微震监测技术在钨矿残矿回采过程中的应用

Application of Microseismic Monitoring Technology in the recovery of residual Tungsten Ores

赣南地区钨矿残矿回采中,采空区分布复杂、地压显现等情况严重制约该区域残矿资源安全、高效回采。为明确残矿回采期间采空区围岩及底部结构地压显现特点,本研究在某钨矿残矿回采区域建立微震监测系统,监测残矿回采过程中采空区围岩体及底部结构微震活动的时空特征。研究表明,残矿回采过程中,微震事件矩震级主要集中在-4.2~-0.7,平均值为-2.1,微震事件释放的能量较小;采空区及底部结构累积视体积成核及视应力集中区域随着回采过程发生变化,31132矿体的回采使得附近31131矿体底部产生较多的微震事件,导致31131矿体底部结构区域应力发生较大集中,且应力集中区域随着回采过程发生动态移动。微震监测技术相比传统点式监测具有很大的优势,为后续残矿回采过程的采空区治理及底部结构加固提供技术参考。

In the recovery of residual tungsten ores in the Southern Jiangxi,the complex distribution of goafs and the appearance of ground pressure seriously restrict the safe and efficient recovery of residual ore resources in the region.In order to clarify the appearance characteristics of ground pressure in the surrounding rock and bottom structure of the goafs during the recovery of residual ores,this study establishes a microseismic monitoring system in the mining area of a residual tungsten ore to monitor the spatiotemporal characteristics of microseismic activity in the surrounding rock and bottom structure of the goafs during the recovery of residual ore.The research shows that in the recovery of residual ore,the moment magnitude scale of microseismic events is mainly-4.2~-0.7,with an average value of-2.1,and the energy released by microseismic events is small;the cumulative apparent volume nucleation and apparent stress concentration area of goaf and bottom structure change with the recovery process,and the recovery of the 31132 ore body results in more microseismic events at the bottom of the nearby 31131 ore body,resulting in a significant concentration of stress in the bottom structure area of the 31131 ore body,and the stress concentration area moves dynamically with the recovery process.Microseismic monitoring technology has great advantages compared to traditional point monitoring,providing technical reference for goaf treatment and bottom structure reinforcement in the subsequent residual ore recovery process.