Optimum Design And Monitoring Research Of Pile Anchor Retaining Structure In Deep Foundation Pit

In this paper,based on the excavation of the foundation pit project,the relevant parameters of the finite element model are established by taking the B4 foundation pit project in Shenyang as an example.Research status on first through the application of monitoring technology at home and abroad and the finite element method in foundation pit engineering analysis in the analysis,understanding of foundation pit engineering by finite element method as the analysis way to deformation of foundation pit of the structure of the expression is intuitive and accurate,which using the finite element method for the design of the basic idea of deep excavation pile anchor retaining structure optimization.The analysis of engineering geology and engineering examples of the hydrogeological condition,which lays the foundation for the establishment of finite element model,considering the important influence of the construction process of deep foundation pit pile of foundation pit engineering quality and safety were analyzed in this paper,further construction of deep foundation pit,provide reference for the construction of similar projects.In order to analyze the reasons of foundation pit deformation,the surface settlement around foundation pit,pit bottom uplift and enclosure wall deformation mechanism of a detailed analysis on the deformation of foundation pit in three aspects,at the same time on the overall stability of foundation pit engineering,overturning stability and heave stability analysis theory to lay a theoretical foundation for the optimization design of deep pile anchor retaining structure of foundation pit.Subsequently,the ABAQUS finite element analysis platform is used to describe the soil properties by Mohr-Coulomb model,and then the three-dimensional numerical model is established.Based on the analysis of the distribution of displacement and deformation of the foundation pit,the displacement and deformation of the foundation pit are obtained.At the same time,the influence of with prestressed anchor and without prestressed anchor on the deformation of foundation pit is analyzed and compared.On this basis,optimize the comparative analysis of the design parameters of deep foundation pile anchor retaining structure,analyzed influence change respectively pile structure size,anchor on stability of different parts of excavation length and angle,have set the prestress in three aspects,effects of different design parameters for each part of the foundation pit and determine the optimal conditions of the foundation pit retaining structure design parameters,realize the optimization design of deep foundation pile anchor retaining structure using finite element method,for the follow-up to provide ideas and new experience of similar foundation pit engineering design.Finally,the statistical analysis of the data of horizontal and vertical displacement according to the monitoring data of the project site excavation surrounding land subsidence,the surrounding buildings and the vertical displacement of retaining piles,realizing numerical simulation analysis and experimental data,further validation of the finite element method of deep excavation pile anchor retaining structure optimization and effectiveness the accuracy of the design,provide a reference to optimize the design parameters of foundation pit for the subsequent use of finite element platform.