Application of Integrated Geophysical Methods in Tunnel Exploration

摘要

To reduce the multiplicity and uncertainty of solutions from single geophysical exploration, the integrated geophysical methods are proposed to detect and check geophysical anomalies mutually and then deduce wall rock fracture and Karst cave developing zone. In this paper, basic theories, applicability and field working methods of combined shallow seismic refraction and Controlled source audio-frequency magnetotellurics (CSAMT), multi-electrode resistivity imaging as well as ultrasonic logging are introduced to deal with a part of tunnel zone of China-Burma gas pipeline to demarcate weathered zone, yield corresponding elastic parameters of rock, and figured out faults and Karst caves that surrounded the cave line. The results showed that the integrated geophysical methods should be promoted intunnel exploration.