Research Article
Dynamic Evolution Law of Overburden Rock in Shallow-Buried Super-High Fully Mechanized Working Face and Determination of Support Strength
Table 4
Physical and mechanical parameters of 1-2 coal seam and its roof and bottom slate in Shangwan coal mine.
| | Name of coal and rock | True density (kg/m3) | Apparent density (kg/m3) | Compressive strength (MPa) | Tensile strength (MPa) | Elastic modulus (GPa) | Poisson’s ratio | Internal friction angle (°) | Cohesion (MPa) |
| | Basic roof | 2664 | 2537 | 22.79 | 6.72 | 30.94 | 0.27 | 34.30 | 4.99 | | Direct roof | 2658 | 2516 | 23.80 | 6.30 | 40.31 | 0.23 | 38.49 | 5.26 | | Coal seam | 1429 | 1339 | 15.98 | 2.10 | 23.87 | 0.25 | 34.66 | 2.32 | | Coal floor | 2786 | 2420 | 16.11 | 6.37 | 47.35 | 0.22 | 33.22 | 7.63 |
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