Research Article
Research on the Rock Pressure Behavior at Close-Distance Island Working Faces under Deep Goaf
Table 1
Physical and mechanical parameters of rock mass used in calculation.
| | Rock formation name | Bulk density, γ (kg/m3) | Bulk modulus, K (GPa) | Shear modulus, G (GPa) | Cohesion, c (MPa) | Internal friction angle, φ (°) | Tensile strength, σb (MPa) |
| | Middle-fine sandstone | 2580 | 5.6 | 4.2 | 8 | 38 | 3.5 | | Siltstone | 2680 | 5.6 | 4.2 | 8 | 38 | 3.5 | | 5 coal | 1410 | 1.73 | 0.82 | 0.18 | 20 | 0.2 | | 6-1 coal | 1390 | 2.0 | 0.88 | 0.42 | 24 | 0.3 | | Fine sandstone | 2800 | 16.04 | 12.02 | 3.47 | 43 | 4.96 | | Mudstone | 2567 | 4.3 | 2.8 | 0.7 | 30 | 1.68 |
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