哈佳高铁典型填方路堤的动力响应实验研究

Study on seismic response of typical fill embankment of Hajia high-speed railway

为研究填方路堤在地震动作用下的动力响应和损伤破坏过程,以哈佳高铁填方路堤为研究对象,设计比例尺为1∶20的填方路堤振动台模型。在两种地震波不同幅值和频率的激励下,实验研究模型路堤的动力响应和破坏过程。结果表明:在水平地震作用下,模型路堤对输入地震波具有明显放大作用,路肩处加速度峰值最大;沿路堤高程向上,水平地震波加速度峰值放大系数呈现波动,且坡面的放大系数大于路堤内部的放大系数;在逐级加载的地震波作用下,模型路堤逐渐出现多处开裂。该研究可为路堤的抗震设防提供参考。

This paper aims to investigate the seismic response and failure process of filling embankment subjected to the action of ground motion.The study building on the high-speed railway embankment in Hajia involves designing a shaking table model test of embankment with the scale of 1∶20,performing a series of tests in the presence of the excitation of two kinds of seismic waves with different amplitudes and frequencies and thereby identifying the dynamic responses and failure process of filling embankment.Results show that,exposed to the action of horizontal earthquake,the model embankment has a significant amplification effect on input seismic waves,with maximum acceleration peak value observed around the crest of the embankment;there are fluctuations found in the amplification coefficient of the horizontal seismic wave along the height of the embankment and the surface of the slope has a greater amplification coefficients than inside embankment;and there many cracks in the model embankment occurring due to seismic wave action of progressive loading.The results could inform a seismic design of embankment engineering.