保护层开采是区域性防治煤与瓦斯突出等动力现象的有效措施.针对平顶山矿区煤层群开采的现状,对远距离下保护层的开采问题进行探讨.依据平顶山矿区某矿丁、戊组煤(间距90 m)的开采现场,对下保护层开采后其上覆远距离煤层的卸压效果进行了研究.通过现场矿压观测及瓦斯参数测试,结果表明:平顶山矿区虽煤层有效间距较大,但卸压效果依然明显,矿压显现降低,煤层透气性系数显著增加1 000倍左右,也充分表现了煤层卸压增透的特征,并采取合理的卸压瓦斯抽采方法,可以消除煤层突出危险性.%Protecting stratum mining is an effective measure for regional prevention of the dynamic phenomenon of coal and gas outburst. Against the status of multi seam mining in Pingdingshan mining area, especially, the problem of far-distance protecting stratum mining are discussed. Some mine with the ding, wu group seams( spacing ninety meters) mining site as the basis, depressurization efficiency of overlying far-distance multi seam mining are researched after mining protecting strata. Strata by field observation and testing of gas parameters, the results show:although the large effective distance between seams, but still the effect of relief is obvious, strata behavior reduced,permeability coefficent in coal seam increased one thousand times, the effect of pressure-relief and permeability improvement was showed, and take reasonable pressure relief gas drainage method, the danger of coal outburst can eliminated.
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