【摘要】 介绍世界上最高的心墙堆石坝——双江口大坝的振动台模型试验,并利用等效线性方法对模型坝进行三维动力有限元分析,得到坝体加速度放大倍数沿坝高、坝轴线和顺河向的分布规律,并验证了利用等效线性方法进行堆石坝的动力分析是基本可行的。但是有限元难以准确模拟下游松散边坡的表面放大效应,可能导致计算结果偏小,且地震动输入较大时,等效线性方法计算结果误差较大。根据原型坝的数值分析可知,原型坝加速度反应的总体规律计算值与试验值大致相同,利用模型试验相似率推算的原型坝自振频率也与计算值相差不大。说明利用振动台模型试验研究高堆石坝的动力特性和动力反应有重要参考价值。更多还原

【Abstract】 This paper presents a shaking table test and model dam analysis by equivalent linear method for the highest core rock-fill dam in the world,the Shuangjiangkou dam,including vertical profiles of acceleration amplification factor and its variations along dam axis and in stream direction.The results show that the equivalent linear method is applicable to dynamic analysis of rock-fill dam,but its calculation error is quite obvious,because computed values smaller than the tested values could occur if FEM meets difficulties in accurate simulation of large deformation on incompact slope.This error becomes greater for stronger seismic inputs.The natural frequency of prototype dam estimated by similarity theory is close to the calculations.This work demonstrates that shaking table test provides important reference to study of dynamic characteristics of high rock-fill dam.更多还原