Analysis on the process of water burst catastrophe and it's prevention countermeasures in a karst tunnel

On basis of the investigation on engineering geological conditions, the process, pattern and features of karst water burst, as well as the mechanism of the water burst, were studied by means of laboratory test, numerical modeling, theoretical analysis and in-situ tests. The results showed that the karst water burst in a tunnel was a gradually developed process, which is influenced by water pressure, filling materials and plastic zpnes around the tunnel. Detailed technical measures were planned for different karst structural types and different geological modes in Yuanliangshan tunnel.