Research Article
Research on the Extraction Technology of Gas-Integrated Working-Face in Close Coal Seam Mining in Permafrost Area
Table 3
Characteristic parameters of coal seam and rock stratum.
| | Parameter | Rock stratum | Coal seam | | Direct roof | Waste inclusion | Direct base plate | 3# | 4# | 5# |
| | /GPa | 23.1 | 15.2 | 21.9 | 4.7 | 4.1 | 3.3 | | /MPa | 3.1 | 3.2 | 1.5 | 3.3 | 3.0 | 2.8 | | /° | 33.2 | 31.7 | 37.8 | 24.1 | 23.9 | 23.8 | | 0.24 | 0.20 | 0.24 | 0.32 | 0.30 | 0.29 | | /(kg/m3) | 2610 | 2690 | 2690 | 1320 | 1338 | 1350 | | /(m3/kg) | / | / | / | 3 | | | | 0 | / | / | / | | | | | /MPa | / | / | / | 1.2 | 1.3 | 1.5 | | /(Pa∙s) | / | / | / | | | | | /% | / | / | / | 0.97 | 1.05 | 1.09 | | /% | / | / | / | 15.91 | 12.31 | 9.86 | | /MPa | / | / | / | 0.52 | 0.58 | 0.69 | | / | / | / | 0.01 | 0.01 | 0.01 |
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