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Safety Analysis on the Bridge Traversed by Metro Double-Line Tunnels

LU Gaofeng,WEI Qingchao(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)  
Construction of metro tunnel traversing the existing urban bridge foundation is an ordinary form.Bridge safety menaced by traversing construction of metro section tunnel is highly concerned.Beisihuan Road of Beijing was traversed by the section tunnel with double lines between Olympic Sports Center Station and Olympic Park Station under Beichen Bridge along the north-south direction.Beichen Bridge is composed of three flyover bridges.For enhancing the global integrity and improving the deformation resisting capacity of the bridges,the foundation under bridge piers was specially designed and disposed as an integral reinforced concrete U-shape groove foundation considering the influence of the traversing construction of the section tunnel.During the construction of the section tunnel,disturbance on Beichen Bridge is inevitable,which resulted in the additional settlement between the U-shape groove foundation and bridge piers.In this paper,based on the three dimensional model set up in FLAC 3D,the traversing construction of section tunnel through Beichen Bridge in Beijing was taken as a example,and the settlement and deformation caused by the traversing construction of double-line tunnels of the existing bridge structures were calculated and analyzed in detail for the whole construction procedures.Subsequently,the inner forces of cap beams of No.2 Bridge were checked.The calculating results show that the deformation indices and the inner forces of the bridge components were lower than the corresponding allowable limit value.The availability of the construction method was validated by the monitoring data recorded in-situ.
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