Abstract：Research purposes: By making treatment of underground river at Wuzhaoguan, a set of economic，safe and feasible construction methods of tunnel excavated below through underground river were summarized so as to guarantee the safety of construction and operation，which provided experience for similar construction.
Research methods ： The engineering comparison and site experience were made.
Research results: Wuzhaoguan Tunnel were passed below through underground river successfully, by adopting the scheme of grouting interception and ponding to make undercurrent flow above the tunnel and by deep-hole grouting to strengthen the accumulation body. A serious of engineering measures were used, such as grouting at moving water state in the accumulation body, small pipe-proof protection，powerful support, short bench cut method, tunnel foundation root by steel-pipe pile grouting, etc.
Research conclusions：According to underground river engineering geological and hydrogeological conditions，this paper adopted the key technologies of”partition and sequence, mufti-joint pump，more slurry mix, rapid solidification and early strength"，effectively resolve the problems of the grouting closure and raising groundwater levels and tunnel excavation beneath the underground river accumulation in the rock-open-boundary conditions and high water flows rich state.
2007, Vol. 24 
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