放矿影响下底部结构稳定性监测研究

Study on Stability Monitoring of Bottom Structure Under the Influence of Ore Drawing

为了研究自然崩落法放矿作业对底部结构稳定性的影响,利用矿山地压监测系统的应力、微震监测结果,分析了放矿量对底部结构矿柱应力的影响,研究了放矿过程中底部结构破裂事件的时空分布,利用微震活动性参数对应力监测结果进行了验证。结果表明:放矿作业在时间与空间上的不均衡将导致底部结构局部岩体产生应力集中,通过对应力集中区持续稳定放矿能够调节底部结构的应力分布;微震活动性参数可以反映岩体破坏过程,为放矿过程中评估底部结构地压灾害风险提供参考;借助微震监测系统来圈定应力集中区,从而在大尺度上弥补应力单点监测覆盖面的不足。

In order to study the influence of ore drawing operation of natural caving mining method on the the stability of bottom structure,the influence of ore drawing quantity on the pillar stress of bottom structure was analyzed by using the stress and microseismic monitoring results of mine ground pressure monitoring system.The spatial and temporal distribution of bottom structure fracture events during ore drawing process was studied,and the stress monitoring results were verified by microseismic activity parameters.The results show that the imbalance of ore drawing operation in time and space will lead to stress concentration in the local rock mass of the bottom structure,and the stress distribution of the bottom structure can be adjusted by continuous and stable ore drawing in the stress concentration area.The microseismic activity parameters can reflect the failure process of rock mass,and provide a reference for evaluating the ground pressure disaster risk of the bottom structure during the ore drawing process.With the help of microseismic monitoring system,the stress concentration area has been delineated,so as to make up for the deficiency of stress single point monitoring coverage on a large scale.