Abstract
AbstractIn this study, using the background of Qiyueshan high-risk karst tunnels, flow characteristics and escape-route optimization after water inrush in a backward-excavated karst tunnel are researched. First, five case studies are simulated and investigated under different velocities of water inrush. One special probing line is selected, respectively, in the left tunnel, cross passage, right tunnel, and along the height direction of the tunnel centerline. For each probing line, the corresponding velocity and pressure curves are obtained based on the numerical simulation results. The change rules of velocity and pressure under the five water-inrush velocities are analyzed and concluded. Then, focusing on one velocity of water inrush, the variation laws of velocity and pressure in a plane are analyzed and discussed by selecting a series of probing lines. Flow characteristics of water after inrushing in a backward-excavated tunnel are summarized. Finally, for such cases, the optimized escape routes are ma...
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