Research Article.
A Method for Determining Feasibility of Mining Residual Coal above Out-Fashioned Goaf under Variable Load: A Case Study
Table 2
Physical and mechanical parameters of lithology.
| Lithology | Elasticity modulus, E (GPa) | Volume weight, ρ (kg·m−3) | Cohesion, C (MPa) | Tensile strength, σt (MPa) | Friction angle, φ (◦) |
| No. 5 coal seam | 5.1 | 14.00 | 3.0 | 1.2 | 30 | Charcoal mudstone | 10.3 | 24.83 | 5.5 | 4.1 | 32 | Mudstone | 12.4 | 23.69 | 3.5 | 3.5 | 35 | Siltite | 14.5 | 25.34 | 12.2 | 5.1 | 38 | Charcoal mudstone | 17.1 | 24.63 | 3.6 | 3.2 | 32 | No. 8 coal seam | 5.5 | 14.30 | 2.8 | 1.3 | 29 |
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