有源无源大地电磁在玄武岩覆盖区长大隧道发挥的作用

Influence of MT With Source and without Source in Long and Big Tunnels with Basalt Buried

滨绥线牡绥段长大隧道大部分被玄武岩覆盖着,地质调绘、常规物探方法难以发挥作用,采用有源和无源大地电磁法取得了较好的地质效果,本文在研究玄武岩物性特征和大地电磁方法特点的基础上,对牡绥线有源、无源大地电磁实例效果进行分析。

Most of big and long tunnels in mu-sui portion of bin-sui railway are buried by basalt,so it is difficult for geological mapping and general geophysical method to resolve it. Adopting MT with source and without source could obtain preferable geological effect,based on physical character of basalt and character of MT,the effects of MT with source and without source in mu-sui railway are analyzed.