Research Article
Network Design Mode of In-Seam Gas Extraction Parameters Using Mathematical Modelling—Take Tangan Colliery as an Example
Table 3
Gas drainage effect of each extraction unit in working face 3307.
| Extraction unit | 1 | 2 | 3 | 4 | 5 | 6 |
| Area length/m | 430 | 301 | 205 | 146 | 103 | 242 | Extraction time/d | 350 | 242 | 169 | 119 | 83 | 58 | /m | 6 | 6 | 5 | 4.5 | 4 | 2 | /m | 6 | 5 | 4 | 3.5 | 2.5 | 1 | Number of fracturing boreholes | 49 | 34 | 30 | 24 | 21 | 97 | Number of extraction boreholes | 98 | 67 | 60 | 48 | 41 | 195 | Average pure volume of fracturing borehole/(m3/min) | 0.02 | 0.023 | 0.026 | 0.034 | 0.04 | 0.042 | Average pure volume of extraction borehole/(m3/min) | 0.019 | 0.02 | 0.022 | 0.027 | 0.03 | 0.03 | Total extraction volume/(×107m3) | 1.43 | 0.74 | 0.51 | 0.36 | 0.25 | 0.83 | Gas extraction rate/% | 33.50% | 26.40% | 25.10% | 25.00% | 25.00% | 34.50% |
|
|