'Rock mass classification' by 'RMR' (Rock Mass Rating, Bieniawski) considers:
Choose the correct answer
Only uniaxial compressive strength
UCS + RQD + joint spacing + joint condition + groundwater + orientation adjustment — 6 parameters total, 0–100 score
Only the depth of the rock mass
Chemical composition of rock
Correct Answer
B. UCS + RQD + joint spacing + joint condition + groundwater + orientation adjustment — 6 parameters total, 0–100 score
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Bieniawski RMR (1973): 6 parameters: (1) UCS of intact rock (0–15 pts); (2) RQD (3–20 pts); (3) Spacing of discontinuities (5–20 pts); (4) Condition of discontinuities (0–30 pts); (5) Groundwater condition (0–15 pts); (6) Orientation of discontinuities (adjustment −12 to 0 pts). Total RMR 0–100. Class I (81–100): very good; II (61–80): good; III (41–60): fair; IV (21–40): poor; V (0–20): very poor rock. Used for: tunnel support design.
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