Discussion
A rock quality designation of 20 per cent classifies the rock mass as
Answer: B
Correct answer: very poor
The standard classification runs: 0 to 25 per cent very poor, 25 to 50 poor, 50 to 75 fair, 75 to 90 good, and 90 to 100 excellent. Twenty per cent therefore falls in the worst class, indicating a heavily fractured rock mass that will need substantial support in a tunnel and cannot be relied on to stand in a steep face.
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