Research Article
Analysis of Stability Factors of Roadway Roof and Determination of Unsupported Roof Distance
Table 1
Mechanical parameters of the coal roof and floor.
| | No. | Lithology | Thickness (m) | Density (kg/m³) | Bulk modulus (GPa) | Shear modulus (GPa) | Internal friction angle (°) | Cohesion (MPa) |
| | 5 | Fine sandstone | 7.74 | 2700 | 8.35 | 7.1 | 35 | 3.75 | | 4 | Sandy mudstone | 1.15 | 2500 | 5.2 | 3.4 | 30 | 2.05 | | 3 | 8 coal | 3.54 | 1400 | 1.5 | 0.63 | 23 | 0.72 | | 2 | Mudstone | 3.01 | 2400 | 3.58 | 1.53 | 23 | 1.17 | | 1 | Siltstone | 4.35 | 2500 | 6.5 | 6.74 | 32 | 3.15 |
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