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饱和土广泛存在于自然界之中,将土体视为固-液二相介质,基于biot饱和土介质动力方程的u-p形式研究了反映饱和土无约束域能量辐射效应影响的等效黏弹性人工边界单元,基于地震波转化为作用于人工边界节点上等效荷载的方法实现了波动输入。采用算例验证了等效人工单元的精度。建立饱和土-地铁车站非线性有限元整体模型,分析了考虑双相介质饱和土的波动传播,对比了饱和土及单相土在地震作用下地铁车站的地震反应,并与振动台试验结果进行了比较,研究表明:地震作用下采用考虑多孔介质的特性分析地基土与单相固体介质相比更加合理。通过对车站结构关键构件的加速度、位移和内力等进行分析,研究了饱和土-地下结构相互作用体系的地震反应。
Saturated soil widely exists in nature and considers soil as solid-liquid two-phase medium. Based on the up form of biot saturated soil medium dynamic equation, the equivalent viscoelastic artificial boundary reflecting the energy radiation effect of unconstrained domain of saturated soil Units, based on the conversion of seismic waves into equivalent loads acting on artificial boundary nodes, achieve a fluctuating input. An example is used to verify the accuracy of the equivalent artificial unit. The nonlinear finite element model of saturated soil-metro station is established. The wave propagation of saturated saturated soil with two-phase medium is considered. The seismic response of metro station under saturated soil and single-phase soil is compared. The results are compared with the results of shaking table test In comparison, the results show that it is more reasonable to analyze the characteristics of porous media under the action of earthquake compared with single-phase solid media. By analyzing the acceleration, displacement and internal forces of the key components of the station structure, the seismic response of the saturated soil-underground structure interaction system is studied.