Rock mass classification | Bulk density (kN/m3) | Deformation modulus (GPa) | Friction angle (°) | Cohesion (MPa) | Poisson’s ratio | Tensile strength (MPa) |
---|---|---|---|---|---|---|
II | 26.5 | 23.5 | 52.4 | 2.0 | 0.25 | 8.0 |
III | 26.5 | 9.5 | 47.7 | 1.4 | 0.27 | 6.0 |
IV | 26.5 | 2.5 | 38.7 | 0.7 | 0.35 | 4.0 |
II/III | 26.5 | 16.5 | 50.2 | 1.7 | 0.26 | 7.0 |