中文摘要：

以碾压混凝土重力坝为对象,开展了水平地震动作用下库底淤沙层对大坝动力响应影响的研究。将坝体碾压混凝土和基岩材料模拟为Drucker-Prager弹塑性材料,考虑碾压混凝土大坝层面和坝体-基岩交界面处的不连续非线性行为,采用相关流动法则和Lagrangian流体单元,考虑弹性地基,库水以及水库底部沉积物等不同材料介质间的相互作用,对有无沉积物和不同沉积物高度情形的碾压混凝土大坝进行了动力反应分析。分析结果表明,地震作用下库底淤沙层对碾压混凝土重力坝动力特性有着一定的影响,地震动作用下碾压混凝土大坝的弹塑性分析应适当考虑淤积层的影响。

英文摘要：

The sediments at the bottom of reservoirs have a great impact on the seismic response of the concrete dam above. Due to this, the effects of the sediments on nonlinear dynamic response of roller compacted concrete （RCC） dams were investigated. The nonlinear behavior of the dam concrete and rock was idealized as elasto-plastic using the Drucker - Prager model based on the associated flow rule assumption. Special emphasis was given to the non-linear behaviour of discontinuities along RCC interfaces and dam-bedding rock foundation. The interactions between flexible foundations, reservoir water, and bottom reservoir sediments were represented by related flow rule and Lagrangian fluid units. The re- suits obtained from nonlinear analyses for different sediments levels were compared with each other. It is apparent that the sediments effects must be considered in the elasto-plastic analyses of RCC dams under earthquake ground motion.