Research Article
Study on Stress Relief of Hard Roof Based on Presplitting and Deep Hole Blasting
Table 1
Main rock model parameters.
| | Group name | Lithology | Bulk (GPa) | Shear (GPa) | Cohension (MPa) | Friction (°) | Tension (MPa) | Density (kg/m3) |
| | Main roof | Sandstone | 6.11 | 3.15 | 3.6 | 32 | 2.95 | 2600 | | Immediate roof | Sandy mudstone | 5.61 | 3.97 | 3 | 31 | 3.33 | 2577 | | False roof | Carbon mudstone | 3.03 | 1.32 | 1 | 23 | 1.3 | 1368 | | Coal seam | 2# coal | 3.03 | 1.32 | 1 | 23 | 1.68 | 1368 | | Immediate floor | Mudstone | 9.53 | 5.17 | 2.8 | 32 | 3.5 | 2624 | | Main immediate | Siltstone | 1.01 | 6.05 | 3 | 38 | 6.06 | 2625 |
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