Analysis And Numerical Simulation Of The Mechanical Characteristics Of A Deep Foundation Pit Pile-anchor Supporting Structure

In recent years,with the rapid development of urbanization in China,urban infrastructure construction has entered a new rapid development channel and Urban areas are often accompanied by the characteristics of useful and tense,which puts higher requirements on the deep foundation pit engineering.Under the complicated surrounding environment and the unsupported excavation conditions,the deep foundation pit must use safe and reasonable support.The form fits the excavation of the foundation pit,and the pile anchor support structure is a commonly used form of reliable support.The support system has good working performance,wide applicability and many other characteristics,so it has been widely applied to the foundation.Pit works and slope works.This article relies on a deep foundation pit project as an example,focusing on the following aspects of the discussion and analysis:1.Briefly summarizes the contents and characteristics of the deep foundation pit engineering,analyzes the types of support applicable to the soil-rock composite foundation in Guizhou,and simultaneously studies the research status of pile-anchor support structure and its problems in practical engineering applications.Description.2.The commonly used foundation slope slope analysis method,foundation pit deformation form,and geotechnical side pressure calculation mode are summarized and summarized to some extent,and the latter two are explained in detail.In addition,the composition and working mechanism of pile-anchor support structure are introduced,and the failure mode and stability influencing factors of pile-anchor support structure applied to deep foundation pit support are analyzed.3.The internal force calculation mode under the synergistic action of the pile-anchor support structure is analyzed.Based on the coordinated deformation conditions,the calculation formula of the anchor cable tension is derived by the theoretical formula,and the obtained anchor cable tension is brought into the support structure.The internal force of the supporting section and the anchoring section of thesupporting pile is obtained and successfully applied to the actual engineering project.4.The contents of real-time monitoring of deep foundation pit engineering are briefly summarized,and the measured displacement monitoring data of the supporting project is comprehensively analyzed.The first is to obtain the deformation law of pile-anchor support structure after deep foundation pit excavation by fitting the measured data.The second is to establish a gray GM(1.1)model by introducing the gray theory to predict the deformation of the supporting structure in a certain time after the excavation of the foundation pit.Finally,the concept and principle of information construction of foundation pits are introduced,which reflects the importance of monitoring the foundation pit engineering.5.Taking the supporting project as an example,the finite element numerical software is used to establish the three-dimensional model of the upper and lower support structures in stages,and the displacement and internal force distribution of the supporting structure in each construction stage of the foundation pit excavation construction are obtained through numerical calculation.A comprehensive analysis of the changes of the two is carried out.Finally,the theoretical calculation results,numerical calculation results and measured data are compared and analyzed.