Resarch On The Safety Of Large-span Metro Station Construction Throughbuildings

In the recently years,With the rapid development of urbanization,and the rapid growth of urban population,which has posed a serious challenge for the city's traffic travel.In order to ease traffic problems in the urban areas,a large number of national infrastructure has been planning constructed in our country,Especially,the sustainable development of urban subway.The rapid development of the subway brings convenient for people's travel,and time-saving go to work,and environmentally friendly,and revealsthe concept of green city.In the city,When the subway passthrough underground space,there are a amount of buildings above the surface,which is put forward strict requirementsthe design and construction technologyformetro station.particularly,when the large-span metro station through the complex city streets by undergroundexcavationtechnology,where the geological is complex and there are numerous buildings on the surface.metro station excavation area is large than 500m2,and span is more than 30 m,the construction is greatly difficult,which requirehighlytechnologyand accuracy design for metro stationconstruction.The metro station stress is quite complicated surrounding the rock wall,when themetro stationexcavating,if there is not safety and reliable design parameters supportedfor construct,the metro station is likely to produce large landslides.The subway station need to adopted the design of support parameters and construction technology,which is not only need to ensurethat the tunnel construction can not occur large deformation,but also ensure the security of the buildings above the station,which should be puts forward new challenges formany engineers.Currently,the design theory of large-span subway station needs to improving,the domestic large-span subway station construction is failedwhich have also been reported successively.this problem attribute to design theory or construction technology,which should have been analyzed and summarized for engineers.In this paper,I study on rail line VI station for the background in the Shang Xinstreet,using FLAC3 D finite element analysis software to calculation and analysis the excavation of metrostation,Combined with the station monitoring data on the construction site,in order to analysis construction mechanical properties of the large-span metro station construction as well as the safety of surface buildings:(1)using FLAC3 D finite element numerical simulation study the mechanical properties of subway station construction in the Shang Xinstreet,analyze the reasonableness of the construction method for the station structure,to ensure that the stability and safety of the station structure during the construction.(2)during the metro station excavation,analysis the surface building foundation settlement and deformation characteristics inclined.To grasp the changing rule of the surface buildings foundation,ensure that the stability of building foundation above the metro station construction area.(3)We contrast by numerical calculation and monitoring measurement data,judgment the stability of the metro station structure and the building foundation ground,and demonstrate the reliability of finite element numerical analysis method.