Research Article
Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
Table 2
Mechanical parameters of surrounding rock model.
| | Ground layers | Bulk modulus B (MPa) | Poisson’s ratio μ | Tension strength σt (MPa) | Cohesion C (MPa) | Inner friction angle ψ (°) | Density (kg/m3) | Elastic shear modulus GM (GPa) | Kelvin shear modulus GK (GPa) | Maxwell dynamic viscosity ηM (GPa·s) | Kelvin viscosity ηK (GPa·s) |
| | Mudstone | 500 | 0.3 | 0.15 | 0.5 | 27 | 2200 | 1.0 | 5.23 | 1.1 × 108 | 1.73 × 106 | | Coal | 400 | 0.3 | 0.1 | 0.4 | 25 | 2200 | 1.0 | 5.23 | 1.1 × 108 | 1.73 × 106 | | Oil shale | 600 | 0.3 | 0.15 | 0.6 | 27 | 2200 | 1.0 | 5.23 | 1.1 × 108 | 1.73 × 106 |
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