红庆河煤矿双煤柱开采矿压显现特征

Mine pressure features of double panel-pillar mining in Hongqinghe Coal Mine

由于红庆河煤矿首采区3-1103工作面和3-1101采空区之间留设双区段煤柱和顶板岩层结构的影响,3-1103工作面回采期间新辅助运输巷冲击危险水平高、动力显现明显,对安全生产构成极大威胁。采用数值模拟和统计分析的方法研究了双煤柱开采矿压显现特征。数值模拟结果表明:柱区应力集中水平高,1#煤柱主要威胁废弃的3-1103工作面旧辅助运输巷,2#煤柱主要威胁正在使用的3-1103工作面新辅助运输巷;随着2#煤柱宽度的增加,1#煤柱、2#煤柱和3-1103新辅助运输巷处的应力均逐渐降低,旧辅助运输巷两帮应力下降较缓慢,新辅助运输巷两帮应力下降较快;3-1103工作面回采引起的矿震主要集中在煤柱区,104 J以上矿震超前工作面平均约214 m,水平距离煤柱平均约35 m。

Due to the existence of double panel-pillar between 3-1103 working face and 3-1101 working face in Hongqinghe Coal Mine,the new auxiliary transportation roadway of 3-1103 working face is faced with high burst hazard,which poses a threat to the safe production.Numerical simulation and statistics analysis are carried out to investigate the mine pressure features of double panel-pillar area and the active control of burst hazard.The simulation results show that:panel-pillar area is of high stress concentration with 1#pillar and 2#pillar posing a threat to the abandoned old auxiliary roadway and the new auxiliary roadway,respectively;with the increase of 2#pillar,the stress in 1#pillar,2#pillar and beside the new auxiliary transportation roadway decreases;the stress in coal mass beside the new auxiliary transportation roadway decreases faster than that beside the old auxiliary transportation roadway;seismic events induced by 3-1103 working face mainly accumulates in the pillar area;the seismic events with energy more than 104 J mainly occurs at about 214 m ahead of the working face,which is about 35 m on average away from the pillar.