Table 1 Coal and rock physical and mechanical parameters.
Number | Rock layers | Volume weight (kg/m3) | Modulus of elasticity (MPa) | Uniaxial compressive strength (MPa) | Cohesion (MPa) | Internal friction angle (°) |
|---|---|---|---|---|---|---|
1 | Siltstone | 2350 | 6000 | 16.0 | 2.8 | 28 |
2 | Coal | 1350 | 3900 | 10.0 | 2.7 | 23 |
3 | Carbon mudstone | 2500 | 5500 | 18.0 | 4.0 | 23 |
4 | Mudstone | 2470 | 3800 | 20.0 | 2.9 | 30 |
5 | Fine sandstone | 2710 | 5600 | 34.0 | 3.9 | 25 |
6 | Coarse sandstone | 2570 | 4800 | 28.0 | 5.0 | 32 |
7 | Sandstone | 2520 | 4900 | 36.0 | 2.9 | 35 |
8 | Fine sandstone | 2710 | 5600 | 35.0 | 3.7 | 25 |
9 | Conglomerate | 2520 | 4900 | 29.0 | 3.0 | 33 |
10 | Coarse sandstone | 2570 | 4800 | 28.0 | 4.6 | 32 |
