Study on Protection Scheme of Shield Tunnel in Short Distance Crossing High Speed Bridge Pile
The bridge pile foundation deformation of the shield tunnel running through the expressway is easily caused by the construction disturbance,and the bridge structure is seriously damaged,which affects the use of vehicles.Through the design,numerical simulation,field application,monitoring and analysis of the scheme,the reasonable pre-reinforcement technology is studied,and the shield tunneling parameters are set,so that the bridge pile foundation deformation can meet the design requirements,and the shield construction can cross smoothly and safely.The study shows that ① numerical simulation analysis shows that the isolation pile and grouting reinforcement can effectively reduce the disturbance of shield construction to bridge pile;② the shield parameters in test section is beneficial to control the deformation of surrounding soil body;③ the monitoring results show that the pre-reinforcement scheme and reasonable shield tunneling parameters can effectively control the deformation of bridge pile foundation and meet the requirements of bridge structure deformation control.
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