Specimen no. Cell pressure during consolidation (kPa) Deviatoric stress at failure (kPa) Pore water pressure at failure (kPa) 269 264 379 400 1 2 462 689 Calculate the cohesion, c (kPa) of the clay soil in terms of total stress. Enter answer to 1 d.p. and don't enter units.

The table below contains data obtained from 2 CU triaxial tests on similar clay specimens. Specimen no. Cell pressure during consolidation (kPa) Deviatoric stress at failure (kPa) Pore water pressure at failure (kPa) 269 264 379 400 1 2 462 689 Calculate the cohesion, c (kPa) of the clay soil in terms of total stress. Enter answer to 1 d.p. and don't enter units.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A series of unconsolidated undrained (UU) triaxial compression tests have been performed on two "identical" clay specimens. The test results are as follows: Test Number Confining Pressure (kPa)| Deviator Stress at Failure (kPa) 102 96 (i) (ii) 1 2 50 100 Plot the total stress Mohr circles for both specimens at failure (indicate the major and minor principal stresses on the plot). Draw the total stress Mohr-Coulomb failure envelop (i.e., the "p=0" envelop). Estimate the undrained shear strength.
For a direct shear test on a soil having USCS classification SP, the shear stress at failure was 45.5 kPa for a normal stress of 65 kPa. What is the effective friction angle for this material? Sketch and label the Mohr's Circle and Mohr-Coulomb failure envelope.
A sand sample is subjected to direct shear testing at it's (in - situ) water content. Two tests are performed. For one of the tests, the sample shears at a stress of 400 kPa when the normal stress is 600 kPa. From these data,Determine the value of the apparent cohesion. Determine the corresponding angle of internal friction.
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4. A sandy soil sample was subjected to a consolidation pressure of 100 kPa and Consolidated drained test was conducted on it. The failure plane angle which the sample made at failure with respect to horizontal was 60°. Find the vertical stress at failure. If instead of increasing the vertical stress, it was decreased gradually, explain why the sample would fail. Obtain the shear and normal stress at failure for both of these conditions.
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