Table 1 Rock physical and mechanical parameters.
Lithology | Thickness/m | Density/kg·m− 3 | Bulk modulus/GPa | Shear modulus/GPa | Cohesion/MPa | Internal friction angle/° |
|---|---|---|---|---|---|---|
Sandstone | 45 | 2560 | 11.1 | 8.9 | 3.72 | 37.57 |
Medium coarse sandstone | 12 | 2600 | 11.7 | 9 | 6 | 38 |
Siltstone | 51 | 2500 | 10.2 | 8.4 | 3.72 | 36.4 |
Mountain 4 Coal | 1.8 | 1400 | 3.48 | 0.78 | 1.43 | 34.5 |
Clastic rock | 15 | 2600 | 11.7 | 9 | 6 | 38 |
Fine Sandstone | 2.5 | 2620 | 12.2 | 10 | 6.2 | 39 |
Sandy mudstone | 8 | 2340 | 9 | 8 | 5.5 | 36 |
No.2 coal seam | 3 | 1400 | 3.48 | 0.78 | 1.43 | 34.5 |
Gaoling rock | 4.3 | 2100 | 8.2 | 7.6 | 5.5 | 35 |
No.3–5 coal seam | 18 | 1320 | 5.4 | 1.96 | 1.6 | 39 |
Sandy mudstone | 3.3 | 2340 | 9 | 8 | 5.5 | 36 |
No.6 coal seam | 1.1 | 1400 | 3.48 | 0.78 | 1.43 | 34.5 |
Clastic rock | 4.6 | 2560 | 11.1 | 8.9 | 3.72 | 37.57 |
No.7 coal seam | 1.7 | 1400 | 3.48 | 0.78 | 1.43 | 34.5 |
Siltstone | 21 | 2500 | 12.2 | 8.4 | 3.72 | 38 |
