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为研究砂土边坡的地震响应规律,采用El Centro波作为地震输入,在50倍重力加速度条件下进行边坡的动力离心模型试验。试验在土工离心机及专用振动台上实施,利用加速度传感器记录模型不同位置地震响应的加速度时程并进行频谱分析。结果表明:最大响应发生于坡顶,该处地震波反应谱放大系数最大值为4.78。地震波反应谱不同频率成分放大效果不同,与5.7~6.7 Hz的频率成分相应的反应谱放大最大。边坡自下而上存在地震响应放大现象,边坡上部响应大于底部,靠近边坡斜面的响应大于内部。
In order to study the seismic response law of sand and soil slope, El Centro wave is used as input of earthquake, and dynamic centrifugal model test of slope is carried out under 50 times of gravity acceleration. Experiments were carried out on a geocentrifuge and a dedicated shaker table. Acceleration sensors were used to record the acceleration time histories of seismic responses at different locations of the model and to perform spectrum analysis. The results show that the maximum response occurs at the top of the slope, where the maximum amplitude amplification factor of seismic wave response spectrum is 4.78. Seismic response spectrum of different frequency components amplification effect is different, and 5.7 ~ 6.7 Hz frequency components corresponding to the largest amplification of the response spectrum. There is seismic amplification phenomenon from the bottom to the top of the slope. The response of the upper part of the slope is greater than that of the bottom part and the response of the slope near the slope is larger than the inner part.