| With the speeding up of urbanization process, high speed railway engineering between cities and urban subway network of cities develop rapidly, the situations of the new subway shield through the high speed railway viaduct bridges happen more and more frequently. In the development of urban rail transit construction, shield tunnel construction method for its advantages of safety, efficient and does not affect the ground transportation got better application and rapid development. However, shield tunnel crossing engineering will cause deformation of strata, structure of viaduct and track structure. So there is a big security risk.This paper is based on a new subway shield interval through the beijing-tianjin inter-city railway. By using finite element analysis software ANSYS numerically simulate shield tunnel construction process and analyzes the actual data, shield crossing inter-city railway elevated line deformation caused by the influence and risk control are studied. The main work and results were as follows:(1) Formation caused by shield tunnel crossing construction and elevated line deformation mechanism is studied theoretically.(2) By using ANSYS finite element software,3D entity formation-structure model is established. By simulating shield construction, the deformation data predicted by the model are analyzed. The effects of track structure and the beijing-tianjin inter-city elevated bridge structure caused by shield construction are mastered.(3) By sorting and analyzing monitoring data of actual engineering, the actual settlement deformation law of inter-city railway viaduct and track in the process of shield crossing are got. The result of theoretical simulation is compared and analyzed with the actual monitoring results, validating the correctness of the model.(4) By analyzing and summarying effective control measures of shield through the inter-city railway viaduct, reasonable suggestions are provided for the similar shield crossing engineering. |
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