摘要
根据会泽铅锌矿复杂地质状况,建立了一套24通道全数字微震监测系统,对深部岩体开采诱发微震事件进行监测,得到岩体随开采过程诱发微震事件的参数,包括b值、震级和事件数等.推导出b值与容量维Df之间的关系式为Df=2b,分析了容量维Df随时间变化和采场垮冒的关系.分析结果显示:岩体失稳破坏和Df值变化密切相关.随着开采扰动变化,由应力集中引起局部岩体裂纹压密、萌生和扩展,Df表现为增加后保持相对平静的现象,表明岩体裂纹的粗糙度在增加;一旦岩体破坏引发动力灾害,Df值急剧下降,表明岩体裂纹的粗糙度在降低,岩体破坏加速;结合现场实践,分析得出Df值越小,发生岩体破坏的概率越大.
Based on complex geological conditions in Huize Lead Zinc Mine,a digital 24-channel microseismic monitoring system was established to monitor microseismic events in deep mining.In the monitoring period,microseismic parameters were recorded such as b values,magnitude and the number of microseismic events.The relation of Df =2b was deduced between capacity dimension Df and b values.After analyzing the monitoring data,the changes of Df values with time and stope collapse were determined.The results show that rockmass failure is closely related with Df values.With the change of mining disturbance,the stress concentration of local rockmass induces crack compaction,initiation and propagation,meantime the Df values increase and then stay relatively quiet,meaning that the crack roughness of rockmass is increasing.Once dynamic disasters are caused by rock mass failure,the Df values abruptly decrease,which means that the crack roughness of rockmass reduces and it leads to the acceleration of rockmass instability.Combining with site examination,it is concluded that the probability of rock failure increases with decreasing Df values.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第11期1379-1382,共4页
Journal of University of Science and Technology Beijing
基金
国家"十一五"科技支撑计划资助项目(No.2006BAB02A01)
关键词
金属矿山
深井开采
岩体失稳
微震监测
容量维
metal mine
deep mining
rockmass instability
microseismic monitoring
capacity dimension
