On-Site Monitoring And Finite Element Analysis Of Deep Excavation Of Subway

Foundation pit engineering is an indispensable part of urban construction.The construction of deep foundation pits in subways is always planned in a more complex urban environment,which brings more difficulties to the construction process and is applied to the construction process.Various technologies and precautions are required.Empirical formulas are often used in the calculation of the deformation of the foundation pit.This calculation method lacks accuracy,which leads to serious wasteful consequences after construction.In this study,a subway foundation pit project was selected as the research object,and the excavation support activities of the foundation pit were studied.Based on the comparison between the data in the numerical simulation analysis and the implementation work,the deformation of the retaining structure and the supporting system was carried out.The influence of the foundation pit excavation was analyzed.Through this study,the design of the foundation pit engineering support and support system can be used as a very important reference.This paper starts with the development status of subways at home and abroad,briefly introduces the main features of the foundation pit engineering,and explains in detail the deformation characteristics of the foundation pit and its deformation mechanism.In addition,the following data was studied by monitoring data and the three-dimensional finite difference simulation software Midas GTS NX:The basic deformation mode and deformation mechanism of foundation pit deformation are introduced.The deformation factors affecting the deformation of foundation pit are analyzed from three aspects.2.Taking the deep foundation pit of the subway as the engineering background,through the statistical analysis of the on-site monitoring data,the deformation law of the retaining structure,the axial force of the steel support,the settlement of the buildings around the foundation pit and the variation of the surface settlement around the foundation pit are studied.3.Establish the Midas GTS NX finite element model,simulate the foundation pit excavation process,compare it with the measured data analysis results,and draw corresponding conclusions.Through the finite element model,the factors affecting the deformation of the foundation pit are analyzed from the aspects of design factors and construction factors,and the construction design method of the foundation pit is optimized and analyzed by the analysis results.