为研究边坡地形地貌条件对土质边坡动力响应规律的影响以及边坡地震反应机理,利用地震模拟振动台,建立不同坡面形态条件下的土质边坡模型进行振动台模型试验。试验结果表明:土质边坡地震动力响应具有高程放大效应,边坡加速度峰值(PGA)放大系数会随高程增加而增大,水平方向坡内土体较坡面土体对地震动荷载放大更为显著;土质边坡地形地貌条件对地震动荷载放大作用有较大影响,边坡坡度越大,边坡形态越复杂,其对地震动荷载放大效应越显著,边坡土体的变形破坏也越显著。

In this paper, we designed and conducted a set of shaking table model tests of soil slope according to the topographic and geomorphologic conditions of the slope. Based on the results, we examined the influence of the topographic and geomorphologic conditions on the dynamic response of the soil slope and studied the reaction mechanism of slope under earthquakes. Results demonstrated that the dynamic response of soil slope was closely related to the elevation of the slope. The amplification coefficient of peak ground acceleration (PGA) along the slope surface and in the vertical direction of the slope increased with the elevation increasing, and the amplification effect of soil inside the slope to earthquake waves was more significant than that of slope surface in the horizontal direction. The topographic and geomorphologic conditions of the soil slope had great influence on the amplification effect of earthquake waves. Generally, if the slope is steeper and more complex in shape, the amplification coefficient of PGA and the deformation of the slope will be greater.