The major principal stress in an element of cohesionless soil within the backfill of a retaining wall is________________?

vertical if the soil is in a passive state of plastic equilibrium

vertical if the soil is in an active state of plastic equilibrium

inclined at 45° to the vertical plane

The major principal stress in an element of cohesionless soil within t

1.	The major principal stress in an element of cohesionless 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» B. vertical if the soil is in a passive state of plastic equilibrium