Numerical Simulation Analysis Of Deep Foundation Pit Support

With the development of cities,the foundation pit has become an important geotechnical engineering in urban construction.Moreover,the deep foundation pit involved in the geotechnical engineering is located in the densely populated area of the city,which is the complex and changeable conditions of the surrounding geological environment in the proposed site.Considering the safety and stability of the foundation pit,the design of a reasonable foundation pit support scheme is the first premise,so that the deformation meets the requirements of the specification and does not pose a threat to the security and stability of the existing buildings.It is also very important to analyze the change rule and main influencing factors of deep foundation pit.This paper is based on the foundation pit project of a building in Beijing.The practical problems of different working conditions in deep foundation pit are transformed into mathematical problems and mathematical models are established.Using Midas/GTS finite element software to simulate soil horizontal and vertical displacement.The change of the horizontal displacement,bending moment and tensile stress of the surrounding structure in the excavation process of foundation pit.To predict the possible problems of excavation of foundation pit and to prevent it.And it also provides reference for other similar projects.Here's the study.(1)Based on the detailed investigation report of the site,a reasonable deep foundation pit support scheme is formulated,and the pile anchor support is selected in this paper.After the selection,the software is used to check the overall stability,anti-overturning safety factor,anti-uplift safety factor,and whether the surface settlement is the national standard,and the supporting parameters are put forward.(2)Using the finite element analysis software,meddas software establishes the numerical model of the foundation pit,simulates the excavation and supporting process of deep foundation pit and analyzes the response of each supporting parameter to the deformation of foundation pit.(3)The field monitoring data compared with the results of numerical simulation analysis,test and verify the reliability of the supporting scheme and the rationality of the model,come to the conclusion from the analysis,provide a reference for similar engineering construction.