Research on Reinforcement Measures of Karst Tunnel with High Pressure Water Based on Fuid-soild Coupling
The southwestern region of China is mountainous and rich in groundwater.The hydrogeological conditions faced by highway tunnels during construction are complex and varied.Numerous engineering practices at home and abroad have shown that when tunnels pass through high pressure karst geology,they are prone to engineering disasters such as mud bursts,water inrush,and even collapse due to loose surrounding rock,poor self stabilization ability,abundant pore water,and full pore water pressure.For the purpose,research on reinforcement measures for high pressure water karst tunnels based on fluid structure coupling was carried out.In this paper,Wuxi Tunnel was used as a supporting project.Through numerical simulation of tunnel construction using different reinforcement measures,including curtain grouting,advanced small conduits,and radial system anchor rods,the effects of different reinforcement measures were compared and analyzed.The results show that:1)High pressure karst tunnels are prone to overall instability and damage,when only initial support is applied to the tunnel;2)After adopting curtain grouting reinforcement measures,the deformation and plastic zone of the surrounding rock are effectively controlled;3)The use of curtain grouting,advanced small conduits,and radial system anchor rods to control the deformation of surrounding rock has a more significant effect,which can further provide safety reserves for the tunnel;4)Based on the reinforcement effect and economic cost control,the recommended solution is curtain grouting+radial system anchor rod.
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