Research Article
Research on the Characteristics of Coal Bump and Monitoring and Early Warning in Hujiahe Coal Mine
Table 1
Geometry and mechanical parameters of coal and rock.
| Rock properties | Thickness (m) | Modulus of elasticity (GPa) | Poisson ratio | Cohesive strength (MPa) | Internal friction angle (°) | Tensile strength (MPa) |
| Sand shale | 60 | 6.10 | 0.12 | 4.5 | 27 | 1.76 | Sandstone | 60 | 6.36 | 0.14 | 3.23 | 25 | 3.90 | Mud stone | 60 | 1.86 | 0.13 | 5.67 | 32 | 1.54 | Fine sandstone | 12 | 6.34 | 0.11 | 6.21 | 29 | 2.79 | Silt stone | 5 | 2.32 | 0.10 | 5.13 | 25 | 1.92 | Coal | 23 | 0.81 | 0.02 | 5.43 | 20 | 2.13 | Silt stone | 100 | 2.46 | 0.11 | 2.45 | 31 | 1.63 |
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