Study On The Construction Technology Of Excavation Engineering And Supporting Structure For The Deep Foundation Pit In Subway Station Wu Yi

With the rapid development of our economy and infrastructure construction,improving the urban traffic congestion road, urban rail transit constructionbecomes more and more important. The construction of urban rail transit willinvolve a lot of deep foundation pit engineering, construction areas of deepfoundation pit often are in road traffic is busy, the underground pipeline, populatedareas. So control the deformation caused by construction of foundation pit is verynecessary.This paper based on deep foundation pit construction engineering insubway Wuyi Square station line2in Changsha, and analyses the deep foundationpit construction design method of deep foundation pit construction methods andtechnical measures for research. The paper mainly works the contents as follows:1) on the analysis of a vast amount of literature at home and abroad, combinedwith the research methods of deep foundation pit engineering, this papersummarized the deep foundation pit deformation mechanism analysis research andtreatment measures analysis, and expounds the characteristics of deep foundationpit engineering.2) With the actual situation of deep foundation pit engineering on WuyiSquare station, designs the pit supporting structure and supporting systemconstruction, And introduces the deep foundation pit excavation and supportingprocess of construction method and study the technique measures.design andanalysis the waterproof every step of the construction in the deep foundation pitengineering, focus on the detail waterproof system and puts forward somecorresponding preventive measures.3) Using Mohr-Coulomb elastic-plastic yield criterion of the FLAC3Dsoftware,in the comprehensive consideration of the foundation pit excavation depth,geological conditions, grouting parameter setting, reinforced soil mass parametersof the factors such as basis, according to the construction process, in deepfoundation pit excavation and supporting the construction process, cause thepalisade structure of the displacement and ground subsidence is simulatedcalculation and analysis supporting structure deformation, ground subsidencemechanism analysis and steel strut axial forces change rule.4) With the excavation depth of gradually, combining with the monitoring data,prediction of surface subsidence caused by construction of foundation pit and thesupporting structure deformation, contrast the calculation analysis results and the monitoring results, the results show that the deformation of working conditions andthe measured results are basically the same.It has verified FLAC3Dnumericalsimulation software can well simulate the deep foundation pit excavation andsupporting structure construction process.This research has certain practical and JieJianXing, changsha area for futuresimilar engineering design and construction to provide the reference, and has veryimportant practical significance.