The surrounding rock mass in the outlet area of the flood discharge and sand discharge tunnel of the Hunyuan Pumped Storage Power Station is thin,with developed faults,making tunnel construction difficult and high-risk.This paper combines the principles of engineering geological analysis with finite element numerical simulation to conduct research and analysis.The surrounding rock is classified as Class IV,with relatively fractured rock mass and unstable rock mass.The engineering geological conditions at different entry points are the same,and the plastic changes,displacement,and stress changes in the tunnel surrounding rock caused by slope and tunnel excavation are basically the same.Simply changing the position of the entry point in the construction plan cannot reduce the difficulty of tunnel construction,nor can it avoid the construction risks of the tunnel.This study points out the direction for determining the outlet scheme of flood discharge and sand discharge tunnels.
关键词
泄洪排沙洞/围岩/数值模拟/进洞点/工程地质问题
Key words
flood discharge and sand discharge tunnel/surrounding rock/numerical simulation/entry point/engineering geological problem
维普
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