Impact of subway station upper span construction on existing railway tunnel structure

Résumé fourni par la source

In recent years, the rapid development of subway and underground comprehensive pipe corridor has led to frequent encounters with the problem of the close connection between underground structures and existing subway section structures during engineering construction. This paper uses the finite element analysis software ABAQUS to analyze the impact of the construction process of the Sanya Bay Metro Station on the Huofengshan tunnel structure. The aim is to verify and analyze the influence of the construction process of the Sanya Bay Metro Station on the Huofengshan tunnel structure. The calculation results of the two structural models show that the construction of the upper span of the subway station affects the stress field and displacement field of the tunnel surrounding rock, as well as the stress changes in the Huofeng Mountain tunnel lining, which are less than the strength value of the lining concrete. The tunnel surrounding rock and lining structure will experience additional stress and deformation, including changes in the lining&s;s additional tensile stress amplitude and the impact of tunnel vault unloading. Station operation reloading leads to the redistribution of stress in the tunnel surrounding, as well as changes in the tunnel lining structure and track structure morphology, especially for the tunnel operation deepening impact. The construction of the upper span of the subway station affects the structural safety of the existing tunnel, and the safety factor of the secondary lining structure is reduced to a certain extent, providing a reference for similar projects.

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