Study on Deformation Control of Shield Tunnel Undercrossing Railway Bridge at Close Distance
Shield tunnel construction undercrossing the existing bridge foundation is bound to cause the settlement and displacement of the existing bridge foundation.Based on the example of shield tunnel undercrossing the bridge foundation engineering of railway line for many times,this paper analyzes the bridge deformation,risk identification and control standard in the process of shield crossing,and mainly adopts four measures to reduce the construction impact and reduce the construction risk,such as optimizing the linear design of shield tunnel,improving the self-control of shield,implementing the ground control measures and implementing the post-construction control measures.On this basis,the quality control measures of shield tunnel under railway are put forward.The results show that the maximum settlement value of the bridge pile foundation during the construction process is 1.263 mm,and the maximum displacement value is 0.198 mm.The settlement and displacement monitoring results meet the limit requirements,which ensures the operation safety of the existing railway line during the shield construction process.
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