高土石坝地震安全评价及抗震设计思考

Thoughts on safety assessment and earthquake-resistance for high earth-rock dams

摘要: 介绍了国内外几座典型土石坝的震害表现,并对这些土石坝,特别是紫坪铺混凝土面板堆石坝的震害原因进行了详细分析.结果表明,地震导致的坝体附加变形以及坝体不同部位变形的不均匀和不协调是土石坝发生震害的主要原因,土石坝的各类不同材料的接触带以及河谷地形突变处是发生震害的主要部位,在大坝设计施工时需特别予以关注.最后,对高土石坝安全评价和抗震设计方法提出了若干建议,并特别指出,考虑到地震的随机性和高土石坝安全的绝对重要性,有必要研究高土石坝的极限抗震能力.

Abstract: The earthquake performances of some typical earth-rock dams are introduced in this paper,and the reasons of earthquake damage of these earth-rock dams,particularly the Zipingpu concrete faced rockfill dams are analyzed in detail.It is found that the additional permanent deformation due to earthquake,the non-uniformity and incompatibility of permanent deformation are the main reasons of dam damage.The dam damages due to earthquake mainly occur in such areas as the interfaces of different materials of earth-r...