Table 4 Physical and mechanical indexes of rock mass.
Rock mass type | Density (g/cm3) | Unit weight (kN·m−3) | Elastic modulus (GPa) | Poisson’s ratio | Internal frictional angle (°) | Cohesion (MPa) | Tensile strength (MPa) |
|---|---|---|---|---|---|---|---|
Granite | 2800 | 28.0 | 48.1 | 0.27 | 50 | 1.8 | 5.5 |
Slate | 2500 | 24.0 | 41.8 | 0.35 | 30 | 0.3 | 2.5 |
Sandstone | 2600 | 26.0 | 45.5 | 0.22 | 48 | 1.6 | 4.0 |
