Research Article
Modeling the Spatial and Temporal Evolution of Stress during Multiworking Face Mining in Close Distance Coal Seams
Table 2
Physical and mechanical parameters of different engineering rockmass.
| | Lithology name | Unit weight (kg/m3) | Bulk modulus (GPa) | Shear modulus (GPa) | Tensile strength (MPa) | Bond force (MPa) | Internal friction angle (°) |
| | 3u coal seam | 1360 | 2.1 | 1.5 | 0.8 | 2.5 | 28 | | 3u coal roof fine grained sandstone | 2650 | 8.6 | 6.9 | 3.1 | 5.8 | 37 | | 3l coal floor silty sand rock | 2670 | 8.1 | 4.2 | 2.0 | 6.4 | 35 | | 3l coal floor sandstone | 2690 | 8.2 | 6.4 | 3.2 | 6.0 | 39 | | 3u and 3l coal seam dirt band | 2620 | 4.0 | 2.5 | 1.0 | 3.2 | 32 | | 3u coal roof sandstone | 2680 | 9.0 | 7.6 | 4.0 | 6.0 | 40 | | 3u coal roof siltstone | 2780 | 8.2 | 4.0 | 3.1 | 6.2 | 38 | | 3l coal floor siltstone | 2600 | 7.5 | 4.5 | 2.0 | 4.2 | 31 | | 3u coal roof siltstone 1 | 2780 | 8.2 | 5.0 | 3.1 | 6.2 | 36 | | 3l coal seam | 1320 | 2.0 | 1.3 | 0.8 | 2.0 | 28 |
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