锚索框架梁加固平面滑动型边坡地震动力响应

设计并完成了一个缩尺比例为1:20的锚索框架梁加固平面滑动型边坡的振动台试验，通过改变输入地震波类型和峰值，研究了边坡体及支护结构的动力响应特性。试验结果表明：锚固边坡体的整体稳定性较好，地震造成的破坏主要为滑体顶部震碎和无约束坡面岩土体剥蚀、掉块；地震波在经过软弱夹层时存在能量聚集效应，不同地震波下滑体重心处加速度放大系数的差异性随输入地震波峰值的增加而减小；锚索在地震时表现出协同工作的特性，预应力损失最先发生在坡顶，然后向坡体中下部转移；在锚索框架梁的抗震设计时，应考虑边坡体上部的加速度放大效应和锚索预应力损失对边坡整体稳定性的影响。试验结果为合理考虑预应力锚索框架梁的抗震设计提供有益的参考。

Seismic response for plane sliding of slope reinforced by anchor-chain-framed ground beams through shaking table test

In this study, the model test with the geometric scale of 1:20 was performed to study the behaviour of the slope reinforced by prestressed anchor cable under earthquake conditions. Inputting seismic waves and excitation amplitudes were adjusted to investigate the acceleration and displacement responses of the reinforced slope and the dynamic force characteristics of the retaining structure according to the similitude law. The results showed that the rock at the top of the slope was shattered, and denudation and rockfall at the lower part of frame beam occurred, but the overall stability of the anchored slope remained well. During the propagation process of seismic wave, there was an energy accumulation effect in the weak interlayer. With the increase of the amplitude of inputting seismic wave, the diversity of centrobaric acceleration amplification coefficient decreased under different earthquake waves. The mechanism of pre-stressed anchor cables showed the characteristics of collaboratively at different altitudes. The prestress loss occurred at the top first and then gradually transited to the lower-middle part. In the seismic design of the anchor cable frame system, it is significant to consider the acceleration amplification effect of the upper part of the slope and the prestress loss of the cable for the overall stability of the slope. The experimental results provide useful references for the seismic design of the prestressed anchor cable frame system.