Abstract:

The ground surface hydrology of Yuanliangshan deepburied extralong tunnel is monitored and analyzed, so as to obtain the degree and range of the influence on the ground surface hydrology imposed by water burst occurring during the construction of karst tunnels. Conclusions drawn are as follows: 1) The degree and range of the influence of water bursts on the ground surface hydrology can be evaluated by means of monitoring the flow volume of hanging springs and the water levels of ground surface well springs. 2) The hydraulic conductivity between the tunnel and the ground surface can be deduced from monitoring of and comparison and contrast between ground surface rainfalls and water bursts. 3) The tunnel construction has some influence on the springs above the tunnel, but has little influence on the vegetations. 4) It is necessary to monitor the ground surface hydrology, which can provide reference for the construction of karst tunnels. 

Key words: Yuanliangshan tunnel, karst, water burst, hanging spring, well spring, rainfall, ground surface hydrology monitoring