Research And Application Of Deformation Law Of Deep Excavation In North Lake New Area Of Changchun Based On Finite Element Analysis

Changchun Beihu New District is the 17 th national-level new district.It is an important measure to promote the construction of the “Belt and Road” and accelerate the revitalization of a new round of old industrial bases in the Northeast,and plays an important supporting role in economic development and overall revitalization in the Northeast.The geological conditions of the North Lake in Changchun are complex.The control of the deformation of the deep foundation pit is an important prerequisite for the safe construction of the foundation pit.It is necessary to consider the impact of the foundation pit excavation on the surrounding environment while ensuring the safety and stability of the foundation pit retaining structure.The deformation of the retaining structure of the deep foundation pit and the surrounding soil is affected by factors such as design factors,geological factors and construction factors.At present,it is impossible to accurately calculate the deformation value through the existing theory.The vast number of geotechnical engineers are in the area.When designing deep foundation pits,it is necessary to study the deformation law of deep foundation pit engineering in this area.Based on the deep foundation pit engineering of Changchun Beihu New District,this paper analyzes the deformation law of typical deep foundation pit engineering in the Beihu New Area of Changchun based on the theoretical study of deformation calculation method,deformation mechanism and deformation law of the deep foundation pit.MIDAS GTS NX finite element software takes the Wuyue Plaza project in the region as an example to carry out three-dimensional finite element simulation analysis and optimize the design parameters.Concluded as follow:1.From the three aspects of foundation pit deformation law,finite element analysis method and foundation pit monitoring method,the current research status of deep foundation pit deformation at home and abroad is expounded,and the process and technical frontier for the study of foundation pit deformation law are fully understood.2.Theoretically,the theory of deformation of foundation pit is summarized,including: deformation calculation method,deformation phenomenon,deformation mechanism,deformation influence factor and deformation control measures of deep foundation pit engineering.3.The three typical deep foundation pits in the Beihu New District of Changchun were summarized and analyzed in detail,and the characteristics of the stratum conditions and environmental conditions in the area were summarized.The typical deep foundation pit supporting scheme of the area was detailed.Analysis,statistical analysis of monitoring data,to understand the characteristics of foundation pit deformation under various working conditions,analysis and study of the deformation characteristics of its envelope structure.4.Case analysis of the deep foundation pit project of Changchun Beihu Wuyue Plaza to determine the project support plan and monitoring method.According to the on-site monitoring data,the horizontal displacement of the retaining structure and the surrounding ground settlement deformation law are analyzed.The whole process model of deep foundation pit excavation and support was established by MIDAS GTS NX finite element software.Numerical simulation analysis was carried out to analyze the deformation characteristics and deformation law of foundation pit,and the simulation data and monitoring data were compared and analyzed.5.On the basis of summarizing the deformation law of foundation pit,the stiffness,embedding degree,anchor prestress and bolt position design parameters of deep foundation pit engineering are optimized and analyzed,and the influence of different design parameters on deformation is analyzed.Optimal design parameters to reduce construction difficulty and save engineering costs.This paper studies the deformation law of deep foundation pits in the Beihu New District of Changchun,and provides first-hand information for the design of similar projects in the region.It is particularly important to play a good reference and guidance for the construction of similar deep foundation pits in the region.Significant.