【摘要】 为了研究淤砂层对高坝地震反应的影响,建立了重力坝库水淤砂地基系统动力分析的二维时域显式有限元模型,其中将淤砂层模拟为液固两相介质,并严格考虑了坝体、库水、淤砂层和地基间的动力相互作用。该模型的特点在于不同类型介质都以位移向量为未知量,采用时域显式逐步积分方式求解,不需要求解联立方程,因此节省计算时间和内存,可以非常方便地用于坝体线性和非线性动力反应分析。文中还应用所建立的模型,分析了淤砂层饱和度及厚度对坝顶加速度反应的影响,结果表明淤砂层可能会对坝体反应产生重要影响。更多还原

【Abstract】 The effect of sediment on the dynamic response of dams was investigated using a twodimensional explicit finite element model for dynamic analysis of the damreservoirsediment foundation system. The sediment is modeled as an elastic porous medium. The dynamic interactions among the dam, water, sediment and foundation were analyzed by solving the dynamics equations explicitly. Since the equations are not solved simultaneously, the model significantly reduces the computation effort and memory requirement. The procedure can also be applied to nonlinear dynamic response analysis of damreservoir systems. The procedure was used to analyze the effects of sediment saturation and thickness on the movement of the dam. The results show that the sediment may significantly affect the dynamic response of the dam when the sediment is partially saturated.更多还原