面向不同时空的煤矿工作面底板微震突水预警方法

Microseismic Early Warning Method of Water Inrush in Coal Mine Floor Facing Different Time and Space

针对煤矿工作面底板突水灾害的预警难题,提出了1种基于微震监测的不同时空预警方法,解决了传统预警无法全面覆盖工作面不同时空的问题。基于1108工作面的钻孔及微震数据,采用2D-CE(Two-Dimensional Cumulative Energy,二维累积能量)法与核密度分析提升矿井预警精度。结果表明,在超前采动时期,超前支承应力影响低阻区,微震频率高但能量小,微震椭圆倾斜角度增至8.5°,且已穿透L8含水层,但与L2含水层保持距离。该预警方法提高了突水预测的精度,可为类似矿区的水害防治提供借鉴。

In order to solve the problem of early warning of water inrush disaster in coal mine floor,a warning method for different time and space based on microseismic monitoring was proposed,which solved the problem that traditional early warning could not fully cover different spatiotemporal working face.Based on the borehole and microseismic data of 1108 working face,2D-CE(Two-Dimensional Cumulative Energy)method and nuclear density analysis were used to improve the mine warning accuracy.The results showed that in the advanced mining period,the advanced bearing stress affected the low resistance zone,the microseismic frequency was high but the energy was small,the inclination angle of the microseismic ellipse increased to 8.5°,and the microseismic ellipse had penetrated the L8 aquifer,but has kept a distance from the L2 aquifer.The method improved the accuracy of water inrush prediction,and can provide reference for water damage prevention in similar mining areas.