Analysis of the Influence of the New Ramp Bridge on the Deformation of the Adjacent Underground Structure
With the continuous improvement of traffic network construction and the increasingly widespread distribution of rail transit systems in cities,it is inevitable that new bridges will intersect or be adjacent to existing underground section tunnels,and their construction will have an impact on adjacent tunnel structures.Taking a newly built ramp bridge as an example,this paper uses Madis software to analyze the impact of each stage on adjacent section tunnels from the entire process of pile foundation hole formation,pile cap excavation,and upper load application,and deeply analyzes the impact relationship between bridge pile foundation and section tunnel horizontal clear distance.The research shows that during the entire stage,the impact of pile foundation hole formation stage is the greatest,and the horizontal clear distance between pile foundation and existing tunnel is closely related to the impact degree.Tunnel deformation decreases as the horizontal distance between the tunnel and the pile foundation increases.When the pile foundation is relatively close to the tunnel,it is more obvious to reduce tunnel deformation by increasing the distance between the pile foundation and the tunnel.A more intuitive understanding of the impact of bridge pile construction on the deformation of adjacent section tunnels has been obtained,providing some reference for similar projects.
hole forming of pile foundationhorizontal clear distancewhole process
NETL
NSTL
万方数据
