Research Article
Permeability Enhancement of Coal Seam by Lower Protective Layer Mining for Gas Outburst Prevention
Table 1
Protection effect of a protective layer with different mining heights [
13–
30].
| | Mine name | Height (m) | Equivalent layer spacing (times) | Increased multiple of air permeability coefficient | Increased multiple of permeability |
| | Xiangyang Mine | 1.13 | 60.0 | 18.0 | 4 | | Huafeng Mine | 1.10 | 36.0 | 271.6 | 59 | | Changping Mine | 1.22 | 30.9 | 302.0 | 65 | | Sihe Mine | 1.52 | 30.0 | 578.5 | 125 | | Dashu Mine | 1.30 | 25.3 | 776.1 | 168 | | Wulan Mine | 1.84 | 55.6 | 831.0 | 179 | | Wulan Mine | 1.84 | 40.0 | 1 253 | 271 | | Panyi Mine | 1.90 | 35.0 | 1 483 | 320 | | Dingji Mine | 2.19 | 34.1 | — | — | | Pansan Mine | 2.00 | 33.5 | — | — | | Hongling Mine | 1.60 | 31.3 | 2 306.1 | 498 | | Pingdingshan No. 10 Mine | 1.80 | 11.7 | 2 878.9 | 622 | | Wulan Mine | 3.20 | 41.0 | 1 650.0 | 356 | | Wulan Mine | 3.20 | 28.3 | 1 819.1 | 392 | | Guqiao Mine | 2.97 | 25.0 | 1 785.1 | 386 | | New Huainan Mine | 3.50 | 24.4 | 1 895.0 | 409 | | Luling Mine | 3.00 | 23.0 | — | — | | Huainan Mine | 2.50 | 20.3 | 2 867.8 | 919 | | Gubei Mine | 3.00 | 11.1 | — | — |
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