Through the combination of various geophysical methods and high precision measurements with geological survey results, the structural development of expressway tunnel section is inferred, and a number of faults and joint fracture zones are delineated. A variety of geophysical exploration methods including controlled source audio magnetotelluric (CSAMT) and magnetic exploration are used to explore tunnels in igneous rocks. According to the morphology and electrical distribution characteristics of resistivity anomalies and magnetic prospecting anomalies, several examples are listed and discussed. The stability of overburden in tunnel area is poor, which provides corresponding suggestions for the construction side in expressway construction to ensure the safety of construction.
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