Development of tunnel detection technology using the transient electromagnetic method in China

Recently, with the increasing complexity of the topography, geological conditions and working environment in tunnel engineering, rapid and fine detection is significance to the safe construction in tunnel. Transient electromagnetic (TEM) method has advantages in detection of sudden water and mud bursts in tunnels for its characteristic of sensitivity to low resistance anomalous. Focused on tunnel detection, multi-scene and multi-scale detection system of air-ground-underground transient electromagnetic method is analyzed. The research shows that the semi-airborne TEM is efficiently and well-adapted in complex area in the detection depth of 500 m, and the ground TEM has the advantage of large detection depth (2000 m). Moreover, transient electromagnetic advance prediction method has advantages in distinguishing the close adverse geological bodies (100 m) in drilling and Tunnel Boring Machine (TBM) tunnel. Synthesize the advantages of these methods, explore to combine the advanced prediction with the preliminary geological survey to realize the integration of air and sky for efficient exploration.