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Which type of rocks requires double lining, i.e., temporary and permanent lining?

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Which type of rocks requires double lining, i.e., temporary and permanent lining?

(a) Hard rocks

(b) Crystalline rocks

(c) Soft rocks

(d) Non-crystalline rocks

This question was posed to me during an interview.

The query is from Geological Investigations topic in division Tunnels of Engineering Geology

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Correct option is (c) Soft rocks

To elaborate: In most cases, the soft rocks are not self-supporting. Hence, temporary and permanent lining becomes necessary that would involve extra cost and additional time.

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