Question

When might the retaining walls prove to be not costly?

(a) When the movement is of deep nature

(b) When the movement is of unlimited nature

(c) When the movement is shallow in nature

(d) When the rocks are too heavy

I had been asked this question by my school teacher while I was bunking the class.

Origin of the question is Monitoring and Control of Mass Movements topic in section Mass Movements of Engineering Geology

Answer 1

The correct choice is (c) When the movement is shallow in nature

Best explanation: Retaining walls may prove costly failures when they are designed to resist slides of great volume and thickness or long rising slopes.