Name | Description |
RQD | Rock Quality Designation. |
Jw, Jn, Jr, Ja, SRF | Q system factors [71]. |
Q | Rock mass quality index [71]. |
Q’ | Altered form of the Q index (Q’ = RQD/Jn * Jr/Ja). |
UCS | Uniaxial Compressive Strength. |
P1, P2, P3, P4, P5, P6 | RMR weights related to: UCS, RQD, joint spacing, joint conditions, water conditions and joint orientation. |
P41, P42, P43, P44, P45 | Joint conditions – persistence, aperture, rugosity, filling and weathering. |
RMR, class | RMR proposed by Bieniawski [72] and classification. |
RQD/Jn, Jr/Ja, Jw/SRF | Ratios of the Q system parameters. |
logQ, logQ' | Base 10 logarithm of Q and Q’. |
GSI | Geological Strength Index [73]. |
N | Altered form of the Q index (Q' = RQD/Jn*Jr/Ja*Jw). |
RCR | Altered form of RMR (RCR = P2+P3+P4+P5+P6). |
φ’, c’, E | Friction angle, cohesion and deformability modulus. |