Research Article
Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal
Table 1
Table of physical and mechanical parameters of coal strata.
| | Coal bed name | Thickness (m) | Bulk modulus (Pa) | Shear modulus (Pa) | Angle of internal friction (°) | Cohesion (Pa) | Tensile strength (Pa) | Density (kg/m3) |
| | Siltstone | 13 | 6.03e9 | 5.30e9 | 28.08 | 1.06e7 | 2.07e6 | 2516 | | Medium sandstone | 22 | 2.26e10 | 1.91e10 | 37.08 | 6.20e6 | 2.48e6 | 2304 | | Sandy mudstone | 3 | 1.89e10 | 9.73e9 | 31.46 | 1.02e7 | 1.11e6 | 2503 | | Coal | 5 | 1.20e9 | 8.60e8 | 27 | 8.00e6 | 1.85e6 | 1400 | | Sandy mudstone | 4 | 1.89e10 | 9.73e9 | 31.46 | 1.02e7 | 1.11e6 | 2503 | | Medium sandstone | 8 | 2.73e9 | 2.31e9 | 32.54 | 8.00e6 | 1.17e6 | 2108 | | Siltstone | 18 | 6.03e9 | 5.30e9 | 28.08 | 1.06e7 | 2.07e6 | 2516 |
|
|
