Analysis of the Influence of Pipe Jacking Construction on Deformation and Internal Force of Existing Subway Structure
In order to predict the influence of rainwater-sewerage pipelines jacking construction on the existing subway in Tianjin area,a 3D numerical model of stratum-existing structure-pipe jacking construction was estab-lished based on MIDAS GTS/NX platform.In this paper,the mechanical responses of shield tunnel and track in existing subway section during the whole process of pipe jacking construction of new pipeline are simulated and analyzed.The results showed that the construction and excavation of pipe jacking pit and the jacking of rainwater pipeline have obvious influence on the existing structures,while the jacking of sewerage pipeline has weak influence,therefore,this project needs to focus on controlling the excavation of pipe jacking work pit and the jacking construction of large diameter pipeline.The deformations of the existing structure are within the control values range during the whole process of pipe jacking construction.
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