基于微震监测的金属矿山地压规律分析及监测研究

Analysis and Monitoring Research on Ground Pressure Law of Metal Mines Based on Microseismic Monitoring

为探寻金属矿山地压活动规律,及时对其进行监测,以中关铁矿为研究对象,设计并布置了12通道高精度微震监测系统,通过多参数综合分析明确了微震活动性特征,进而揭示了地压活动规律,应用多指标综合分析得到了中关铁矿地压活动活跃期。结果表明:设计布置的微震监测系统校准了监测精度在其规定区域内时间、空间上的准确性结果与现场实际一致,监测结果有效可靠;结合微震事件发生位置和事件数,对微震活动性、累积视体积和能量指数等多参数进行分析,发现在同一时间轴下各参数变化规律及显著特征分布基本一致,在监测期间地压活动较为频繁;通过微震b值、EV值,确定了中关铁矿地压活动活跃期为2022-08-28—08-30、2022-09-14—09-17和2022-09-22—09-28,应加强观测,以便及时响应,这为基于微震监测技术在地压活动方面的监测提供了技术支撑。

In order to explore the law of ground pressure activity in metal mines and monitor it in a timely manner,a 12 channel high-precision microseismic monitoring system was designed and arranged with Zhongguan Iron Mine as the research object.Through comprehensive analysis of multiple parameters,the characteristics of microseismic activity were clarified,and the law of ground pressure activity was revealed.The active period of ground pressure activity in Zhongguan Iron Mine was obtained through comprehensive analysis of multiple indicators.The results show that the designed microseismic monitoring system has calibrated the accuracy of monitoring in its specified area,and the accuracy results in time and space are consistent with the actual situation on site.The monitoring results are effective and reliable.Based on the location and number of microseismic events,multiple parameters such as microseismic activity,cumulative apparent volume,and energy index were analyzed.It was found that the variation patterns and significant feature distributions of each parameter were basically consistent under the same time axis,and the ground pressure activity was more frequent during the monitoring period.Based on the microseismic b value and EV value,the active periods of ground pressure activities in Zhongguan Iron Mine were determined to be from August 28th to 30th,from September 14th to September 17th,and from September 24th to 28th.Observation should be strengthened in order to respond in a timely manner,which provides technical support for monitoring ground pressure activities based on microseismic monitoring technology.