Research on the Influence of Strong Summer Rainfall on the Structural Anti-floating of Underground Subway Stations——A Case Study of Zhengzhou District
In order to explore the structural anti-floating law and technology of subway underground stations under extreme weather conditions such as strong summer rainfall,based on the background of the 7·20 extremely heavy rainstorm disaster in Zhengzhou in 2021,the subway underground stations in Zhengzhou district are taken as an example,and the Henan University of Technology Station,Phase II of Zhengzhou Metro Line 9 is selected as the specific research object.Field investigation,theoretical calculation analysis,finite element simulation and other methods are used to carry out the research.The results indicate that:1)The current anti-floating design based on the current specifications and standards can generally meet practical requirements,but it may not pass the anti-floating calculation in extreme weather conditions such as strong summer rainfall,resulting in safety hazards;therefore,it is recommended to improve the relevant specifications and standards for anti-floating design of subway station structures,and when necessary,appropriately increase the anti-floating safety factor to increase the safety reserve of anti-floating design;2)In the construction process of subway underground stations,it is recommended to fully consider the impact of extreme weather such as heavy rainfall on the groundwater level,and further strengthen structural measures such as anti-floating piles and anchors;when implementing these measures,it's important to consider the technical characteristics and costs of various measures to make reasonable selection or combination;3)The station enclosure structure can provide considerable structural anti-floating for the main structure,making the ultimate bearing capacity and normal use limit state of subway underground stations safer,more scientific,and economical;similarly,other structures such as the connection structure between the interval tunnel and the main structure of the station may also be beneficial for the anti-floating of the station structure,thus,it is recommended to further explore the anti-floating mechanism of these structures and fully utilize them to unleash all anti floating potential.
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