APPLICATION OF THE HIGH FREQUENCY MAGNETOTELLURIC SOUNDING IN THE EXPLOATORY INVESTIGATION OF RAILWAY TUNNEL ENGINEERING

Karst caverns and faults around the railroad present a great threat to the safety of railroad tunnel construction. In this paper, the authors explored applicability of the high frequency MT method by using the stratagem~(TM) EH-4 electrical conductivity image-forming system for advance detection of the karst caverns and faults within a specified depth. At the end of the paper a case study is presented to demonstrate its application.