This paper adopts a new magnetotelluric method:multi-polarization magnetotelluric method for tunnel survey under complex terrain conditions.The adoption of the space common point multi-polariza-tion same-frequency observation method effectively suppresses the static effects,improves the efficiency of magnetotelluric exploration in mountainous areas,and improves the accuracy of detecting faults.In the application of the Xinshan tunnel on the Xichang to Shangri-La expressway,this method accurately and quickly reflected the location of multiple fracture structures and geological characteristics of the tunnel,which plays a good guiding role in subsequent tunnel design and geological investigation work.The results show that the multi-polarization magnetotelluric method can play an ideal effect in the fault identification under complex terrain conditions.
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