Numerical Simulation Study On Bracing Of Deep Foundation Pit In Complex Urban Area

The rapid development of social economy has increased the scale of the city,accompanied by a considerable number of deep foundation pit,although the foundation pit engineering development and research has been for some time,but according to local conditions to find the most appropriate support program,effective The control of the pit produced by the displacement deformation and reduce the cost of the project,there is still a lot of work to do.In this paper,the foundation pit engineering of Shenzhen Shengrunfeng Exhibition is taken as an example.By means of PLAXIS geotechnical analysis software,each stage of excavation support is analyzed on the two-dimensional plane by numerical simulation.This paper focuses on the stability of the foundation pit,the supporting structure and the deformation of the subway station structure.The internal force and deformation of the supporting structure under each working condition are calculated and calculated.Finally,the stability of the foundation pit is verified by rational software,And PLAXIS simulation of the conclusions of each other to prove that the simulation of the accuracy of the data.The main work and conclusions are as follows:1?The design and calculation theory of foundation pit support structure is systematically analyzed.Based on the requirements and design principles of foundation pit support to the design method,structure and application conditions of supporting structure,the present situation of foundation pit support and the related problem.2?The principle of the finite element method is described in detail.At the same time,the finite element software PLAXIS of large geotechnical engineering is used in this paper.The two typical constitutive models are briefly analyzed,and the relevant structural elements Made an overview.3?Based on the engineering example,the finite element software PLAXIS is used to consider the basic pit support in the south of the subway station.The relevant data are obtained by numerical simulation in the two-dimensional plane.Each stage ofthe excavation is analyzed,The deformation and internal force distribution of each excavation stage.Finally,the results are verified and the validity of the model is established.4?Considering the relevant factors that affect the stability of the foundation pit,including the stiffness of the wall,the depth of the wall,the stiffness of the supporting structure,the excavation width and the parameters of the soil,the displacement of the foundation pit under different value,To find a relatively reasonable parameters,the displacement of the supporting structure is investigated from different aspects,and the qualitative and quantitative analysis of the relevant elements is also made,which provides some experience for the later work of the foundation pit.