地下连续墙对叠合墙式地铁车站结构地震反应的影响研究

发布时间：2018-02-15 07:17

本文关键词： 地下结构地下连续墙抗震性能地震损伤土与结构相互作用　出处：《岩土工程学报》2017年08期 　论文类型：期刊论文

【摘要】：针对现行地铁地下车站结构的常见叠合墙式结构设计方法和抗震分析方法中不考虑地下连续墙存在的现实情况,基于数值计算方法,建立了土地下连续墙地下结构静动力耦合非线性相互作用有限元分析模型,分析了地下连续墙存在时对地铁地下车站主体结构地震反应的影响规律。研究结果表明:地下连续墙的存在对地铁车站主体结构的抗水平侧移能力有一定的提高作用,使得其顶底间的最大相对位移有显著减小。从这一结果出发,似乎可以认为地下结构抗震分析中不考虑地下连续墙时可看作是地下结构的地震安全储备。但是,地下连续墙的存在明显改变地下结构的整体变形性态,进而导致地下结构的内力发生重分布,尤其使得大震时车站结构的顶、中、底板一些关键部位的地震损伤程度明显比不考虑地下连续墙时要严重;同时,地下连续墙对车站结构顶底板表面与土体间的相对摩擦剪力也产生明显的影响。
[Abstract]:In view of the common design method of superimposed wall structure and seismic analysis method of underground subway station structure, the practical situation of underground continuous wall is not considered, and the numerical calculation method is used to solve the problem. The finite element analysis model of static and dynamic coupling nonlinear interaction of underground structure with earth diaphragm wall is established. The influence of underground continuous wall on the seismic response of the main structure of underground subway station is analyzed. The results show that the existence of underground continuous wall can improve the ability of resisting horizontal lateral displacement of the main structure of subway station to some extent. The maximum relative displacement between the top and bottom is significantly reduced. From this result, it seems that the seismic safety reserve of underground structure can be considered when the diaphragm wall is not considered in the seismic analysis of underground structure. The existence of underground continuous wall obviously changes the whole deformation behavior of underground structure, which leads to the redistribution of internal force of underground structure, especially to the top and middle of station structure when large earthquake occurs. The seismic damage degree of some key parts of the floor is obviously more serious than that of the underground continuous wall, and at the same time, the relative friction shear force between the top and bottom slab surface and soil of the station structure is obviously affected by the underground continuous wall.
【作者单位】：南京工业大学岩土工程研究所;江苏省土木工程与防灾减灾重点实验室;
【基金】：国家自然科学基金面上项目(51278246) 江苏省自然科学基金面上项目(BK20141458)
【分类号】：TU311.3;TU93

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