Loess tablelands are widely distributed in the center of the Loess Plateau. The percentage of the Loess Plateau area that experiences seismic intensities greater than or equal to level VII is 54.21%. Because of the gravity of the loess slope and a large number of vertical pores, the fissures are mostly developed in the Loess Plateau. The fissures can easily cause slope instability subjected to earthquakes. Considering the structural characteristics of loess tableland slopes and earthquakes, a shaking-table test on slope models with and without fissures is conducted to study the dynamic response characteristics and the law of deformation and instability of the slopes under seismic action. The results indicate that the amplification factors of peak ground acceleration (PGA) in the vicinity of the fissures in the loess slope are significantly higher than those in the non-fissure slope, which reaches a maximum value of 3.6 at the shoulder of slope (measuring point A15). Dynamic earth pressures have stress concentration in the middle and upper part (0.7 times slope height) near the fissure, which affects the variation law of slope earth pressure. The failure mode of the fissure slope is as follows: fissure development, fissure expansion, soil collapse at the slope shoulder, shear failure at high-position on the slope, shear failure at low-position on the slope, and formation of new fissures at the edge of the tableland.

中文翻译：

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基于振动台模型试验的黄土台地边坡动力响应特性及破坏模式

黄土高原广泛分布于黄土高原中部。黄土高原地震强度大于或等于VII级的面积占54.21%。由于黄土斜坡的重力和大量的垂直孔隙，裂隙多发育于黄土高原。裂缝容易造成边坡在地震作用下失稳。考虑黄土台地边坡和地震的结构特点，对有裂隙和无裂隙边坡模型进行振动台试验，研究了地震作用下边坡的动力响应特征和变形失稳规律。结果表明，黄土边坡裂隙附近的峰值地面加速度（PGA）放大系数明显高于非裂隙边坡，在坡肩处达到最大值3.6（测点 A15)。动土压力在裂隙附近的中上部（坡高的0.7倍）有应力集中，影响了边坡土压力的变化规律。裂隙边坡的破坏模式为：裂隙发育、裂隙扩展、坡肩土体坍塌、边坡高位剪切破坏、边坡低位剪切破坏、新裂隙形成。台地的边缘。6 在斜坡的肩部（测量点 A15）。动土压力在裂隙附近的中上部（坡高的0.7倍）有应力集中，影响了边坡土压力的变化规律。裂隙边坡的破坏模式为：裂隙发育、裂隙扩展、坡肩土体坍塌、边坡高位剪切破坏、边坡低位剪切破坏、新裂隙形成。台地的边缘。6 在斜坡的肩部（测量点 A15）。动土压力在裂隙附近的中上部（坡高的0.7倍）有应力集中，影响了边坡土压力的变化规律。裂隙边坡的破坏模式为：裂隙发育、裂隙扩展、坡肩土体坍塌、边坡高位剪切破坏、边坡低位剪切破坏、新裂隙形成。台地的边缘。