【摘要】 混凝土面板堆石坝的加速度地震反应是其设计和运行中参考的主要依据之一。由于数值方法难以准确模拟土石填筑材料的复杂特性,振动台模型试验被应用于高面板坝坝体的加速度地震反应研究。本文通过对紫坪铺面板堆石坝的大型振动台三维模型试验,得到不同地震动工况下加速度在坝体中的分布以及加速度放大倍数沿坝高的分布。研究发现,在输入加速度幅值较低时坝体的加速度放大倍数最大值出现在0.8倍坝高左右,放大倍数随着输入地震动幅值的增大而减小,并且放大倍数极值出现位置逐渐上移到坝顶。相同高程测点的加速度反应,下游坡面最大,坝体内部加速度小于坝体表面加速度。更多还原

【Abstract】 The acceleration seismic response of CFRD is one of the primary basis for the designing and operating.It is difficult to simulate the complex characters of earth-rock material by numerical calculation,So the shaking table model test is used in the study for acceleration seismic response of high CFRD.The 3D shaking model test of Zipingpu CFRD is carried out,and the distribution for the amplification factor of acceleration along the relatively height with different earthquake motions is obtained.It is concluded that the maximum amplification factor is located in the 0.75 times height of the dam.The amplification factor increases with the decrease of acceleration amplitude input,and the maximum factor gradually moved up to the top of dam.Acceleration seismic response of the measurement points with the same elevation in downstream slope is the largest,and the acceleration on the surface is larger than that inside.更多还原