Numerical Simulation With Fem On Deep Foundation Excavation And Timbering Design Of Metro Station

With the development of underground works, in our country deep excavation construction is carry out rapidly. Because of the increasing in depth of foundation pit, the process of deep excavation security has became seriously problem. In this paper, based on rapid rail transit underground municipal engineering of Zhengzhou, researchs the deep excavation for Construction of key technologies, according to the construction characteristics of deep excavation, studies deep foundation pit support action principle, checks the design of supporting structure by F-SPW, uses ANSYS to simulata the construction process of the deep excavation and so on, there are same thing as:1,The paper reviews the state of development of deep excavation works simply, introduces on china's recently development of the MTR, points out that the subway course of the development of deep excavation, defines the structure of deep foundation pit computational theory, to support design of deep excavation lay the theoretical foundation.2,The artcle takes Zhengzhou metro line 1 station deep excavation works for an example, based on F-SPW, selects row of piles and steel braces cladding system, divides the construction of deep excavation conditions, calculates the retain structure of the internal force and deformation values in the excavation process. The results show that the internal force and deformation values can meet the design requirements.3,The chapter introduces the finite element simulation theory of deep excavation, provides the theoretical calculation for the purpose of finite element simulation of deep excavation.4,Combining QILIHE station project, using ANSYS finite element software, the artcle introuces element selection,building modeling,parameter determination,boundary conditions and so on. Combination of deep excavation of the working conditions, the paper simulates the excavation pit the whole process step by step, obtains the results of stress fields,distortion value,bottom heave,bending moment,settlement quantity of the deep foundation pit, at the same time select the part of the monitoring results with the finite element simulation to compare, and it is correct that argumenting the finite element model and selecting the calculation parameters of the deep excavation process simulation. The structure of deep foundation pit excavation in the design process of checking and numerical simulation analysis shows that it is to meet the design requirements; Finite element analysis can able to provide a true reflection to the actual state in the process of the deep excavation, and the calculation results also can provide the actual situation. This simulation process and results provides a certain reference value for the same type of deep foundation pit structure.