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| Analysis of Settlement Influence on Beijing-Shanghai High-speed Railway Caused by Under-passing of Shijiazhuang-Jinan Passenger Dedicated Line's Bridge |
| SUN Zong-lei，LI Qiao |
| The Third Railway Survey and Design Institute Group Corporation, Tianjin 300142, China |
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Abstract Research purposes: As the foundation of the new building near the existing railway bridge will produce additional stress to the soil，it is inevitable to cause foundation deformation of the existing railway bridge. The Jinan west connecting track bridge of the newly-built Shijiazhuang-Jinan Passenger Dedicated Line needs to under-pass the Yellow River south approach Bridge of the Beijing-Shanghai High-speed Railway. As the ballastless track is used for the Beijing-Shanghai high-speed Railway，it requires strict control of the settlement of the bridge substructure to ensure the safety of train running. Therefore，it is necessary to study the settlement influence on the Beijing-Shanghai High-speed Railway caused by under-passing of the Shijiazhuang-Jinan Passenger Dedicated Line s bridge. The Plaxis 3D finite element program was used to analyze the settlement influences on the bridge of the Beijing-Shanghai High-speed Railway when the solid bridge pier or frame bridge pier of the Shijiazhuang-Jinan Passenger Dedicated Line under-passes for the purpose of determining the minimum impact on the structure and stabilizing the track alignment.
Research conclusions: The analysis results illustrated that on consideration of the additional settlement of foundation caused by the newly building bridge ,the maximum unequal settlement of the adjacent solid pier structure of the existing Beijing-Shanghai High-speed Railway was 3.2mm and the frame pier structure was 4.3mm, and they were in the regulatory range of 5mm and feasible. It was recommended to use the solid pier structure because its additional impact was lesser than the others. In addition, it was proposed that the settlement influence on the existing high-speed railway bridge could be further reduced by extending the length of pile foundation of the new bridge properly and it also pointed out there was a variation between theoretical calculation and real data，so the perfect monitoring scheme，method， control value and early warning value would be established and improved to ensure the safe construction and safe operation of high-speed railway.
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Received: 23 August 2012
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2013, Vol. 30 
