Analysis of the Impact of Karst Tunnels on Groundwater Environment and Prediction of Water Inflow
During the construction process of tunnels,especially in karst areas,many tunnels have encountered groundwater disasters.So it is necessary to study the behavior of karst groundwater systems under tunnel engineering interference.Taking the proposed Lujiao Tunnel in the main urban area of Chongqing as an example,this paper analyzes the hydrogeological conditions in the tunnel site area and establishes a groundwater seepage model in the tunnel site area.On this basis,the study simulates the impact of tunnel engineering on the groundwater environment.And the groundwater runoff modulus method and numerical simulation method are used to predict the maximum water inflow of the tunnel.The results show that during the tunnel construction period,the range of groundwater impact increases with time,reaching its maximum after two years of excavation.The groundwater level tends to stabilize after ten years of tunnel operation,but it is difficult to restore to its natural state;the lower the tunnel elevation,the greater the hydraulic conductivity coefficient of the tunnel,and the greater the impact on the groundwater environment.Then the risk section of water inrush has been clarified,providing theoretical and technical support for tunnel construction safety and design decision-making,and providing reliable criteria for environmental management during the operation period.
tunnelnumerical simulationgroundwaterprediction of water inflow
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