Discussion
A rotational slide is distinguished by a failure surface that is
Answer: D
Correct answer: curved, concave upward
A rotational slide fails on a curved surface, so the mass rotates backwards as it moves: the head drops leaving a steep scarp, the surface tilts back towards the slope, and the toe bulges outward. It is characteristic of thick homogeneous clay, where no plane of weakness dictates the surface and it forms in the position of least resistance. A planar surface indicates a bedding plane or joint controlling the failure.
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