Discussion
Assertion (A): Grouted rock revetments can perform worse than ungrouted ones once damaged.
Reason (R): Grouting removes the permeability and turns a flexible layer into a rigid one.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains the mechanism. Grouting converts a flexible, permeable, self-healing layer into a rigid impermeable slab. Water that would have drained through now builds up pressure behind the face, and the layer can no longer settle to accommodate movement; when it does crack, the fragments are large, the underlayer is exposed at once, and the damage spreads rapidly. An ungrouted slope, by contrast, deforms and continues to work.
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