不同河谷条件面板堆石坝地震加速度反应规律  

Research on Distribution of Horizontal Acceleration of Concrete Faced Rockfill Dam Under Different Conditions of River Valley

作　　者：宋志宇[1] 董莉莉[1] 李斌[1] 

机构地区：[1]黄河勘测规划设计有限公司,河南郑州450003

出　　处：《人民黄河》2014年第7期103-105,共3页Yellow River

摘　　要：采用等价线性化黏-弹性模型研究了不同坝高、不同河谷宽度和不同河岸坡度情况下的面板堆石坝地震响应,进行了三维动力反应计算分析,重点分析了面板堆石坝坝顶点的地震动力加速度反应随河谷形状变化的规律。结果表明:中高坝坝体的最大加速度反应值位于河谷中央的坝顶,且最大加速度反应值随河谷的变窄而变大;高坝坝体的加速度反应规律及加速度最大反应值受河谷形状的影响较小;低坝河谷较宽时,坝体的最大加速度反应值由河谷中央向两岸移动,因此对宽河谷采用二维计算时,既不能给出坝体的最大加速度反应值,也不能给出最大加速度位置,必须采用三维计算。In order to find the distribution patterns of dynamic acceleration for dams subjected to earthquake,3D seismic responses of concrete-faced rockfill dams with different heights,different widths of river valley and different bank slopes were analyzed by using equivalent-linear model. The acceleration distribution along the dam axis at the top of the dam was mainly analyzed. The results show that if dam height is about 200 m,the position of the maximum acceleration is on the middle of river valley at the top;if dam height is higher（about 300 m）,the position and distribution of the maximum acceleration is generally not affected by the conditions of river valley;To lower dam（100 m）and wider valleys（ ﹥ 50 m）,the po-sition of the maximum acceleration on the axis of the top moves from the middle valley to the riversides. So if 2-D dynamical computation for wide valleys is used to compute the seismic response. It concludes that the maximum acceleration value and its occurring position cannot be correctly got. So it should take 3-D dynamical computation for concrete-faced rockfill dams.

关 键 词：面板堆石坝 动力分析 河谷条件 加速度分布 

分 类 号：TV641.4[水利工程—水利水电工程]