Design Of Deep Foundation Pit Support And Numerical Simulation Of Excavation In West Square Of Xuzhou East Railway Station

The thesis first analyzes and summarizes the content,characteristics and research status of the foundation pit engineering at home and abroad,and then takes the deep foundation pit engineering of the west square of Xuzhou East Railway Station as the background,and comprehensively analyzes factors such as the depth of the foundation pit,the surrounding environment of the site,and the engineering geological conditions..At the same time,on the basis of statistical analysis of the characteristics and scope of application of different support forms,a comparative analysis of different support forms from both technical and economic aspects is carried out.The study believes that the more suitable plan for the deep foundation pit project in West Square is to use a single row of piles and two anchor cables to support the east side of the foundation pit,and to use secondary grading excavation and hang mesh spray anchor support for the remaining directions.Then a large amount of monitoring data such as horizontal and vertical displacement of steel sheet pile,surrounding ground settlement,anchor rod stress and groundwater level during on-site construction are analyzed.On this basis,using the Lizheng Deep Foundation Pit 7.0 software,according to the Xuzhou East Railway Station West Square deep foundation pit project,reasonable support structure parameters are selected,and the support plan design is calculated and optimized,and appropriate construction work is selected.The order of conditions is calculated,and the internal force and deformation values of the supporting structure under different conditions are calculated;stability analysis is also carried out at the same time.Finally,two engineering geological numerical model sections of the main section of the foundation pit are established,and the finite element numerical software is used to simulate and analyze the displacement field change characteristics of the deep foundation pit in the west square of Xuzhou East Railway Station under four working conditions.Through comparative and comprehensive research,it is concluded that the supporting structure of the deep foundation pit meets the design requirements.Monitoring and numerical simulation can better show the good condition of deep foundation pit excavation.The combination of Lizheng deep foundation pit supporting structure software and numerical simulation can provide a reliable reference for the design and construction of deep foundation pit projects with similar engineering geological conditions.There are 48 figures,22 tables and 63 references in this thesis.