Research on the Influence of Deep Foundation Pit Engineering on the Structure of Existing Subways
[Purposes]This paper aims to study how to effectively control the influence of deep foundation pit construction on the existing subway structure,and on this basis,the correlation analysis of the struc-tural clear distance,excavation depth and precipitation on the formation of structural deformation is stud-ied.[Methods]This paper takes the influence of the subway station under construction on the existing subway line in a city as an example,the influence law of deep and large foundation pit construction on the existing subway line is studied by using the technology of station main end reinforcement,retaining struc-ture diaphragm wall reinforcement and the monitoring construction of existing line structure.[Findings]The research shows that:①It is necessary to strengthen the adjacent side of subway tunnel before the exca-vation;②When the net distance between the foundation pit under construction and the existing subway line is greater than 18 m,the influence of construction on the existing subway line can be controlled within the limit range;③When the excavation surface is lower than the elevation of the tunnel bottom,the protection of the subway line will be weakened by measures such as seismic isolation pile reinforcement,and at the same time,the deformation rate of the tunnel will increase exponentially under the influence of precipita-tion,excavation speed and other factors.[Conclusions]The results show that the construction of deep foun-dation pit near the subway has influence on the existing subway lines,the influence is related to the distance and excavation depth to some extent,and proactive preventive measures should be taken before construction.
deep and large foundation pitexisting subway lineenclosure structurestructural monitoring
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