Research Article
Study on Law of Overlying Strata Breakage and Migration in Downward Mining of Extremely Close Coal Seams by Physical Similarity Simulation
Table 1
Mechanical properties of coal-rock strata.
| | Number | Lithology | Density (kg/m³) | Shear modulus (GPa) | Bulk modulus (GPa) | Cohesion (MPa) | Friction angle (°) | Tensile strength (MPa) |
| | 1 | Fine sandstone | 2540 | 5.08 | 6.25 | 10.1 | 27 | 6.6 | | 2 | Siltstone | 2640 | 5.82 | 6.09 | 7.9 | 28 | 7.1 | | 3 | Fine sandstone | 2540 | 5.08 | 6.25 | 10.1 | 27 | 6.6 | | 4 | Sandy mudstone | 2200 | 3.6 | 6.0 | 3.0 | 32 | 5.9 | | 5 | Siltstone | 2640 | 5.82 | 6.09 | 7.9 | 28 | 7.1 | | 6 | Mudstone | 2220 | 1.3 | 3.0 | 0.8 | 32 | 5.9 | | 7 | Medium sandstone | 2540 | 5.91 | 6.81 | 10.7 | 31 | 6.5 | | 8 | Mudstone | 2220 | 1.3 | 3.0 | 0.8 | 32 | 5.9 | | 9 | Coal 9 | 1400 | 0.76 | 1.6 | 2.65 | 25 | 1.8 | | 10 | Sandy mudstone | 2200 | 3.6 | 6.0 | 3.0 | 32 | 5.9 | | 11 | Coal 10 | 1400 | 0.76 | 1.6 | 2.65 | 25 | 1.8 | | 12 | Siltstone | 2640 | 5.82 | 6.09 | 7.9 | 28 | 7.1 |
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