4. The failure envelope for drained peak (intact) strength ofa highly overconsolidated clay exhibits pronounced curvaturein the low effective normal stress range. For this reason intactstrength is defined using different values of intercept and angleof failure envelope for each range of effective normal stresso. An intact specimen of this clay is consolidated under anequal all-around pressure of 50 kPa and then axial stress isincreased under drained conditions until the maximum principalstress difference of 135 kPa is reached. Compute: (a) angle ofthe Mohr-Coulomb failure envelope for this stress condition,assuming an intercept of 10 kPa; (b) drained shear strengthon' the failure surface of the specimen, defined by the Mohr-Coulomb failure criterion; (c) drained shear strength of a nor-mally consolidated specimen of the same clay composition, ona failure surface with the same effective normal stress as inpart (b) on the assumption that the angle of internal friction o'is 20°; (d) fully softened shear strength of the intact specimen,on a failure surface with an effective normal stress as in part(b); and (e) residual shear strength on a preexisting shear surfaceof the overconsolidated clay, with an effective normal stress asin part (b) and for a residual friction angle o, equal to 10°.

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4. The envelope highly overconsolidated clay exhibits pronounced curvature a the low effective normal stress range. For this reason intact trength is defined using different values of intercept and angle of failure envelope for each range of effective normal stress An intact specimen of this clay is consolidated under an equal all-around pressure of 50 kPa and then axial stress is ncreased under drained conditions until the maximum principal stress difference of 135 kPa is reached. Compute: (a) angle of long for this ndition

4. The envelope highly overconsolidated clay exhibits pronounced curvature a the low effective normal stress range. For this reason intact trength is defined using different values of intercept and angle of failure envelope for each range of effective normal stress An intact specimen of this clay is consolidated under an equal all-around pressure of 50 kPa and then axial stress is ncreased under drained conditions until the maximum principal stress difference of 135 kPa is reached. Compute: (a) angle of long for this ndition

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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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

4. The failure envelope for drained peak (intact) strength of
a highly overconsolidated clay exhibits pronounced curvature
in the low effective normal stress range. For this reason intact
strength is defined using different values of intercept and angle
of failure envelope for each range of effective normal stress
o. An intact specimen of this clay is consolidated under an
equal all-around pressure of 50 kPa and then axial stress is
increased under drained conditions until the maximum principal
stress difference of 135 kPa is reached. Compute: (a) angle of
the Mohr-Coulomb failure envelope for this stress condition,
assuming an intercept of 10 kPa; (b) drained shear strength
on' the failure surface of the specimen, defined by the Mohr-
Coulomb failure criterion; (c) drained shear strength of a nor-
mally consolidated specimen of the same clay composition, on
a failure surface with the same effective normal stress as in
part (b) on the assumption that the angle of internal friction o'
is 20°; (d) fully softened shear strength of the intact specimen,
on a failure surface with an effective normal stress as in part
(b); and (e) residual shear strength on a preexisting shear surface
of the overconsolidated clay, with an effective normal stress as
in part (b) and for a residual friction angle o, equal to 10°.

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