水布垭混凝土面板堆石坝地震永久变形分析

Analysis of Earthquake Induced Permanent Deformation for High Concrete Face Rockfill Dams

以水布垭混凝土面板堆石坝为研究对象 ,采用考虑残余体积应变与残余剪应变的计算模型进行整体永久变形分析 ,得出了动力变形量及其分布特征 ,以及永久变形对高面板堆石坝防渗系统的影响 .结果表明 ,在地震作用下高坝上部面板与垫层间的动位移存在相位差 ,使面板动应力在上部产生明显的变化 ,需要给予重视 ;高混凝土面板堆石坝在 0 .1g峰值加速度地震作用下产生的永久变形 ,对于 30 0m级高的混凝土堆石坝结构的影响不显著 .

With the Shuibuya Concrete Face Rockfill Dam as an example, earthquake induced permanent deformation of high concrete face rockfill dams is studied. The results show that the phase difference between dynamic displacements of the upper face slab and the cushion of the high dam leads to a great change in the stress in the upper face slab, thus, the phase difference should be considered carefully. Compared with the impact on low concrete face rockfill dams, the impact of permanent deformation caused by earthquake of 0.1g acceleration on the structure of high dams is not significant.