【摘要】 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。更多还原

【Abstract】 Based on collection of many dynamic test results of domestic earth-rockfill dam materials,mean and 2σ-standard deviation curve of dynamic equivalent shear modulus and dynamic damping ratio versus shear strain are given for rockfill materials,core wall,dam foundation sands and filter materials.Taking 200m typical high core dam for an example,sensitivity of dam dynamic earthquake response is analyzed by using 2D-FEM.The results show that the case of +2σ-standard deviation curve of equivalent shear modulus and-2σ-standard deviation curve of dynamic damping ratio leads to the maximum dynamic earthquake response of the dam,and it is aseismic control scheme of earth-rockfill dam.更多还原