矿井大电流瞬变电磁技术在黔北矿区的应用

Application of Large Current Transient Electromagnetic Technique in North Guizhou Mining Area

针对黔北矿区主采的二叠系龙潭组煤层受上覆长兴灰岩含水层及下伏茅口灰岩含水层的双重威胁,以及老硐积水产生的突水威胁的复杂水文地质特点,根据矿井直流电法、高密度电法等物探技术在水文地质探测中的效果及存在的问题,研究了一套矿井大电流小线圈瞬变电磁勘探技术与装备,弥补了传统物探方法的不足,最大程度地抑制了井下干扰,增强了信噪比,显著提高了探测目标体的深度与精度,对矿井水害进行更准确的科学预测预报。

In view of the Permian coal seam of Longtan formation, the main coal mine in northern Guizhou mining area is threatened by overlying Changxing limestone aquifer and lower Maokou limestone aquifer, and complex hydrogeological features of the threat of water inrush from goaf water, according to the effect and existing problems of mine direct current method and high-density resistivity method in hydrogeological exploration, a set of transient electromagnetic prospecting technology and equipment for large current and small coils in mine were studied.Which made up for the shortcomings of traditional geophysical methods, restrained interferences under the shaft to the greatest extent, enhanced the signal-to-noise ratio, greatly improved the depth and accuracy of target detection,and predicted the mine water disaster more scientifically.