祁东煤矿61、71煤平均间距为44m，属远距离远距离保护层开采，两层煤之间为石英质坚硬砂岩；通过对抽采及未抽采条件下，被保护层71煤层的瓦斯压力、煤层变形量、抽采量、浓度等参数的考察，确定远距离上保护层开采、坚硬顶底板条件下，被保护煤层的瓦斯治理效果及卸压瓦斯抽采规律。%In Qidong coal mine the average distance between 71 and 61 coal is 44 m, and it belongs to remote protective layer mining, be-tween two coal layers is hard quartzose sandstone;By investigating the protected layer of 71 coal seam parameters such as gas pressure,coal seam deformation,gas extraction rate and density in either after extraction or not yet, to determine the remote upper protective layer mining un-der the condition of hard roof and floor and the protected coal seam gas control and pressure relief gas extraction rule.
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