Research on Excavation Influence of Deep Foundation Excavation on the Stress Characteristics of Adjacent Elevated Bridge
Based on the deep foundation excavation project of a subway station,numerical simulation analysis is conducted to analyze the deformation and stress of the foundation excavation enclosure structure,elevated bridge piers,and pile foundations,in order to study the excavation influence of deep foundation excavation on the stress characteristics of adjacent elevated bridges.The research results show that as the excavation depth increases from the initial state to the bottom,the horizontal displacement of the foundation excavation enclosure structure gradually increases,while the bending moment changes more complex.The tunnel penetration at the station entrance and exit has no significant effect on the horizontal displacement and bending moment of the enclosure structure.The excavation of the foundation excavation has a significant impact on the y direction horizontal displacement of the elevated bridge piers.As the excavation depth increases,the vertical deformation of the elevated bridge piers shows a trend of first uplift and then settlement.When the tunnel at the entrance and exit of the station is connected,compared with the settlement value from the excavation of the foundation excavation to the bottom,the piers show a slightly upward uplift trend.Moreover,under different excavation conditions,the maximum differential settlement between adjacent piers meets the regulatory requirements,and the bridge piers are in a stable state.When the foundation excavation is excavated from the initial state to the bottom,as the excavation depth increases,the y direction horizontal displacement and bending moment of the pile foundation near the elevated bridge gradually increase.During the excavation process of the foundation excavation,it is recommended to increase the thickness or stiffness of the enclosure structure in areas that have a significant impact on the pile foundation of the elevated bridge,in order to reduce the impact of excavation on the pile foundation.
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