基于井上下微震联合监测技术的震源高度误差控制研究

Improvement of the error of hypocenter height based on surface-underground microseismic monitoring technology

针对近水平煤层因所有微震监测台站均位于同一个水平面内,导致震源高度定位误差较大,无法满足现场监测要求,从震源求解偏微分导数的角度,理论分析了水平煤层震源高度求解误差较大的机理,提出了井上下微震联合监测技术,同时研究了地面台站的层状波速模型,利用爆破事件反演得出最佳P波波速。并通过分析门克庆煤矿和大海则煤矿的井上下微震联合监测数据,证明了该项技术对震源高度求解误差具有较好的改进作用。

As all the microseismic monitoring stations are located in the same horizontal plane for the near horizontal coal seam, the hypocenter height error is large, which can not meet the requirements of the monitoring. From the perspective of source solving partial differential derivatives, the mechanism of large error in hypocenter height of horizontal coal seam is analyzed theoretically, and then the concept and implementation method of microseismic joint monitoring technology of the surface-underground are proposed aiming at the above problems. The layered wave velocity model of ground station is studied, and the best P-wave velocity is obtained by the inversion of the blasting event. Finally, by analyzing microseismic joint monitoring data of Menkeqing Coal Mine and Dahaize Coal Mine, it is proved that the surface-underground microseismic joint monitoring technology has a good improvement effect on the error of the hypocenter height.