Deformation Monitoring And Numerical Simulation Analysis Of Subway Foundation Pit In Suzhou Soft Soil Area

With the rapid development of China's economy and the gradual acceleration of urban development,rail transit has entered a booming era,and more and more subway deep foundation pits appear.Because in the city,the surrounding environment of the subway pit is very complex.The process of excavation is very easy to cause engineering accidents.Therefore,controlling the deformation of foundation pit and ensuring the smooth development of foundation pit engineering is of great significance.China's vast territory,different geological features of different regions is large,has a strong regional foundation pit engineering,design and construction are limited to the engineering geological conditions of Suzhou as the typical soft soil area,the subway is still in the initial stage,according to the requirements of the construction of city subway construction,Suzhou will usher in the climax,so the study of soft soil in Suzhou area,subway pit deformation is very necessary,based on the Suzhou metro line three subway station pit in Xingang street,actualmonitoring data,by means of mathematical statistics,theoretical analysis,numerical simulation and other means,in-depth research on the deformation law of Xingang street subway excavation,the research process and the main contributions are as follows:(1)Access to the relevant literature and excavation,foundation pit deformation theory domestic and abroad,and makes a summary,as the basis of study on deformation of foundation pit,and compared with the monitoring results of Xingang street,analysis the influence factors on the deformation of foundation pit.(2)The consolidation of Suzhou metro line three station Xingang Street engineering investigation report,design,construction organization and site monitoring data of deep foundation pit in Suzhou soft soil area subway supporting structure lateral displacement and regularity of surrounding surface subsidence.(3)From the view of engineering practice,analysis of Xingang Street Station enclosure wall top vertical displacement of large area up early warning of abnormal situation,analysis of the effect of bottom unloading caused by diaphragm wall displacement,based on residual stress method and Boussinesq solution,the calculation formulas of wall displacement,at the same time considering the temperature and other factors on the impact of wall vertical deformation.(4)By using the finite element software MIDAS GTS NX,a three-dimensional numerical model of Xingang Street Station subway excavation,and the results were compared with the monitoring data of numerical simulation,found that they are basically consistent,reasonable parameters of numerical simulation,it can provide the reference for the similar similar process...