近距离煤层群开采上保护层被保护层卸压瓦斯治理实践  

Practice of Pressure Relief Gas Control of Upper Protective Layerand Protected Layer in Close Distance Coal Seam Group Mining

作　　者：李丽[1] 陈志平[2] 张以晨 焦雯淼 LI Li;CHEN Zhiping;ZHANG Yichen;JIAO Wenmiao(Changchun Institute of Technology,Changchun Jilin 130021,China;Daxing Coal Mine of Tiefa Coal Group,Diaobingshan Liaoning 112700,China)

机构地区：[1]长春工程学院,吉林长春130021 [2]铁法煤业集团大兴煤矿,辽宁调兵山112700

出　　处：《安全》2021年第6期61-68,共8页Safety & Security

基　　金：长春工程学院大学生创新创业训练计划项目(202111437240)。

摘　　要：为保障突出矿井近距离煤层群安全开采,本文基于上保护层开采时下邻近煤层卸压瓦斯治理的重要性,探讨采场动压影响下围岩变化与卸压瓦斯解吸运移的时空关系,研究瓦斯涌出形态和控制措施。结果表明:煤层组开采上保护层时,伴随工作面推进,底板煤岩系表现出时空滞后的蠕变特性;邻近层卸压瓦斯涌出按其对应工作面位置的活跃程度呈现出“四带”特征;被保护层卸压涌出占总瓦斯涌出量的70%以上,直接对被保护层进行目标抽采瓦斯是实现卸压瓦斯抽采最大化的最佳途径;在使用底板瓦斯道施工穿层钻孔抽采被保护层卸压瓦斯时,根据巷道顶板瓦斯层流情况,确定全负压通风并保持风速1.1m/s以上是保障安全作业环境优化条件。In order to ensure the safe mining of coal seams group at close distances in outburst mines,on the basis of the importance of relief gas treatment in adjacent coal seam when the upper protective layer is mined,the temporal and spatial relationship between the change of surrounding rock and desorption and migration of pressure relief gas under the influence of stope dynamic pressure is discussed,gas emission patterns and control measures are researched.The results show that when mining upper protective layer of coal seam group,with the advance of working face,the floor coal and rock series represent the creep characteristics of time and space lag;that the pressure relief gas emission from adjacent strata presents the"four zones"characteristics according to the active degree of the corresponding working face;that the pressure relief emission of the protected layer accounts for more than 70%of the total gas emission and the best way for maximizing the pressure relief gas drainage is to extract gas directly from the protected layer;and that when extracting pressure relief gas from protected layer through construct transverse layer drilling of floor gas channel,the optimal conditions for ensuring a safe working environment are to keep full negative pressure ventilation and maintain the wind speed above 1.1m/s according to the roadway roof gas laminar flow.

关 键 词：开采保护层 瓦斯涌出 近距离煤层群 卸压瓦斯抽采 

分 类 号：X936[环境科学与工程—安全科学]