Finite Element Analysis Of Soil Nailing Support In Deep Foundation Pit Excavation

Supporting technology of the foundation pit is one of the difficult points and heated-discussed issues in geotechnical engineering.In this essay,the author combines the theoretical analysis and numerical calculation,and during the process of the deep foundation pit construction,the author selects one among numerous supporting schemes,such as underground continuous walls,bolts,gravity retaining walls,and retaining piles.In this deep foundation pit project,there is large slope space,so soil nails supporting is employed to ensure the safety of the foundation pit and surrounding buildings.In the essay,relevant research and discussions on the design of the supporting structure of the deep foundation pit have been carried out,which has played a very important role in the soil nailing,structure design,and the construction stage,thus providing sufficient data and laying a solid foundation for theoretical research.The author mainly studies the following parts: Firstly,through analysis of the current situation of deep foundation pit support,especially the development of soil nail support,the author points out a series of problems in the soil nailing engineering project.Secondly,the author conducts the research on bending shear stress and stability of soil nails.The essay focuses on the support and excavation of soil nails in deep foundation pits,analyses related research in China and other countries,and demonstrates a series of advantages in soil nailing supporting.In the project,gradient excavation is divided into six phases and soil nails are implanted five times.Finally,based on the design requirements and the parameters of the specification of soil nails calculated by finite element simulation,the author draws a conclusion by comparing and analyzing the monitored data and simulated data respectively.The author tries to use Plaxis,a finite element software,to calculate and monitor data in the soil nailing supporting in the Four Season Project(FSP)in Anqing developed by Anhui Zhidi.And during the construction,the author studies the deformation rules,monitors the construction site,and compares the data so as to prove that the procedures and methods employed in this essay are feasible.Therefore,the essay is of great value and offers guidance in soil nailing support of the deep foundation pit,structural design,and construction.This article mainly studies its contents as shown in the following aspects:1.Mainly introduce the research background of the thesis,the research status at home and abroad,and the research methods and technical routes of this paper.2.Introduce the supporting structure of deep foundation pit and its design and excavation,introduce the common deep foundation pit support form,design principle and experience of support form,calculation theory of earth pressure,internal force of deep foundation pit support system Calculation.The soil nail support technology of deep foundation pit was comprehensively analyzed,and the advantages of soil nail support and the applicable conditions of the project were introduced.3.Combine the general situation of the land and the four seasons project of the Wanjiangsiji and the design of the foundation pit retaining structure,the construction sequence of the foundation pit and the earth excavation plan and the foundation pit drainage plan.The key points and difficulties of the foundation pit construction are summarized and summarized.4.The paper briefly introduces the operation mode of Plaxis finite element analysis software,and introduces the modeling method of foundation pit,the process of simulation analysis,and the finite element model data.Through the post-processing mode of the software,the change of the displacement inside the pit can be accurately reflected.5.According to the actual monitoring report of the actual project,comparing the experimental data obtained by the finite element analysis simulation with the monitoring report,the reliability of the simulation results of Plaxis finite element analysis software can be verified,which provides a theoretical basis for future engineering construction.