The large-scale shaking table model test, which can directly reproduce the process of slope instability and failure, is an important technical means for the prediction and evaluation of slope seismic stability. However, up to now, the systematic slope stability evaluation method based on the shaking table slope model test has not been established, which limits the application of the expensive shaking table model test in slope seismic design. Therefore, the slope stability evaluation method based on the model test needs to be developed and innovated. In this research, through three loess slope model tests with different rainfall, according to the change law of the peak value of transfer function spectrum, combined with the macrodestructive characteristics of the slope model, an accurate calculation method of the critical instability acceleration of the slope is proposed. Based on the behavior similarity theory, for the shaking table model test of slope whose soil cohesion cannot meet the similarity ratio, the reduction method of applying the critical instability acceleration obtained from the model test to prototype slope is proposed. Based on first-order natural frequency and damping ratio extracted from the TF spectrum curve, a calculation method for the stability factor F_s of loess slope based on the shaking table model test is proposed, and the stability factors of loess slope under the action of different seismic ground motion would be quantitatively calculated. The above methods provide another effective way for qualitative prediction and evaluation of seismic stability of loess slope.

中文翻译：

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基于振动台模型试验的黄土边坡地震稳定性定量评价方法

大型振动台模型试验可以直接再现边坡失稳破坏过程，是边坡地震稳定性预测和评价的重要技术手段。然而，迄今为止，基于振动台边坡模型试验的系统边坡稳定性评价方法尚未建立，限制了昂贵的振动台模型试验在边坡抗震设计中的应用。因此，需要开发和创新基于模型试验的边坡稳定性评价方法。本研究通过三种不同降雨量的黄土边坡模型试验，根据传递函数谱峰值的变化规律，结合边坡模型的宏观破坏特征，提出了边坡临界失稳加速度的精确计算方法。基于行为相似理论，针对土体黏聚力不能满足相似比的边坡振动台模型试验，提出了将模型试验得到的临界失稳加速度应用于原型边坡的折减方法。基于从TF谱曲线中提取的一阶固有频率和阻尼比，一种稳定因子的计算方法提出了基于振动台模型试验的黄土边坡F _s，定量计算了不同地震地震动作用下黄土边坡的稳定性系数。上述方法为黄土边坡地震稳定性的定性预测和评价提供了另一种有效途径。