【摘要】 在5·12汶川地震后的四川省水库土坝震害调查成果的基础上,选取汶川地震中受损的有完整资料的96座水库土坝为研究对象,应用等效线性模型对土坝进行了二维动力反应分析。选择3条有代表性的汶川地震实测记录,以三水准峰值加速度输入,得到土坝的动力反应(放大系数、最大动剪应力)与土坝几何形状(宽高比、上游坡比、坝高)间的经验关系。结果表明,土坝放大系数和最大动剪应力随着宽高比和上游坡比的增大而减小,随着坝高的增大而增大;输入波的频谱和峰值强度均对土坝动力反应与其几何形状的经验关系有重要影响。更多还原

【Abstract】 The technical investigation of earthquake-induced reservoir earth dam damages in Sichuan Province was carried out after M 8.0 Whenchuan earthquake happening on May 12,2008.Ninety six damaged reservoir earth dams with complete information were selected as the subjects investigated.The simple 2D nonlinear dynamic analyses of 96 earth dams were conducted.The equivalent linear model was used to simulate the dynamic nonlinearity of the dam soils.Three representative Wenchuan earthquake records with three levels peak acceleration were taken as the input waves.The dynamic responses including the acceleration amplification factor and the maximum dynamic shear stress of 96 earth dams were analyzed,and the empirical relationships between dynamic response of earth dams and their geometries were discussed. The results show that the acceleration amplification factor and the maximum dynamic shear stress decrease with increase of aspect ratio and upstream slope ratio.With increase of the dam height,the dynamic responses increase.Additionally,the relationships between dynamic response of earth dams and their geometries are related to the characteristics of the input earthquake motion.更多还原