摘要
孤岛工作面的顶板运动和应力场变化十分复杂,这两者很大程度上决定了工作面能否安全回采。以兴隆庄煤矿10304工作面冲击地压防治为例,针对工作面高应力集中区域,采取煤层大直径钻孔卸压措施,配合微震等监测手段有效降低了冲击危险。研究表明:煤层大直径钻孔改善了煤岩体应力分布,卸压效果良好;工作面顶板破断垮落较充分,顶板微震活动集中在上覆岩层50m范围,且大能量事件数量较少;工作面整体微震活动受构造、煤柱以及老巷群影响较大。
The roof movement and stress field change of isolated island working face are very complex,which largely determine whether the working face can be safely mined.Taking the prevention and control of rockburst in the 10304 working face of Xinglongzhuang Coal Mine as an example,aiming at the high stress concentration area of the working face,the pressure relief measures of large-diameter drill holes in the coal seam,together with the monitoring means such as microseism,have effectively reduced the impact risk.The research shows that the large-diameter borehole in coal seam improves the stress distribution of coal and rock mass,and the pressure relief effect is good;The roof of the working face is fully broken and collapsed,and the microseismic activity of the roof is concentrated within 50m of the overlying strata,and the number of high-energy events is relatively small;The overall microseismic activity of the working face is greatly affected by the structure,coal pillar and old roadway group.
作者
路亚军
吕经超
白超强
LU Yajun;LV Jingchao;BAI Chaoqiang(Xinglongzhuang Coal Mine of Yankuang Energy Group Co.,Ltd,Yanzhou272100,China;University of Science and Technology Beijing,Beijing 100083,China)
出处
《煤矿现代化》
2023年第6期21-24,共4页
Coal Mine Modernization
关键词
冲击地压
孤岛工作面
微震监测
覆岩结构
rock burst
islands face
microseismic monitoring
overburden structure
