Research On Mutual Influence Between Construction Of Viaduct Pile Foundation And Its Adjacent To Metro Stations Under Construction

With the development of urban transportation network lines,cross-cutting,parallelism,and overlap of ground constructions and underground structures at the same location are increasing.How to ensure the safety and stability of the two during the construction period and the operation period is currently the hot spot of research,and it is also a technical problem that engineers and technicians want to overcome.This paper discusses the construction of viaducts in the reconstruction of the Hongdu Avenue Expressway in Nanchang and the parallel construction of the nearby metro stations under construction.Based on numerical simulation,site monitoring,and risk assessment methods,the impact of the construction of viaducts on the adjacent metro stations under construction is discussed.Conduct research analysis.The main work of the thesis is as follows:(1)According to the actual project,the finite element model of the real relative position is established to study the influence of viaduct construction on the subway station under different working conditions(under different construction phases of the sub way station under construction),analyze the deformation of the station structure,deformation of the envelope structure,and The comparison of on-site monitoring data valid ates the accuracy of numerical calculations.It is concluded that during the construction of the station under construction,the impact of the construction of the nearby viaduct on the station under construction varies,but the overall trend is similar.When the soil in the lower part of the station under construction is excavated to the bottom,the impact of the viaduct construction on the station is far greater than the construction of the viaduct after the completion of the main structure of the station.(2)According to the actual project,a finite element model was established to study the influence of the excavation process at the station under construction on the adjacent existing elevated bridge piles.It was concluded that the underground continuous wall was offset toward the interior of the foundation pit,and the maximum horizontal displacement was generally located in the middle of the pit depth.Two-thirds of the pit excavation depth range.During excavation of foundation pit,the soil layer at the bottom of the foundation pit shows the phenomenon of "two small and medium big" uplift;the pier of the viaduct will produce horizontal displacement,and the closer to the edge of the foundation pit,the greater the horizontal displacement of the pile foundation;(3)Considering the safety of construction,put forward the main structure of sub way station cap after impact of the pit excavation pile in horizontal direction and suggestions of Foundation Pit Adjacent Viaduct Construction can not be ignored,after the project should also increase the measurement shift,as index of side pile internal force.