【摘要】 通过深覆盖层上高堆石坝振动台试验与动力数值分析相互验证研究 ,表明考虑坝体地基相互作用的数学、力学模型是合理、正确的 .数值计算能非常方便地调整各种物理力学参数 ,从而又能指导模型试验 .通过振动台试验与数值分析相互验证的成果 ,针对深覆盖层上高堆石坝的动力特性得出系统自振频率随地震历时的变化规律 ,加速度放大系数与地震量级大小的关系 ,以及对《水工建筑物抗震设计规范》中仅要求进行两向地震输入和针对不同的地震烈度采用相同的加速度分布系数提出建议 .更多还原

【Abstract】 By means of combined shaking table test and dynamic numerical analysis of high rockfill dams constructed on deep overburden the mathematical and mechanical models,which are developed and employed in the present paper,reasonable for convenience of modification of various physical parameters,the numerical method is in turn used to direct the execution of model test.Through combined study,some useful conclusions are reached concerning high dams constructed on deep overburdens,such as the variation law of natural frequency with the time history of an earthquake,and the relationship between the acceleration amplification coefficient and the magnitude of an earthquake.Finally,some suggestions are proposed about two dimentional seismic excitation and employment of the same acceleration distribution coefficient for different seismic intensities,which are stipulated in the Anti seismic Norms for Hydraulic Structures.更多还原