Which rock mass classification system is widely used for tunnels

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Which rock mass classification system is widely used for tunnels?

A. Atterberg limits

B. Terzaghi system

C. RMR (Rock Mass Rating)

D. Casagrande method

Answer: Option C

The RMR system evaluates rock mass quality using parameters like UCS, joint spacing, condition, and water conditions.It guides tunnel support design.

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