Table 1 Mechanical parameters of coal rock.
Rock formation | Thickness (m) | Bulk Modlus (GPa) | Shear modulus (GPa) | Density (kg.m−3) | Cohesion (MPa) | Tensile strength (MPa) | Dilation angle (°) |
|---|---|---|---|---|---|---|---|
fine sandstone | 13.8 | 5.1 | 3.4 | 2500 | 5 | 4.2 | 6 |
61 coal seam | 0.5 | 0.9 | 0.4 | 1250 | 1.8 | 1.5 | 3 |
mudstone | 4.3 | 5.1 | 3.4 | 2500 | 5 | 4.2 | 6 |
fine sandstone | 11.7 | 7.1 | 4.4 | 2500 | 9 | 8 | 10 |
mudstone | 5.4 | 5.1 | 3.4 | 2500 | 5 | 4.2 | 6 |
71 coal seam | 3.5 | 0.9 | 0.4 | 1250 | 1.8 | 1.5 | 3 |
mudstone | 1.7 | 5.1 | 3.4 | 2500 | 5 | 4.2 | 6 |
fine sandstone | 5 | 7.1 | 4.4 | 2500 | 9 | 8 | 10 |
