帶支錨環(huán)梁基坑支護(hù)體系有限元模擬及受力分析
[Abstract]:In the deep foundation pit supporting structure, the ring beam support structure has been widely used in practical engineering because of its large stiffness, good mechanical performance and convenient construction because of the formation of space rigid frame. Scholars at home and abroad have also done a lot of research on ring beam support. Although the design and calculation method of ring beam support structure is not perfect at present, the basic mechanical characteristics and working characteristics of ring beam support structure have been basically understood. The existing theories can guide the application of practical engineering. In recent years, though there have been some engineering examples for the ring beam supporting structure with supported anchors, it is lack of deep research and its working performance is not clear. According to the engineering example of deep foundation pit with bolted ring beam support structure at present, combined with the domestic and foreign research results in this field, In this paper, the mechanical properties of ring beam supporting structure with supported anchor are studied by using the finite element analysis software MIDAS-GTS. The main work is as follows: 1. The current research and application of ring beam supporting structure at home and abroad and the main calculation methods are summarized. The advantages and disadvantages of various methods and the existing problems are analyzed. 2. The finite element theory, stress and strain theory of soil mechanics, strength criterion of soil, elastic-plastic constitutive model, finite element analysis software MIDAS-GTS and Lizheng deep foundation pit software are introduced. 3. The three-dimensional finite element model of a foundation pit is established by MIDAS-GTS. The soil mass, retaining pile, bracing and prestressed anchor cable are considered as a three-dimensional space body in the analysis, and the characteristics of internal force and deformation of braced bolted ring beam supporting structure are analyzed. In addition, the influence of prestressing force, stiffness and position of anchor cable on the stress and displacement of ring beam supporting structure is analyzed and compared. 4. MIDAS-GTS is used to build the whole space finite element model of a project example to carry on the design calculation, the result is compared with the calculation result of the deep foundation pit of Lizheng, and the difference between the two calculation results is analyzed for the reference of the similar engineering in the future.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類(lèi)號(hào)】:TU470
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