Data Analysis And Numerical Simulation Of Pile-anchor Support Monitoring In Deep Foundation Pit

With the continuous development of urban construction,modern buildings and infrastructure have been continuously improved,especially in the deep-pit engineering of urban densely populated areas.Deep foundation pit engineering is a highly integrated system engineering with multiple factors interacting.During the construction process,the foundation pit is in dynamic change,and the supporting structure and soil variation law at different parts and depths are not the same,so It is necessary to carry out all aspects of the foundation pit engineering.At the same time,through the numerical simulation technology,the stress and strain state of each part of the foundation pit can be more intuitively understood,thus providing guidance for the design and construction of the foundation pit engineering,and also a similar basis.Pit engineering provides a reference for theory and practice.This paper takes the deep foundation pit engineering of the outpatient medical technology building of the First Affiliated Hospital of Zhengzhou University as the research object,and uses the Midas/GTS finite element software to establish a numerical model to analyze the stress and deformation law of the key parts during the construction process of the foundation pit.The research contents are as follows:(1)Analyze the characteristics of each supporting structure of the foundation pit,and select the supporting scheme of the pile anchor support according to the actual situation of the project.According to the geological conditions of the foundation pit,the surrounding environment,the design requirements and the characteristics of the supporting structure,the monitoring plan for the foundation pit supporting structure was formulated.(2)Through comprehensive monitoring of the foundation pit and analysis of the monitoring data,the variation law of the research site during the construction process is obtained,and the generation of the law is analyzed.Judgment and early warning of the safety and stability of the foundation pit based on the monitoring data.(3)Using the Midas/GTS finite element software to establish a three-dimensional finite element model of the whole foundation pit,through numerical simulation analysis,the force and deformation data of the supporting structure and the soil under various working conditions are obtained.(4)Comparing the numerical simulation results with the measured data,the numerical simulation and monitoring data are within the range of early warning values,indicating that the foundation pit is safe and stable,and the maximum error rate of numerical simulation results and measured data is 7.3%,numerical model Can better reflect the real situation of the foundation pit.