水布垭超高混凝土面板堆石坝的长期变形特性  

Long-term deformation properties of the highest Shuibuya concrete faced rock-fill dam

作　　者：汪明元[1,2] 黄斌[2] 陈琴[2] 潘家军[2] 

机构地区：[1]中国水电顾问集团华东勘测设计研究院,杭州310014 [2]长江科学院水利部岩土力学与工程重点实验室土工学科,武汉430010

出　　处：《水力发电学报》2010年第4期167-178,共12页Journal of Hydroelectric Engineering

基　　金：国家"十一五"科技支撑项目(2008BAB02);华南理工大学亚热带建筑科学国家重点实验室开放基金(2008KB26)

摘　　要：高应力下堆石料具有显著的流变特性,堆石料流变常对高面板堆石坝的安全运行造成影响。基于大坝完建期变形反分析所得的坝体填料参数,采用一种新的能模拟高压下堆石料流变特性的幂函数流变模型,对目前世界同类坝最高的水布垭面板堆石坝进行了三维流变分析,研究了蓄水后大坝的长期应力与变形特征。研究结果表明:考虑堆石料流变后,坝体变形有明显的增加;面板法向应力基本无变化,顺坡向拉应力范围及量值均减小,压应力增大,坝轴向拉应力和压应力均增加;面板法向位移(挠度)分布规律不变,量值增加,顺坡向位移等值线形态发生变化,坝轴向位移增加;面板竖缝和周边缝的变形均有所增大。A simulation analysis of stress and deformation of Shuibuya concrete face rockfill dam（CFRD） was conducted with consideration of rockfill creeping.This analysis is based on the parameters of filling materials determined by a back analysis and a new power function creep model for high confining pressure state of rockfill materials.Results show that deformation of the dam is increased significantly by the creep effects.A rheological analysis of the concrete face indicates an increase in the stress along the dam axis and a decrease in the slope-wise tension stress,while the normal stress and the distribution trend of normal displacement are unchanged.In addition,the slab deformation and the opening of vertical jonits and periphery joints show an increase,and the shape of contour of slope-wise slab displacement is also changed.

关 键 词：水工结构 长期变形 数值仿真 面板堆石坝 水布垭 

分 类 号：TV641.4[水利工程—水利水电工程]