The karst water is one of the main geological disasters in tunnel construction in Karst area. The disaster of water inrush in karst tunnel is studied in this paper. FLOW-3D is used to simulation movement patterns of water inrush in karst tunnel based on BaoFeng tunnel engineering. The following contents are studied. Firstly, the total duration in tunnel and the characteristics of tunnel water inrush were studied. Secondly, 140s time before the water inrush from the left tunnel discharge, the main reason for the lowest surface for the cross channel is slightly higher than that in the bottom of tunnel. But 140s after the water inrush from the left tunnel discharge, the drainage discharge by the right line, the main reason for the decrease in left line tunnel velocity, kinetic energy due to the force of gravity, resulted in the initial stage of the water began to flow of the tunnel face and the formation of turbulence. Thirdly, at the beginning stage, water gushing speed was up to 17m/s, and the waves move forward. Fourthly, the viscosity and density of water inrush has little influence on the rate of water inrush. The research will provide the basis for karst tunnel water inrush prevention theory.
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