为探讨土-结构相互作用(SSI)对惯性约束聚变(ICF)装置在地脉动作用下响应的影响，建立了某ICF装置刚性地基和柔性地基两种有限元模型。通过设置人工虚拟边界的弹簧单元和阻尼装置来考虑SSI效应，并且通过设置具有概率意义的弹簧刚度和阻尼系数，来模拟岩土特性参数的不确定性。两个模型地脉动随机响应结果的对比分析，揭示了柔性地基条件下SSI效应及岩土地基参数不确定性对装置的影响。研究表明，考虑岩性地基的柔性时，ICF装置主要部位的位移响应和转角响应分别放大了1.24和1.49倍。

In order to study the influence of flexible foundation on the stability of ICF facility due to ambient vibration, two models are established for the “rigid” foundation and the flexible foundation, respectively. The soil-structure interaction (SSI) is considered by setting the springs and dampers on the dummy boundary, and uncertain soil properties are simulated by setting some stochastic parameters for stiffness of the springs and damping factors of the dampers. The influences of SSI and uncertain soil properties on the response of ICF facility are revealed by comparing simulation results of the two models.The ratios of the major displacement response and the rotation response in the flexible foundation model to those in the “rigid” foundation model are 1.24 and 1.49, respectively.