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采煤工作面煤体受支撑压力作用产生的塑性变形,在煤壁前方形成孔(裂)隙重新生成区、孔(裂)隙微闭合区和原始孔(裂)隙区3个区域。根据三交河煤矿2-508工作面塑性区宽度计算结果,确定出各个区域的具体范围。在3个区域采取特殊的钻孔布置形式和注水参数进行注水试验后,煤体水分从1.07%增加到2.51%;工作面总粉尘降尘效率达到74%,呼吸性粉尘降尘效率达到56%。利用工作面煤体不同孔(裂)隙发育特性,采取有针对性的煤层注水工艺参数可有效提高煤层注水效果。
The plastic deformation caused by the supporting pressure of the coal face in coal mining face forms three zones of pore (crack) regeneration, micro-closed zone of pore (crack) and primary pore (crack) in front of the coal wall. According to the calculation result of the plastic zone width of 2-508 face in Sanjiaohe coal mine, the specific range of each zone is determined. After water injection test with special drilling arrangement and water injection parameters in 3 areas, the moisture content of coal increased from 1.07% to 2.51%. The dust reduction efficiency of total dust on the working face reached 74% and the dust reduction efficiency of respirable dust reached 56%. By exploiting the development characteristics of different pores (clefts) in the coalface of coal face, adopting targeted water injection process parameters can effectively improve the water injection effect of the coal seam.