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Empirical equations relating Q with rock mass properties.
| Parameters | Relationship | References |
|---|---|---|
| Q | Q | |
| RMR | RMR = 7lnQ + 36 | Tugrul (1998)80 |
| Cohesion (kPa) | c = 5 × (RMR − 1) | Bieniawski (1989)59,81 |
| Internal friction angle φ (°) | φ = 0.5RMR + 4.5 | Bieniawski (1989)59,81 |
| Young’s modulus E (GPa) | E = 2 × RMR − 100 (RMR > 50) | Bieniawski (1978)82, Serafim and Pereira (1983)83 |
| E = 10(RMR − 10)/40 (RMR ≤ 50) | Bieniawski (1978)82, Serafim and Pereira (1983)83 |
