非均匀介质条件下矿震震波三维传播模型构建及其应用

Three-dimensional propagation model building in heterogeneous medium of mine earthquake shock wave and its application

为了研究速度模型对矿震定位误差的影响,基于惠更斯原理建立了矿震波在层状非均匀介质中的三维传播模型,通过现场爆破振动试验,采用矿山微震定位监测系统进行监测。对矿震震波的正演建立了矿震震波传播的三维波动方程,并给出了矿震波在介质分界面上传播速度计算公式,由此对经典线性定位方法进行合理改进,使得基于均匀介质的线性定位方法适合于非均匀分层介质。将理论推导结果应用于矿山微震监测定位系统中,进行实际矿震定位计算。试验表明,速度模型对定位的影响较大,运用所建立的三维传播模型应用于矿震定位,有效提高了定位精度。

In order to study the influence of velocity model on the deviation of shock bump earthquake location, three dimensional propagation model of mine quake waves in the layered inhomogeneous media was built based on Huygens principle. Through blasting vibration tests, monitoring was made by microseismic system of mine. The three-dimensional wave equation was built for seismic waves forward, and propagation velocity＇ s calculation formula on the dielectric interface was also given, on which the classical linear positioning method was reasonably improved so that the linear positioning method based on uniform medium suits for inhomogeneous medium. The actual calculation for shock bump can be made through the application of deduction results to mine microseismic monitoring and positioning system. The results show that velocity model greatly affects positioning. By using 3D propagation model in the shock bump positio- ning, location accuracy is effectively improve.