Research Article
Study of the Stability Control of the Rock Surrounding Double-Key Strata Recovery Roadways in Shallow Seams
Table 1
Physical and mechanical parameters of the coal stratum.
| Rock formations | Density (kg·m−3) | Friction angle (°) | Tensile strength (MPa) | Shear modulus (GPa) | Bulk modulus (GPa) | Cohesion (MPa) |
| Unconsolidated stratum | 1760 | 20 | 0.1 | 0.0071 | 0.0125 | 0.019 | Coarse sandstone | 2586 | 43 | 11.5 | 14.0 | 18.0 | 3.8 | Mudstone | 2545 | 30 | 1.8 | 2.8 | 4.3 | 0.7 | Pelitic siltstone | 2540 | 35 | 1.0 | 1.6 | 2.7 | 2.0 | Peat mudstone | 2699 | 39 | 2.5 | 2.8 | 2.9 | 1.4 | Medium coarse sandstone | 2590 | 36 | 6.0 | 22.0 | 18.7 | 12.1 | Silty mudstone | 2500 | 32 | 1.0 | 1.0 | 2.0 | 2.8 | #2 coal seam | 1380 | 32 | 0.5 | 2.3 | 5.0 | 1.3 | Medium sandstone | 2530 | 29 | 2.0 | 4.7 | 7.5 | 7.5 | #3 coal seam | 1390 | 28 | 0.5 | 2.3 | 5.0 | 1.0 | Pelitic siltstone | 2650 | 38 | 1.8 | 4.9 | 10.8 | 2.8 |
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