本文介绍了大地电磁测深的基本原理、工作方法和资料分析，并结合地质、钻探等手段，成功解释出了吉口隧道岩性分布和地下水及断层破碎带的位置，经验证物探成果与实际地质情况吻合较好，说明该方法是隧道勘察中一种行之有效的手段。%This paper mainly introduces the basic theory, operating method and data processing of the magnetotelluric sounding. This method successfully make clear the lithology distribution and fault fracture of Ji Kou Tunnel. Moreover, the geophysical exploration results are consistent with actual geological condition.
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