库底淤沙对混凝土重力坝地震响应的影响  

Effects of reservoir sediment on seismic response of concrete gravity dams

作　　者：牛志伟[1] 李同春[1] 赵兰浩[1] 

机构地区：[1]河海大学水利水电工程学院,南京210098

出　　处：《水力发电学报》2009年第5期187-190,162,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金委员会资助项目(90510017)

摘　　要：将库底淤沙层模拟为液固两相孔隙介质,用以固相位移和液相压力为基本未知量的u-p格式的Biot方程进行分析,建立了坝体-地基-库水-淤沙系统的动力反应分析模型。用该模型分析了地震荷载作用下库底淤沙层对重力坝动力特性的影响,结果表明淤沙层厚度增加会使坝面动水压力减小,使坝体加速度响应略有增大。A model for the dynamic response analysis of dam-foundation-water-sediment system is constructed in this paper. The Biot dynamic equations are solved for solid-phase displacement and fluid pressure by the u-p scheme, with reservoir sediment treated as a fluid-solid porous media. This model is applied to the analysis on the effects of reservoir sediment on seismic response of concrete gravity dams. The results show that the dynamic water pressure on the dam face is reduced and that the dam acceleration is slightly increased when sediment thickness increases.

关 键 词：水工结构 淤沙 动力分析 两相孔隙介质 重力坝 地基辐射阻尼 

分 类 号：TV312[水利工程—水工结构工程]