Deformation Monitoring Of Railway Bridges Group Influenced By Construction Of Metro Tunnel

Accompany with the constrution and operation of Wuhan-Guangzhou high-speed railway. Zhengzhou-Xi’an high-speed railway and Beijing-Shanghai high-speed railway, China has established a nationwide High-speed railway network.According to its current transportation planning and design concept of "no transfer", it is proposed to build more connected subway lines under the high-speed railway stations in urban areas.This kind of mordern transportation hub can realize rapid evacuation of the passenger flow.Due to various reasons, the construction of urban subway lines often lag behind that of the high-speed railway, and cannot put into operation simultaneously, which inevitably leads to the station near the subway construction will pass through the opened high-speed rail lines.In order to achive the optimal land utilization.Bridge-Instead-of-Embankment Design Concept is widely used near the cities.The process of subway construction can produce disturbance to surrounding soil,leading to plain displacement deformation.incline displacement deformation, and settlement deformation.Meanwhile.the ballastless tracks are high demand for the stability of foundation.So deformation monitoring of high-speed railway bridge caused by subway construction has notable engineering significance.Based on actual conditions on Nanjing Subway Line6which pass through high-speed railway bridges, we adopt measuring method of combining the surveying robot,tilt sensor and hydrostatic leveling system.which monitored plain displacement,incline and settlement of bridges.Afterwards.we dispose the datum of incline and settlement with real-time monitoring,by Kalman Filte Method.Comparing the regularity of bridge deformation the results can be shown that they have a consistent variation tendency with little difference.According to the comprehensive analysis of monitoring datum.it is assured that the deformation regularity of isolation protection pile near the fifth Ningan intercity Bridge the effectiveness of isolation protection pile.It also assured the deformation regularity of bridge foundation near the Beijing-Shanghai high-speed railway,with different period of Shield tunnel construction.Eventually.we analyzes the link betweenthe different stages of deformation and the corresponding working conditions.Monitoring results indicate the effectiveness of the monitoring system and reflect the plain displacement, incline and settlement of high speed railway bridge piers in various construction conditions.It also provide objective datum for the security of high speed railway’s operation and subway’s construction.Research conclusions offer certain reference value for other similar projects.