相对刚度对圆形隧道结构地震反应影响规律的研究

隧道结构与周围地层的相对刚度是两者之间相互作用的根本,本文针对圆形隧道,采用动力有限元方法分别讨论了土质条件(剪切波速)、衬砌厚度、衬砌直径等参数对结构地震反应的影响规律。然后引入柔度比的概念来综合考虑上述因素的影响。计算结果显示:柔度比越大,隧道结构的地震内力反应越小,并且对计算结果进行拟合得到衬砌内力与柔度比的函数关系,可以作为隧道结构抗震分析、设计的参考。

Effect of Relative Stiffness on Seismic Response of Circular Tunnels

The relative stiffness of buried tunnel lining for surrounding rock or soil is the essential factor that affect the interaction of the coupled system.In this paper,dynamic finite element method is applied to analyze the influence of such factors as the stiffness of the soil,the lining thickness and diameter on the seismic response of circular tunnels,with the conception of flexibility ratio introduced to consider these factors synthetically.The result shows that the seismic response of tunnels decreases as the flexibility ratio increases. Also,the result is fitted to obtain the function form of the relation of internal force of tunnel lining with the flexibility ratio,which could be the reference to seismic analysis and design of buried circular tunnels.