强干扰环境下铁矿导水通道精细探测研究

为实现北洺河铁矿不明涌水异常区域导水通道的精确定位,保证该矿安全生产,采用矿井瞬变电磁法对该铁矿-110 m水平11#穿脉顶板岩层进行了探测。在对金属干扰下的矿井瞬变电磁响应特征进行理论分析的基础上,结合该铁矿实际地质情况分析其地球物理特征,采用系数校正法对实测数据进行金属干扰校正,再将其作为初始模型进行全空间瞬变电磁蜂群算法反演处理,最终得到了工作面顶板高分辨率电阻率成像结果,结合已有地质资料,实现了富水异常区以及导水通道的精细探测;探测结果得到了钻孔验证。研究表明,采用有效的数据处理手段,矿井瞬变电磁法可以提高铁矿工作面顶板岩层的富水异常位置的探测精度,为铁矿防治水工作提供有效的技术保障。

Fine detection of water-conducting channels in iron mine under strong interferences

To achieve the accurate positioning of the water-conducting channels in the areas with unknown anomalous water inrush in the Beiminghe iron mine to ensure the safe production of the mine, this study explored the 11# across-vein roof at -110 m level in this iron mine using the mine transient electromagnetic method (MTEM). Firstly, this study briefly introduced the basic principle of MTEM and theoretically analyzed the characteristics of mine transient electromagnetic response under metal interferences. Then, it analyzed the geophysical characteristics based on the geology of the iron mine and corrected the measured data targeting metal interferences using the coefficient correction method. Afterward, the measured data were used as the initial model for the inversion of full-space transient electromagnetic using the bee colony algorithm, obtaining the high-resolution resistivity images of the working face roof. The images combined with the existing geological data allow for the fine detection of water-rich anomalous areas and water-conducting channels, and the detection results were verified by drilling. The results show that the MTEM can effectively improve the detection accuracy of water-rich anomalous positions in the roof strata of the working face in iron mines by means of effective data processing, thus providing effective technical support for water control in iron mines.