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Certificate In Rock Mechanics Exam Practice Questions - Certificate In Rock Mechanics (South Africa) Exam

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A underground drive in norite exhibits RQD = 80%, joint set number Jn = 9 (three joint sets), joint roughness Jr = 2 (smooth undulating), joint alteration Ja = 1 (unaltered), joint water reduction Jw = 1 (dry), and stress reduction factor SRF = 2.5 (medium stress). Calculate the rock mass Q value.
Correct Answer:
7.1

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