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利用以可控源音频大地电磁法为主,甚低频法、部分地段激发极化法和瞬变电磁法为辅助手段对南水北调西线一期工程中20 km深埋长隧洞段进行了探测研究,主要介绍可控源音频大地电磁法法隧洞勘探的效果及其他几种辅助方法的作用。综合利用物探资料及地面工程地质勘察结果对深埋长隧洞围岩介质的结构特征进行解释,并评价可能影响工程的断层、破碎带及异常区,这将对工程施工提供非常有用的帮助信息。
In this paper, the deep and long tunnel section of 20 km in the first stage of the South-to-North Water Diversion West-Route Project is investigated by means of controllable source-audio-ground magnetotelluric method, very low frequency method, excitation excitation polarization method and transient electromagnetic method in some sections. This paper mainly introduces the effect of controlled-source audio-frequency MTT tunnel exploration and several other auxiliary methods. Comprehensive utilization of geophysical prospecting data and ground engineering geological survey results explain the structural characteristics of surrounding rock mass in deep and long tunnels, and evaluate the faults, broken belts and anomalous areas that may affect the project, which will provide very useful help information for construction.