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在对国内多座土石坝坝料的动力试验结果分析与整理的基础上,给出了堆石料、心墙料、坝基砂及反滤料的动剪切模量比和阻尼比与动剪应变关系的均值曲线和上下2倍均方差曲线,并以200 m典型心墙堆石坝为例,采用二维有限元法分析了坝体地震动力反应的敏感性。计算结果表明,坝料模量衰减曲线取上2倍均方差、阻尼比增长曲线取下2倍均方差时坝体的地震动力反应最大,为土石坝抗震的控制方案。
Based on the analysis and finishing of the dynamic test results of several earth-rock dam materials in China, the dynamic shear modulus ratio and damping ratio of the rockfill material, core wall material, dam foundation sand and filter media and dynamic shear strain The mean curve of the relationship and the mean square error curve of 2 times up and down. Taking the 200 m typical core rockfill dam as an example, the sensitivity of the dam to the earthquake dynamic response was analyzed by the two-dimensional finite element method. The calculation results show that the damping modulus of dam material takes 2 times mean square error, and the damped dynamic response of dam body is the largest when the damping ratio increase curve takes off 2 times mean square error, which is the control scheme of earth-rock dam.