地下结构对工程场地地震动场的影响

Influence of Underground Structures on Ground Motion Field of Engineering Site

本文以日本神户市地铁大开站为工程背景,应用大型通用有限元ANSYS软件,分别建立了自然条件下的工程场地土层和建有地下车站结构的土层的二维有限元分析模型。计算了基岩一致地震动输入模式下2个土层模型的动力反应。通过将2个土层模型的动力反应进行比较分析,讨论了地下结构对工程场地地震动场的影响。分析结果表明,日本神户地铁大开站的存在对其邻近区域土层的地震反应有影响,但影响有限。

Taking a subway station in Kobe city, Japan as the engineering example, we establish 2-dimensional finite element models of soil site in natural condition and with underground structure respectivelly. Then, seismic responses of two models were computed under excitations of uniform seismic wave. At last, by comparing difference between the dynamic responses of two models, influence of the underground structure on ground motion field of the site was discussed. The numerical results show that existence of Daikai subway station has influence on seismic responses of adjacent area of the soil to the underground structure, but such influence is limited.