Research Article
Influence of Upper Seam Extraction on Abutment Pressure Distribution during Lower Seam Extraction in Deep Mining
Table 3
Mechanical parameters of rock layer in the numerical model.
| | Rock layer | Density (kg/m3) | Young’s modulus (GPa) | Poisson ratio | Friction angle (°) | Tensile strength (MPa) | Cohesion (MPa) |
| | Sandstone | 2690 | 12.5 | 0.22 | 32 | 6.5 | 10.5 | | Siltstone | 2650 | 10.0 | 0.22 | 36 | 5.5 | 8.5 | | Pack sand | 2740 | 14.5 | 0.20 | 36 | 7.5 | 12.5 | | Mudstone | 2560 | 8.0 | 0.28 | 28 | 3.5 | 5.5 | | Coal seam | 1340 | 4.5 | 0.32 | 20 | 2.5 | 3.6 |
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