摘要
常村矿21132工作面冲击矿压多发生在下巷超前支承压力区和"Z型"煤柱区。研究认为,受外错煤柱产生的高应力影响,下巷冲击次数高于上巷;受外错煤柱产生的高应力与延伸工作面侧向支承压力叠加影响,"Z型"煤柱区冲击频发。数值模拟结果显示,21132下巷接近"Z型"煤柱区时,水平应力由19.5MPa增加到22MPa,垂直应力变为原岩应力的2.5倍,解释了"Z型"煤柱区冲击频发的原因,预示着工作面推进至"Z型"煤柱区附近时冲击危险性将升高。
Rock-bursts usually occurred advanced abutment pressure zone of lower roadway and ＂Z-style＂ coal-pillar zone of 21132 mining face in Changchun Colliery. Research showed that rock-burst number of lower roadway was higher than that of upper roadway be- cause lower roadway was influenced by coal-pillar＇ s high stress. Rock-burst occurred frequently in ＂Z-style＂ coal-pillar zone which in- fluenced by overlying stress of coal-pillar and side abutment pressure. Numerical simulation showed that horizontal stress increased to 22MPa from 19. 5MPa and vertical stress reached 2. 5 times of in-situ stress when 21132 lower roadway was near to ＂Z-style＂ coal-pil- lar, which indicated rock-burst danger increased when mining face was near to ＂Z-style＂ coal-pillar zone.
出处
《煤矿开采》
北大核心
2013年第1期84-88,共5页
Coal Mining Technology
关键词
“Z型”煤柱
数值模拟
冲击矿压
支承压力
＂Z-style＂ coal-pillar
numerical simulation
rock-burst
abutment pressure
