Table 6 Parameters for stability calculation.
Rock type | Density (kg/m3) | Uniaxial compression stress (MPa) | Elastic modulus (GPa) | Poisson's ratio | Hoek–Brown strength parameters | ||
|---|---|---|---|---|---|---|---|
GSI | D | mi | |||||
Migmatite | 2600 | 62.29 | 38.72 | 0.33 | 35 | 0.9 | 12 |
Porphyrite | 2700 | 79.61 | 41.19 | 0.28 | 45 | 0.8 | 15 |
Granite | 2700 | 83.55 | 54.13 | 0.20 | 50 | 0 | 18 |
Magnetite quartzite | 3000 | 109.32 | 77.42 | 0.11 | 50 | 0.9 | 20 |