Numerical Study Of The Row Piles Structure Supporting System Of A Deep Excavation In Qingdao

The development of economic and social promote rapid in the process of the city development. In recent years, the construction of high-rise buildings and urban rail, make the size and depth of the excavation gradually increase, and the excavation’s environment is more complex. Especially in dense urban areas for building construction, the excavation of soil’s deformation control, etc., have become the focus of research in the field of geotechnical And Geotechnical disciplines with strong regional characteristics, structure formation in each region of the soil is not same. So it is need to research on the various regions excavation. So in this paper Taking a deep row piles pit’s design and construction process in Qingdao as the research background, Pit design specifications and excavation site testing and numerical simulation is applied, and analyze the rules of deformation of row piles deep excavation and roe piles- Brace System under construction as time. The main work is as follows:First, Elaborate and analyze the development of deep excavation design’ process in the current research status at home and abroad. Analyze the advantages and disadvantages of various types of support methods and its applicability. Systematically summarized the factors which affect deep excavation design calculation theory, deep foundation supporting common method of deformation behavior of deep excavation retaining structure and the surrounding formations, deep foundation deformation and control measures. The current pit design mainstream methods such as the limit equilibrium method, finite element method are summarized; and analysis of the development process of all kinds of methods.Second, Via research the deep excavation monitoring data, explore the rules of Soil- pile- Inner Brace System’s stress diversification during excavation and soil body stress release process.Third. Take the finite element software as a platform, considering the actual working conditions, Using some simulation technology systems supporting piles is simplified, Select a reasonable mechanical parameters, establish the finite element model which can reflect actual excavation. Then analyzes the deformation of surrounding soil deep foundation and internal forces of the piles-variation Brace system under different construction conditions in Qingdao, the results can provide a reference for similar projects in Qingdao.Fourth, according to the numerical model which had been verified in Part three, the different axial force within the support pre, soil stiffness in different ways, such as the construction sequence of precipitation pit deformation was studied, and how these factors influence the internal forces of supporting system.