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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。
In view of the fact that underground continuous walls exist in common design method and anti-seismic analysis method of existing underground underground station structures, the static-dynamic coupling nonlinearity of continuous underground-underground structures is established based on numerical calculation method Interaction finite element analysis model to analyze the underground continuous wall presence of submarine underground station main structure of the seismic response of the law. The results show that the existence of underground diaphragm wall can improve the anti-horizontal displacement ability of the main structure of metro station significantly, so that the maximum relative displacement between the top and bottom of the metro station can be significantly reduced. From this result, it seems that the underground seismic wall can be regarded as the seismic safety reserve for underground structures without considering underground continuous walls in the seismic analysis of underground structures. However, the presence of underground continuous walls obviously changes the overall deformation of the subsurface structure, which leads to the redistribution of the internal forces of the subsurface structure. In particular, the seismic damage of some key parts of the top, middle and bottom of the station structure is obviously less than that of the earthquake Considering the underground continuous wall, it should be serious; meanwhile, the diaphragm wall also has a significant influence on the relative frictional shear between the top and bottom surface of the station structure and soil.