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设计并完成了1:20比尺的黄土边坡大型动力模型试验,探讨了模型试验中的相似律、边界条件处理等问题;研究了强夯激励下黄土边坡的动力特性变化规律与动力响应规律,以及边坡坡率对动力特性和动力响应的影响。试验结果表明,边坡坡率越大,动力响应幅值越大;强夯激励下黄土边坡的动力响应幅值均随冲击荷载作用而产生并迅速衰减;振动周期在1 s之内,主频率在25～45 Hz之间,不会出现振动叠加现象。强夯激励下黄土边坡对径向加速度的放大效应更显著,下部边坡以竖向振动为主,上部边坡以径向振动为主。黄土边坡的边缘部位对强夯冲击振动的反应幅值较之内部存在放大现象。沿坡高方向,边坡对输入加速度具有明显的放大作用,坡顶处的放大效应最为显著。试验结果有助于揭示黄土边坡在强夯激励下的动力响应规律,为黄土地区的工程设计和施工提供有益的参考。
The large-scale dynamic model test of loess slope with a 1:20 scale was designed and completed. The similarity law and the treatment of boundary conditions in the model test were discussed. The variation of dynamic characteristics and dynamic response of loess slope under dynamic compaction were studied. Regularity and slope slope on dynamic characteristics and dynamic response. The results show that the larger the slope slope is, the larger the dynamic response amplitude is. The amplitude of dynamic response of loess slopes is attenuated rapidly with the impact load under dynamic compaction. The vibration period is within 1 s, Frequency between 25 ~ 45 Hz, there will be no vibration superimposed phenomenon. Under dynamic compaction, the amplifying effect of loess slope on radial acceleration is more significant. The vertical vibration of the lower slope and the radial vibration of the upper slope are dominant. The response amplitude of the edge of loess slope to dynamic compaction shock vibration is larger than the internal amplification phenomenon. Along the slope direction, the slope has a significant amplification effect on input acceleration, and the amplification effect at the top of the slope is most significant. The test results are helpful to reveal the dynamic response law of loess slope under dynamic compaction and provide useful reference for engineering design and construction in loess area.