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本文在现有隧道超前地质预报方法的基础上,引进了一种新的隧道超前地质预报的方法—瞬变电磁法。该法对低阻含水断层、充泥充水溶洞、含水含泥破碎带等水体不良地质体反映灵敏。通过对瞬变电磁法在隧道探测中关键技术的研究,解决了隧道背景影响和装置自身过渡过程影响等关键技术问题,成功地将瞬变电磁法用于隧道超前地质预报。通过对实例验证结果表明,应用瞬变电磁法进行隧道水体不良地质体超前地质预报是有效的。
Based on the existing methods of advanced geological prediction of tunnels, this paper introduces a new method of advanced geological prediction of tunnels - transient electromagnetic method. The method is sensitive to the poor resistivity of water body such as low-resistivity water cut, filled water-filled caverns, and water-bearing mud-broken zone. Through the study of the key technologies of transient electromagnetic method in tunnel detection, the key technical problems such as the influence of tunnel background and the transition process of the device itself are solved, and the transient electromagnetic method is successfully applied to the advanced geological prediction of tunnels. The experimental results show that it is effective to apply transient electromagnetic method to predict the geological advancement of adverse water bodies in tunnels.