Research Article
A Supporting Design Method When Longwall FaceStrides across and Passes through a Roadway
Table 2
Coal-rock layers and mechanical parameters used in the numerical model.
| | Rock strata | Thickness (m) | Density (kg/m3) | Bulk modulus (GPa) | Shear modulus (GPa) | Friction angle (deg.) | Cohesion (MPa) | Tensile strength (MPa) |
| | Coarse sandstone | 30.0–86.5 | 2580 | 10.3 | 8.4 | 37 | 4.3 | 5.9 | | Fine sandstone | 9.0 | 2650 | 7.4 | 4.8 | 38 | 2.2 | 1.5 | | Mudstone | 1.5 | 2540 | 2.3 | 1.2 | 27 | 1.2 | 0.8 | | 7# coal seam | 5.0 | 1400 | 0.3 | 0.12 | 18 | 0.3 | 0.15 | | Mudstone | 3.4 | 2420 | 2.4 | 1.3 | 32 | 1.1 | 1.2 | | Fine siltstone | 14.6 | 2500 | 3.0 | 1.9 | 35 | 2.4 | 4.3 | | Coarse sandstone | 30.0–86.5 | 2660 | 8.1 | 4.9 | 37 | 2.8 | 2.2 |
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