摘要
罗河铁矿采用盘区阶段空场嗣后充填采矿法,保留大量盘区间柱,同时在单个矿块采矿和充填周期内,一步骤矿房空区顶板暴露面积大且暴露时间长,上覆岩层应力在充填周期内发生转移和重新分布。为了确保动态开采安全,建立高精度微震监测系统,从事件发生时间、事件率、微震矩震级、b值变化、事件簇群等参量,对罗河铁矿某采场空区顶板冒落进行了反演分析。结果表明,微震监测系统能够监测岩体破裂动态变化过程,并提前3~7 d发出预警信息,能够助力矿山的安全监管。
Luohe Iron Mine adopts the panel stage open stope and subsequent filling mining method,which retains a large number of panel interval pillars.At the same time,in the mining and filling cycle of a single ore block,the exposed area of the roof of the goaf in one step is large and the exposure time is long,and the stress of the overlying strata is transferred and redistributed in the filling cycle.In order to ensure the safety of dynamic mining,a high-precision microseismic monitoring system is established.From the parameters of event occurrence time,event rate,microseismic moment magnitude,b value change,event cluster and so on,the roof caving of a goaf in Luohe iron mine is inversely analyzed.The results show that the microseismic monitoring system can monitor the dynamic change process of rock mass fracture and send out early warning information 3~7 days in advance,which can help the safety supervision of mines.
作者
袁锦锋
董亚宁
郏威
刘博
YUAN Jinfeng;DONG Ya'ning;JIA Wei;LIU Bo(Anhui Masteel Luohe Mining Co.,Ltd;Changsha Institute of Mining Research Co.,Ltd)
出处
《现代矿业》
CAS
2022年第7期224-228,共5页
Modern Mining
关键词
顶板冒落
微震监测
事件率
事件簇群
roof caving
microseismic monitoring
event rate
event cluster
