矿山厂地压灾害微震监测预警参数分析研究

Study on Early Warning Parameters of Microseismic Monitoring for Ground Pressure Disaster in a Mine Plant

为了研究矿山监测范围内多参量预警技术,总结适合于矿山的预警阈值。基于矿山厂2018年建立的30通道微震监测系统,采用人工爆破试验校正系统设置参数;然后通过对采集数据的筛选处理,构建了有效微震事件库,并结合现场地压活动状况,对微震事件从微震时间序列、空间分布与演化、定量地震学参数等方面展开分析研究。结果表明:可以将时序集中度高值区Q_(时)>1、震中集中程度Q_(空)低值区Q_(空)≤100、地震学参数b≤0.27、β_(n)高值区β_(n)≥5.0和η高值区η≥1.05确定为矿山厂微震监测系统的预警阈值,从而实现矿山厂地压灾害监测预警的目标。

In order to study the early warning technology with multi parameters in the mine monitoring range,the early warning threshold suitable for the mine was summarized.Based on a 30-channel microseismic monitoring system established by a mine plant in 2018,the correction system for manual blasting test was used to set parameters.Then,an effective microseismic event library was built by screening and processing the collected data.Combined with the on-site ground pressure activities,the microseismic events were analyzed and studied from the aspects of microseismic time series,spatial distribution and evolution,quantitative seismological parameters,etc.The results show that the early warning threshold of the microseismic monitoring system in this mine plant can be determined as the time sequence concentration in the high value area Q_(时)>1,the epicenter concentration in the low value area Q_(空)≤100,the seismological parameter b≤0.27,β_(n) in the high value areaβ_(n)≥5.0andηin the high value areaη≥1.05.Therefore,the goal of monitoring and early warning of ground pressure disasters in this mine plant can be achieved.