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以静力平衡法为依据的传统支护结构计算方法已难以满足工程的需要,而较为理想的连续介质有限元法又由于理论本身复杂、参数多、本构模型难以确定等多种因素而应用较困难。弹性地基梁杆系有限元法因能考虑支护结构的平衡条件和结构与土的相互作用、分析中所需参数简单等诸多优点在基坑工程中有着广泛的应用。根据杆件有限元法的基本原理对武汉地铁2号线某站点深达15.31m、采用3道水平支撑的复杂基坑支护结构进行了设计计算,并对所得计算结果进行了分析,推出了基坑支护结构的变形、内力随工况变化的规律。
The traditional support structure calculation method based on the static balance method has been difficult to meet the needs of the project, and the ideal continuous medium finite element method due to the theory itself is complicated, the parameters are many, the constitutive model is difficult to determine and other factors More difficult. Because of the balance condition of supporting structure and the interaction between structure and soil, the finite element method of the beam system of elastic foundation can take a wide range of application in the foundation pit engineering due to the simple parameters required in the analysis. According to the basic principle of the finite element method of bar element, the design and calculation of a complex foundation pit supporting structure with 3 horizontal supports is carried out on a site of Wuhan Metro Line 2 which is as deep as 15.31m. The calculated results are analyzed and introduced The deformation and internal force of foundation pit supporting structure change with the working conditions.