Numerical Simulation Analysis Of Supporting Structure Of Deep Foundation Pit In Huashan Road Station Of Hefei Metro Line 5

In the process of subway construction,deep foundation pit support is an unavoidable difficulty,not only because of the great difficulty coefficient of the structure itself,but also because of the area where the project is located.In densely populated urban areas,once a safety or quality accident happens,it will cause severe casualties and property losses,and the consequences are unimaginable.Therefore,it is necessary to strengthen the research of deep foundation pit supporting technology in subway station.Based on Huashan Road Station of Hefei Metro Line 5,this paper studies and analyzes the supporting technology of deep foundation pit of metro station.With the help of two geotechnical engineering analysis software(MIDAS--GTS and Beijing Lizheng),the simulation calculation of the whole process of deep foundation pit excavation and support in subway station was carried out,and the change rules of the influencing factors on the stability of the deep foundation pit support system in subway station were obtained,which were applied to the follow-up construction of Hefei subway.The main contents of this paper are as follows:(1)Collect,read,sort out and summarize a large number of professional literature on deep foundation pit supporting technology,summarize the deformation and failure mechanism and manifestation of deep foundation pit,and list the common supporting methods and systems in deep foundation pit engineering of subway station.By selecting the same or similar supporting system as the supporting project,some conclusions about the supporting technology of subway station foundation pit are drawn.(2)This paper introduces the actual situation of the deep foundation pit project at Huashan Road Station of Hefei Metro Line 5,and compares the experimental group with the supporting structure of the deep foundation pit,and carries out the modeling calculation of geotechnical analysis software.(3)Based on MIDAS-GTS of three-dimensional modeling adopted in the Mohr-Coulomb elastic-plastic constitutive model,the surface subsidence and the deformation of retaining structure caused by the excavation and support of deep foundation pit in Huashan Road Station of Hefei Metro Line 5 are calculated by modeling,then Beijing motivation is used to review the previous results ofgeotechnical software.By analyzing the calculation results of two different kinds of software,it is found that the displacement and deformation of deep foundation pit and the change of internal force in the supporting system of subway station are basically the same under each simulated working condition,so as to verify that MIDAS-GTS can better reflect the specific changes of the influencing parameters in the excavation and supporting process of deep foundation pit of subway station.In recent years,along with the subway station deep foundation pit excavation and the support technology unceasing innovation,the foundation pit support form is more d iverse.Based on the summation of the types of deep foundation pit support and the co mparison and analysis of software simulation,this paper puts forward some existing pr oblems and prospects the development trend of deep foundation pit support technology in subway station.Figure [57] table [10] reference [50]...