摘要
以峻德煤矿17#煤层回采期间冲击地压显现频发为工程背景,并结合"11.14"冲击地压事故对峻德煤矿三水平北17#煤层三四区二段工作面冲击危险性进行了深入研究。结果表明:"11.14"冲击地压事故发生前3d,存在矿震能量小幅度"升-降"的波动变化过程;冲击发生前能量密度云核心区已经开始显现,且核心区显现位置坐落于工作面上侧;数值模拟和理论分析结果验证了工作面回风巷超前段因应力叠加容易形成高集中静载荷,在回采引起的动载扰动作用下,最终发生了冲击地压事故。研究结果可以为倾斜煤层工作面后续回采阶段卸压防冲预防工作提供一定的借鉴。
Taking the frequent rock burst in No.17 coal seam of Junde Coal Mine as the engineering background,and combining with the"11.14"rock burst accident,the rock burst risk of the second section of No.3,No.17,No.34 area in the north of the third level is studied in depth.The results show that three days before the 11.14 rock burst accident,there is a small fluctuation process of"rise-fall"of the energy of the mine tremor;the core area of the energy density cloud has begun to appear before the impact,and the core area is located on the top of the working face;the numerical simulation and theoretical analysis results verify that the leading section of the working face is easy to form a highly concentrated static load because of the stress superposition.Under the action of dynamic load disturbance caused by mining,rock burst accident finally occurred.The research results provide some reference for pressure relief and scour prevention in the following mining stage of inclined coal seam face.
作者
徐仁桂
XU Ren-gui(Inner Mongolia Coal Science Research Institute Co.,Ltd.,Hohhot 010010,China)
出处
《煤炭工程》
北大核心
2020年第2期64-68,共5页
Coal Engineering
关键词
倾斜煤层
冲击地压
微震监测
数值模拟
inclined coal seam
rock burst
microseismic monitoring
numerical simulation
