Research Article
Excavation Sequence and Surrounding Rock Mass Stability of Large-Scale Underground Engineering with 8 Tunnels
Table 3
Physical and mechanical parameters of the rock mass, shotcrete, and bolt.
| | Material | Density (g/cm3) | Poisson’s ratio | Deformation modulus (GPa) | Friction coefficient | Cohesion (MPa) | Tensile strength (MPa) |
| | Rock II | 2.6 | 0.20 | 6.0 | 1.0 | 1.2 | 1.0 | | Rock III | 2.6 | 0.25 | 4.0 | 0.8 | 0.8 | 0.6 | | Rock IV | 2.4 | 0.30 | 2.0 | 0.7 | 0.5 | 0.45 | | Shotcrete | 2.4 | 0.167 | 25.0 | | | 1.1 | | Bolt steel | 7.8 | 0.30 | 210.0 | | | 310.0 |
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