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During the passive state of plastic equilibrium, the retaining wall moves _______

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+1 vote
in Geotechnical Engineering II by (93.8k points)
During the passive state of plastic equilibrium, the retaining wall moves _______

(a) towards the fill

(b) away from the fill

(c) does not change its position

(d) remains in equilibrium

This question was addressed to me during a job interview.

My question is taken from Earth Pressure Introduction in section Failure Envelopes & Earth Pressure of Geotechnical Engineering II

1 Answer

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by (243k points)
Right option is (a) towards the fill

Easy explanation: During the passive state of plastic equilibrium, the major principal stress denoted by σ1  is in horizontal direction and the minor principal stress σ3  is in vertical direction. Therefore, the movement of the wall will be towards the back fill.

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