特厚煤层综放开采回采巷道钻孔应力监测研究

Research on Drill Hole Stress Monitoring in Mining Roadway of Fully Mechanized Caving Mining in Extremely Thick Coal Seam

以大同矿区同家梁矿为研究背景,通过对回采巷道深部围岩的钻孔应力监测,5103巷位于侏罗系煤柱下的1~#监测断面钻孔应力变化幅度较大,受临近采空区顶板运动及上部侏罗系煤柱影响,煤柱应力发生跃迁频繁。5103巷不同深度位置的煤柱受力状态不同,越靠近采空区侧煤柱受力越大,相对应力值最大达5MPa,伴随邻近工作面的周期来压,越靠近采空区的煤柱应力周期性跃升越明显。

Taking Tongjialiang Coal Mine in Datong mine area as the research background, through the monitoring of the borehole stress in the deep surrounding rock of the mining roadway, the stress changes of the 1~# monitoring section under the Jurassic coal pillar are large, and the stress of the coal pillar occurs frequently by the roof movement in the near goaf and the upper Jurassic coal pillar. The stress state of coal pillar in different depth of 5103 lanes is different, the closer to the side coal pillar, the greater the stress of the side coal pillar, the maximum value of the stress reaches 5 MPa. With the periodic pressure of the adjacent working face, the more obvious the stress periodic jump of the coal pillar is closer to the goaf.