近距离煤层遗留煤柱扰动下巷道合理布置方法研究  

Research on the Reasonable Layout Method of Roadway under the Disturbance of Coal Pillar Left in the Contiguous Coal Seam

作　　者：杨勇勇 YANG Yong-yong(Shanxi Liulin Dazhuang Coal Mine Co., Ltd., Lliang 033300,China)

机构地区：[1]山西柳林大庄煤矿有限责任公司,山西吕梁033300

出　　处：《煤》2022年第7期10-13,共4页Coal

基　　金：山西省应用基础研究计划面上项目(20210302123148)。

摘　　要：针对某矿大采高工作面开采中上部遗留煤柱影响下伏煤层巷道稳定性的问题,采用理论分析与数值模拟方法,研究了煤柱对底板应力的扰动特征,分析了下伏煤层合理巷道的布置方法。研究结果表明:上部遗留煤柱对底板的破坏深度为55 m,水平破坏影响距离为46.8 m,下伏煤层巷道布置在该破坏影响范围内,支撑压力表现为“驼峰”形变化特征,作用于下伏煤层的应力峰值达12.5 MPa,超过了原岩应力,进而导致巷道变形严重。据此,研究提出在距上覆煤层遗留煤柱边界50 m处开掘新回风巷道,将原3105回风巷道作为卸压巷道的合理布置方法,结合煤壁钻孔卸压与巷道加强支护方法,可保障巷道的稳定性,实现工作面安全回采。Aiming at the influence of the coal pillar left in the middle and upper part of the working face with large mining height on the stability of the roadway of the underlying coal seam,the theoretical analysis and numerical simulation methods are used to study the stress disturbance characteristics of the coal pillar on the floor,and the reasonable roadway layout of the underlying coal seam is analyzed.The research results show that the damage depth of the upper left coal pillar to the floor is 55 m,and the horizontal damage influence distance is 46.8 m.The underlying coal seam roadway is arranged in the damage influence range,and the support pressure shows the change characteristic of“hump”,which acts on the lower part.The stress peak of the overburden coal seam is 12.5 MPa,which exceeds the original rock stress,which leads to serious deformation of the roadway.Based on this,the research proposes to excavate a new air return roadway 50 m away from the coal pillar boundary of the overlying coal seam section,using the original 3105 air return roadway as a reasonable arrangement method for the pressure relief roadway,and combining the coal wall drilling pressure relief and roadway reinforcement support.The method can ensure the stability of the roadway and realize the safe mining of the working face.

关 键 词：近距离煤层 煤柱 巷道位置 数值模拟 

分 类 号：TD822.2[矿业工程—煤矿开采]