面板堆石坝最大加速度放大倍数经验公式

Empirical Formula for Calculating Maximum Acceleration of Concrete-faced Rockfill Dam

对面板堆石坝进行三维动力反应计算分析,采用等价线性化模型以不同坝体高度、不同河谷形状为对象,研究了输入不同地震波坝体的反应.结果表明,在坝高相同、基础输入加速度不变情况下,随河谷宽度增加,坝顶坝轴线最大加速度位置由中间向两岸对称移动;对狭窄河谷,最大加速度在坝轴线中间坝顶部位,对宽阔河谷,最大加速度在靠近两岸的部位.对面板堆石坝地震反应加速度分布规律进行了统计分析,给出了计算坝体最大加速度放大倍数的经验公式,为实际工程中进行基于拟静力法的面板堆石坝抗震稳定分析提供了参考依据.

On the condition of different dam heights and different shapes of river valley,3-D dynamical responses of concrete-faced rockfill dams subjected to different seismic intensity input are analyzed based on equivalent-linear model in this paper.The results present that on the condition of the same dam height and the base acceleration excitations unchanged,with the increase of the river valley width,the position of the maximum acceleration on the axis of the top moves from the middle to the riversides symmetrically.To the narrow river valley,the position of the maximum acceleration which occurs near the riversides to the wide valley is on the middle of the axis at the top.Statistical analysis is also made to the seismic coefficient,and an empirical equation for calculating the maximum acceleration of the dam is provided,which provide an reference for the seismic stability analysis of rockfill dams using pseudo-static method.