Research Article
Research on the Reasonable Coal Pillar Width and Surrounding Rock Supporting Optimization of Gob-Side Entry under Inclined Seam Condition
Table 1
Testing result of coal samples about physical and mechanical properties.
| Types | Density (g·cm−3) | Bulk modulus (GPa) | Shear modulus (GPa) | Cohesion (MPa) | Internal friction angle (°) | Thickness (m) |
| Fine sandstone | 2.70 | 13.3 | 10 | 10.2 | 37 | 5.0 | Medium sandstone | 2.34 | 12.3 | 9.1 | 5.2 | 37 | 13.0 | Fine sandstone | 2.70 | 13.3 | 10 | 10.2 | 37 | 5.0 | Siltstone | 2.65 | 9.1 | 7.8 | 7.2 | 34 | 5.0 | Carbon mudstone | 2.54 | 8.4 | 5.7 | 8.0 | 36 | 1.5 | 2# coal | 1.30 | 5.0 | 2.1 | 1.68 | 28 | 8.5 | Siltstone | 2.65 | 9.1 | 7.8 | 7.2 | 34 | 5.0 | Mudstone | 2.25 | 6.8 | 4.8 | 6.2 | 26 | 2.0 | Fine sandstone | 2.70 | 13.3 | 10 | 10.2 | 37 | 5.0 |
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