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In active stress, the major principal stress σ1 acting on the wall will be in __________ plane.

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+1 vote
in Geotechnical Engineering II by (93.7k points)
In active stress, the major principal stress σ1 acting on the wall will be in __________ plane.

(a) Vertical

(b) Horizontal

(c) Inclined

(d) Zero

This question was posed to me in a job interview.

My doubt stems from Plastic Equilibrium in Soils : Active and Passive States topic in chapter Failure Envelopes & Earth Pressure of Geotechnical Engineering II

1 Answer

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by (243k points)
Correct answer is (b) Horizontal

The explanation: In an active state, the major principal stress σ1 is vertical and the minor principal stress σ3 is horizontal.

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