Soil Mechanics and Foundation Engineering - Engineering

Q1:

Failure of the stability of slopes, generally occurs along

A slip plane

B a horizontal surface

C a curved surface

D all the surfaces.

ANS:C - a curved surface

I think it's slip surface, there is some limitations when we say curved surface. All curved surfaces are not slope failure surfaces. Failure of finite slopes occurs along a curved surface. In stability computation, the curve is represented by an arc of a circle or logarithmic scale.