Research Article
Mechanism of Coal Burst and Prevention Practice in Deep Asymmetric Isolated Coal Pillar: A Case Study from YaoQiao Coal Mine
Table 3
Main coal and rock mechanics parameters.
| | Lithology | Density (kg·m−3) | Bulk modulus (GPa) | Shear modulus (GPa) | Internal friction angle (°) | Cohesion (MPa) | Tensile strength (MPa) |
| | 7#Coal | 1 410 | 1.9 | 0.9 | 28 | 1.2 | 2.30 | | Fine sandstone | 2 611 | 11.2 | 6.0 | 34 | 7 | 10.40 | | Siltstone | 2 589 | 7.1 | 3.5 | 36 | 8 | 5.04 | | Medium-grained sandstone | 2 661 | 10.2 | 5.0 | 35 | 8 | 8.15 | | Kern stone | 2 636 | 8.0 | 4.0 | 32 | 9 | 6.84 | | Mudstone | 2 580 | 5.8 | 2.8 | 33 | 4 | 2.83 | | Sandy mudstone | 2 590 | 6.3 | 2.9 | 32 | 5 | 3.35 |
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