结构分区对高面板堆石坝变形特性的影响

Effect on Deformation Characteristics of Structural Subzone to High Concrete Face Rockfill Dam

中国面板堆石坝的实践经验认为,主次堆石分界线位置倾向下游,有利于高面板堆石坝的变形控制。美国的Palmi提出了主次堆石分界线的位置倾向上游,并适当降低次堆石区的顶部高程,次堆石区顶部位置向下游方向移动的分区理念。为此通过有限元仿真计算,对比两种分区形式对高面板堆石坝应力变形性状的影响。结果表明,这种新型分区理念有利于减小面板的脱空和结构应力,在理论上是是可行的,值得在实践中推广。

The specialists in China believe that the separation line of main and hypo-rockfill zone inclining to downstream is beneficial to the deformation control of high CFRD, while Palmi suggests a new concept for subzoning, in which the separation line inclines to upstream, the height of hypo-rockfill zone is reduced and the top position of the hypo-rockfill zone moves to the downstream. The effects of two subzoning methods on the stress and deformation of CFRD are studied by FEM and the results show that the new concept is beneficial to reduce the slab void and structural stress and is feasible in theory.