基于粒子群算法的鲤鱼潭大坝坝料动参数反演

摘要

土石料的动力模型参数是影响土石坝抗震安全分析的主要因素。土石坝动力模型参数一般是通过室内试验确定的，但受施工工艺、施工方法和施工质量的影响，其结果与坝体实际参数会存在差异。为此，提出了一种以加速度反应谱为目标函数的土石料参数反演方法，该方法依据坝体在地震中的响应信息，利用粒子群算法反演坝体的材料参数。结果表明，动剪模量衰减曲线和阻尼比增长曲线对坝体地震响应有很大影响。%Dynamic model parameters of earth and rock material are the main factors affecting anti-seismic safety analysis of earth-rock dams. Differences between the parameters determined by laboratory test and the actual parameters are more or less inevitable due to the influence of construction techniques, methods and quality. To solve the problem, we put forward a dynamic model parameter inversion method that takes the acceleration response spectrum as object function, in which the dynamic parame-ters of embankment material are inverted by particle swarm algorithm according to the response information of dams in earth-quake. The results show that the attenuation curve of dynamic shear module and the cumulative curve of damping ratio have sig-nificant influence on seismic response of dam.