基于微震监测多方法的采空区群稳定性分析

Multi-method stability analysis on large-area goaf group based on micro-seismic monitoring

精准分析采空区群的稳定性对于矿山安全生产有着重要的意义。以内蒙古白音诺尔铅锌矿地下采空区群为研究背景,首先采用三维激光扫描技术,建立地下复杂的采空区三维可视化模型;在此模型基础上应用Mathews图解法对空区顶板及上盘稳定性进行评价;并通过数值模拟方法,分别从采空区的位移场、应力场及塑性区分布,分析空区的稳定性状态;由前述工作指导设计了微震系统的传感器空间布置,最后从微震事件空间分布规律角度分析了采空区群的稳定状态。研究结果表明:3-5#和3-6#空区稳定性较差,3-2#、3-4#及3-7#空区稳定性一般,其他空区稳定性较好。研究成果可帮助矿山生产规避风险,同时也为后续采空区处理提供技术支撑。

Accurate analysis of the stability of goaf groups is of great significance for mine safety production.This article takes the underground goaf group of Baiyinnuoer lead-zinc mine in Inner Mongolia as the research background.Firstly,three-dimensional laser scanning technology is used to establish a three-dimensional visualization model of the complex underground goaf.Based on this model,the Mathews graphical method is applied to evaluate the stability of the goaf roof and hanging wall;Through numerical simulation methods,analyze the stability state of the goaf from the displacement field,stress field,and plastic zone distribution of the goaf;The previous work guided the design of the sensor space layout for micro-seismic systems.Finally,the stable state of the goaf group was analyzed from the perspective of the spatial distribution law of micro-seismic events.The research results show that the stability of 3-5#and 3-6#empty areas is poor,the stability of 3-2#,3-4#,and 3-7#empty areas is general,and the stability of other empty areas is good.The research results can help mine production avoid risks,and also provide guidance for the next step of filling method transformation.