Model simulation test for large-scale water inflow in Feixianguan Tunnel in Red Bed Area

Water inrush from large tunnels often occurs in Karst areas,which are rare in red layers where water is traditionally considered to be poor.As one of the key control projects of Yakang Expressway,Feixianguan Tunnel has a huge water inrush when it reaches the K23+708 tender section. The water inrush volume is up to 1.74×106 mL/s. After a periodic water inrush,the steady flow is about 3.48×105 mL/s.Taking the Feixianguan tunnel as an example,this paper combines the previous results of hydrochemical analysis of water gushing in the tunnel,using the self developed percolation test slot device,which was specially used to simulate the process of tunnel water gushing,the prototype of K23+658~883 segment (225 m) of Feixianguan tunnel to a certain proportion as a model,and two typical sections of Feixianguan syncline were selected for physical simulation test.Through the fitting analysis of the test water inflow and the comparison of the characteristics of the measured water gushing in the tunnel,two kinds of water inrush modes of along the axis and around the axis were verified,and the source and channel of the water gushing were determined.The experimental results showed that the model was stable and reliable,and the research method and results may use as guidance and reference for the future research of similar projects.

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