Study on the Impact of Deep Foundation Excavation on Existing High-Speed Railway Bridges
The impact of adjacent railway foundation excavation on railway bridge piers is currently a key and difficult problem in railway-related engineering construction.Taking the Jianghai Research and Administrative Business Center Project in Nantong City as a background,this study applies a numerical analysis software and adopts a strain-hardening constitutive model with considering the pile-soil interaction to analyze the impact of foundation excavation on nearby high-speed railway bridge piers.The rationality of the calculated results is further verified based on field-measured data.The research findings indicate that the strain-hardening constitutive model of soil can realistically simulate the deformation impact of deep excavation on nearby structures.The construction of excavation protection structures has a relatively minor effect on high-speed railway bridge pier deformation,while dewatering and excavation of foundation pit have a significant impact on pier deformation.The result of finite element calculation in this project is quite consistent with the field test result and far below the specified limit,which can meet the safety operation requirements of high-speed railway bridges.
foundation excavationhigh-speed railway bridgefinite element analysisfield monitoringoperation safety
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