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针对在矿山微地震监测过程中纵横波及其传播速度难以确定的难点,在球坐标系中以波动方程为基础,推导出了矿山微地震全波自动定位的层析成像的计算公式,并给出了参数选择准则,藉此可以获得微地震成像能量最大值及其对应参数。通过判断能量最大值在风险区内的位置,可以将风险区内外的微地震事件区分出来。对于能量最大值位于风险区域内的微地震事件,其震源位置和震动时间以及传播速度与能量最大值对应的坐标参数相同,能量最大值对应于震源函数相对强度;当能量最大值位于风险区域边界上时,微地震事件不在风险区域范围之内。理论模型试算和矿山实际微地震资料的应用表明:层析成像方法无需纵横波识别和传播速度假定,只要给定事故风险区域范围及其传播速度范围,便可完成微地震事件定位,是一种全波全自动定位方法,具有进一步研究价值。
Aiming at the difficulties in determining vertical and horizontal wave propagation velocity in mine microseismic monitoring process and based on the wave equation in spherical coordinate system, the formula of tomographic imaging for full-wave automatic positioning of mine microseismic is deduced and given The parameter selection criterion can be used to obtain the maximum energy of microseismic imaging and its corresponding parameters. By judging the location of the maximum energy in the risk zone, the micro-seismic events inside and outside the risk zone can be distinguished. For the microseismic event with the maximum energy value in the risk area, the coordinate of the source location, the vibration time and the propagation speed corresponding to the maximum energy value are the same, and the maximum energy value corresponds to the relative intensity of the source function. When the maximum energy value is located at the boundary of the risk area At the time, the microseismic event was not within the risk area. The theoretical model test and the application of actual micro-seismic data in mines show that the tomography method does not need the identification of longitudinal and shear waves and the assumption of propagation velocity, and as long as the scope of the accident risk and the propagation velocity range are given, the micro-seismic event location can be completed Full-wave automatic positioning method, with further research value.