Research Article
Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal
Table 4
Table of physical and mechanical parameters of coal strata.
| | Coal bed name | Thick (m) | Bulk modulus (GPa) | Shear modulus (GPa) | Internal friction (°) | Cohesion (MPa) | Tensile strength (MPa) | Apparent density (kg/m3) |
| | Siltstone | 13 | 6.03 | 5.30 | 28.08 | 10.6 | 2.07 | 2516 | | Medium sandstone | 22 | 22.6 | 19.1 | 37.08 | 6.20 | 2.48 | 2304 | | Sandy mudstone | 3 | 18.9 | 9.73 | 31.46 | 10.2 | 1.11 | 2503 | | Coal | 5 | 1.20 | 0.86 | 27 | 8.00 | 1.85 | 1400 | | Sandy mudstone | 4 | 18.9 | 9.73 | 31.46 | 10.2 | 1.11 | 2503 | | Medium sandstone | 8 | 2.73 | 2.31 | 32.54 | 8.00 | 1.17 | 2108 | | Siltstone | 18 | 6.03 | 5.30 | 28.08 | 10.6 | 2.07 | 2516 |
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