Study On Application Of Multiple Supporting Types In Deep Foundation Pit Engineering Adjacent To Subway Tunnel

With the continuous development of urbanization,the scale of the city continues to expand,and the urban population continues to expand.At the same time,the city construction of high density,shortage of land,traffic congestion and other problems continue to highlight the city traffic congestion problem has become an unavoidable topic in the development of a city,and the subway is to solve city traffic,alleviate the traffic pressure,promote the city's first choice.Therefore,the reasonable development and utilization of urban underground space,through the subway construction to ease traffic problems in large cities,is currently the best way to solve the problem of urban construction space.In the vicinity of the metro tunnel around deep foundation pit construction has become the norm,in the complex construction environment,to ensure their own safety in the pit at the same time,the control of stratum deformation caused by foundation pit construction,protect the adjacent metro tunnel construction and pipeline safety is a topic worthy of study.Combined with the foundation pit engineering of the reconstruction project of urban village in a nearby subway tunnel in Kunming,the influence of foundation pit excavation on the foundation pit itself,the existing subway tunnel and the surrounding environment is studied.First of all,different supporting styles of foundation pit are discussed,and then two kinds of different supporting schemes are established.According to the construction scheme,the analysis model for calculating the whole construction process of geotechnical finite element method analysis software MIDAS GTS NX established and corresponding supporting scheme based on comparative analysis of the deformation law of two different support schemes under the retaining structure,the bottom uplift and adjacent Metro tunnel.According to the particularity of the background project,this paper puts forward two different supporting schemes according to the north side support form,each has its advantages and disadvantages.Finally,the surrounding environment and tunnel deformation monitoring data are compared with the numerical results,and two kinds of foundation pit support forms are evaluated for the project.