Finite Element Simulation Of Deep Foundation Pit Excavation And Support

In recent years, Chinese economic and social development made great achievements, urbanization rate increasing.The basic construction such as urban construction, transportation, water conservancy result is remarkable. In the new round of urban infrastructure、 housing construction and municipal public facilities in the large-scale construction, Produced a large number of deep foundation pit engineering, And foundation pit size bigger and bigger, more and more deep foundation pit excavation depth, the engineering risk are also increasing. Not only ensure the safety and stability of deep excavation of foundation pit itself, but also effectively control the deformation of foundation pit caused by Controlling caused by the construction of foundation pit deformation, eliminating the influence on surrounding environment, the simulation analysis of foundation pit excavation process by using finite element method, the deformation mechanism of deep excavation, has an important guiding significance for the design and construction of deep foundation pit.In the paper, by collection of some useful literature documents.The supporting structure system commonly used at home and abroad are summarized, Pile of often used in deep foundation pit engineering, underground continuous wall, soil nail wall, slope excavation, supporting several methods of the supporting structure characteristics and application scope are analyzed, in this paper introduced the basic ideas, some of elastic-plastic theory, Including the Drucker-Prager yield criterion, the coulomb Mohr yield criterion, etc. Researched and analyses of the applications of finite element strength reduction method and strength subtraction problems and limitations.In this paper, combining with an engineering example in Zhengzhou city, Through the cases of excavation and supporting of deep foundation pit engineering information summary analysis, Using ANSYS finite element analysis program on analysis and calculation of actual excavation process. According to the results of numerical simulation, analyzed the influence factors of the deformation of foundation pit excavation. Focus on the development of foundation pit deformation and the plastic yield area of soil changes. This paper expounds the excavation process of the deformation mechanism of surrounding strata, According to the excavation progress, Analysis of the pile body displacement of retaining structure and the internal force variation regular, foundation pit supporting results are safe, Not well versed in the plastic zone. This is in well agreement with experimental results obtained lately.