The understanding of the dynamic behavior characteristics and mechanisms of seismic landslides in seasonal frozen soil areas following severe freeze-thaw damage is currently limited. Taking a compacted loess slope in Lanzhou National New Area of China as the prototype, freeze-thaw cycle tests and large-scale shaking table tests were conducted, and the dynamic responses of freeze-thaw slope and non-freeze-thaw slope under different amplitudes, directions, and intensities of seismic waves were compared and analyzed. The results indicate that the acceleration responses of compacted loess slopes increase with the increase of the slope height and the value of the slope shoulder is the largest. The acceleration responses also increase with higher seismic intensity. On the other hand, earth pressure responses decrease as the slope height increases, but initially increase with higher seismic strength before eventually decreasing prior to slope failure. Comparatively, the acceleration responses of the freeze-thaw slope are stronger than those of the non-freeze-thaw slope, while the earth pressure responses are smaller, particularly in frost-heaving zones The compacted loess slope demonstrates good stability under seismic waves. However, the loosed and wetted surface after freeze-thaw cycles may experience abrupt shear slip during high-intensity seismic waves. These findings hold significance for stability analysis and reinforcement strategies for engineering slopes in the Loess Plateau with seasonal freezing and thawing.

中文翻译：

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冻融循环和地震荷载作用下压实损失边坡动力响应特性研究

目前对严重冻融损伤后季节性冻土区地震滑坡的动力行为特征和机制的认识还很有限。以兰州国家新区某压实黄土边坡为原型，进行冻融循环试验和大型振动台试验，研究冻融边坡和非冻融边坡在不同振幅下的动力响应。对地震波的、方向和强度进行了比较和分析。结果表明，压实黄土边坡的加速度响应随着坡高的增加而增大，且坡肩的值最大。加速度响应也随着地震强度的增加而增加。另一方面，土压力响应随着斜坡高度的增加而减小，但最初随着地震强度的增加而增加，然后在斜坡破坏之前最终减小。相比之下，冻融边坡的加速度响应比非冻融边坡强，而土压力响应较小，特别是在冻胀区。压实黄土边坡在地震波作用下表现出良好的稳定性。然而，冻融循环后松动湿润的表面可能会在高强度地震波过程中经历突然的剪切滑移。这些研究结果对黄土高原季节性冻融工程边坡的稳定性分析和加固策略具有重要意义。