The major principal stress in an element of cohesion-less soil within...

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The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is

A. Vertical if the soil is in an active state of plastic equilibrium

B. Vertical if the soil is in a passive state of plastic equilibrium

C. Inclined at 45° to the vertical plane

D. None of the above

Answer: Option A

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