Study on Gas Control Methods Optimization for Mining Safety

Figure 7

Subareas of overlying strata along advancing direction in mining panel. (A) Intact zone (a-b). (B) Separation zone (b-c). (C) Recompaction zone (c-d). (I) Caved zone. (II) Fractured zone. (III) Bending subsidence zone.The gas drainage method with surface wells is a major means of gas control in Haizi Coal Mine. First well is designed to be 100–150 m away from open-off cut and located in the middle of mining panel. Space between surface wells is 300 m. Two surface wells are designed in No. 2 1024 panel. The schematic diagram of surface borehole’s layout is shown in Figure 8.