Research on Early Warning and Risk Control Technology in Karst Tunnel Construction

In the construction of mountain tunnel in karst area, there are some disasters, such as collapse, gushing water and so on. In order to avoid casualties and heavy economical losses caused by disaster accidents, construction risk must be warned early and controlled. Common methods used in risk warning and control are introduced with their principles analyzed. Illustrated by the case of Hurongxi Longtan tunnel, TSP 203 system is used to perform the advanced detection in the tunnel before excavation. Water-bearing condition is detected by using infrared water detection apparatus and the peripheral displacement of the tunnel is monitored real-timely in excavation process. Combining the several methods, collapse of the tunnel is predicted successfully. The result indicates that the technology is worth popularizing in similar engineering.