Based on the deep foundation pit project of the TOD(transit-oriented development)complex of Shaoxing north high speed railway station,the influence of different construction stages on the deformation and inclination rate of the adjacent viaduct and its variation law are studied through field measurement and numerical simulation;The construction process is optimized by the method of reinforcement outside the pit,and the influence of distance on viaduct is summarized.The results show that with the excavation of foundation pit,the deformation of viaduct pier and bridge pile foundation gradually increases,and the deformation of bridge pier is larger than that of bridge pile foundation;As the depth of soil reinforcement outside the pit increases,the vertical displacement of the bridge pier top and bridge pile foundation gradually decreases.The deeper the reinforcement depth,the better the displacement control effect of the elevated bridge.When the reinforcement depth is 30 m,the displacement decreases by 50%,effectively protecting the safety of the adjacent elevated bridge.In practical construction,it is recommended to take the reinforcement depth as the optimal excavation depth of the foundation pit;The deformation of piers and bridge piles generally shows a decreasing trend with the increase of the distance between the viaduct and the foundation pit.When the viaduct is close to the foundation pit,it will be affected by the pit angle effect,and the fluctuation will decrease.The conclusions drawn in the article can provide a basis and reference for design and construction,and provide reference for similar projects.
foundation pit engineeringdeformation of bridge pier and bridge pile foundationnumerical simulationdeformation rule
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