Analysis on the Influence of Large Area Unloading of Foundation Pit Construction on Existing Subway Tunnel
In order to solve the impact of urban foundation pit excavation on the subway section tunnel below,taking the Xi'an Taihua Road to North Second Ring Interchange Underground Comprehensive Pipe Gallery Project crossing Metro Line 4 as the background,the pit bottom replacement treatment measures were taken to control the subway and tunnel deformation,and through the combination of nu-merical simulation and on-site monitoring,the subway and tunnel deformation in the construction process was obtained,so as to evaluate the reliability of the numerical simulation method used in the project.The results show that the excavation of the case foundation pit a-dopts the scheme of enclosure pile and internal support,and the method of ground replacement and reinforcement at the bottom of the pit,which effectively reduces the tunnel deformation.The horizontal displacement is basically 0 mm,the vertical uplift value is 8.7 mm,the maximum cumulative settlement of the interval tunnel is 15.19 mm,and other relevant technical indicators meet the safety requirements.
foundation pit excavationnumerical simulationdeformation controlsubway section
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