Research Article
Simulation Study of the Roof Fracture Pattern of a Horizontal Sublevel Caving in a Steeply Inclined Thick Coal Seam
Table 1
Physical and mechanical parameters of coal and rock mass.
| Rock | Body force γ (kN/m3) | Elasticity modulus E (GPa) | Poisson’s ratio v | Tensile strength (MPa) | Cohesion (MPa) | Internal friction angle (°) |
| Fine sandstone | 28.7 | 33.4 | 0.235 | 1.29 | 3.2 | 42 | Mudstone | 24.8 | 17.7 | 0.204 | 0.58 | 1.2 | 33 | Coal | 13.3 | 5.3 | 0.32 | 0.15 | 1.25 | 32 | Mudstone | 24.8 | 17.7 | 0.204 | 0.58 | 1.2 | 33 | Siltstone | 24.6 | 19.5 | 0.2 | 1.84 | 2.75 | 38 |
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