Abstract: In view of the numerical simulation of the “model body-model box” system in tunnel shaking table test, the damping realization method of model foam boundary layer was analyzed by summarizing the dynamic finite element damping calculation method. The realization method of the bottom vibration input of the numerical model was discussed, and the calculation processes such as the large mass method and the displacement time-history input method were derived respectively. The calculation accuracy of the large mass method and the displacement time-history input method was compared and analyzed through the single-degree-of-freedom system. The advantages and disadvantages, as well as the feasibility in application of the proposed two methods were respectively analyzed. Taking the numerical calculation of a certain tunnel shaking table test as an example, the large mass method and the displacement time-history input method were respectively adopted to analyze the calculation models comparatively. The results show that the two proposed methods have similar overall accuracy in the numerical analysis of seismic action of the actual test model, but the large mass method is prone to produce cumulative displacement error.

Key words: tunnel engineering; model body; vibration input; damping realization; large

摘要： 针对隧道振动台试验中的“模型体-模型箱”体系数值模拟问题，通过总结动力有限元阻尼计算分析了模型泡沫边界层的阻尼实现方法。对数值模型底部振动输入的实现方式进行了讨论，分别推导了大质量法、位移时程输入法等计算过程，通过单自由度体系对比分析了大质量法和位移时程输入法的计算精度，分别讨论了两种实现方式的优缺点和在应用中的合理性；并以某隧道振动台试验模型的数值计算为例，分别采用大质量法和位移时程输入法对计算模型进行了对比分析，这两种方法在实际试验模型的地震作用数值分析中整体计算精度相近，但大质量法易产生位移累积误差。

关键词: 隧道工程；模型体；振动输入；阻尼实现；大质量法；位移时程输入法；数值计算