Abstract:

Counterslope drainage is very important in the construction of the long inclined shafts and main tunnel of Guanjiao tunnel. The counterslope drainage of Guanjiao tunnel has such characteristics as long distance, high lift and large water flow rate. In this paper, the hydrological characteristics of Guanjiao tunnel is presented, and the pump station arrangement, the pump allocation, the pipe line arrangement and the power supply system for the counterslope drainage of the inclined shafts of Guanjiao tunnel are studied. The measures taken, including pump allocation, doubletunnel pump stations and power supply system, are summarized. In the end, the flooding of the inclined shafts has been avoided due to the application of the counterslope drainage technologies. The paper can provide reference for similar projects in the future.

Key words: Guanjiao tunnel, long inclined shaft, long distance, counterslope drainage