库底淤沙对混凝土重力坝地震响应的影响
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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.
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.
引文
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[2]Fenves G,Chopra A K.Effects of reservoir bottom absorption and dam-water-foundation rock interaction on frequency response functions forconcrete gravity dams[J].Earthquake Engineering and Structural Dynamics,1985,13(1):13~31.
[3]Bougacha S,Tassoulas J L.Effects of sedimentary material on the response of concrete gravity dams[J].Earthquake Engineering&Structuredynamics,1994,20:849~858.
[4]Bougacha S,Tassoulas J L.Seismic response of gravity dams(Ⅰ):Modeling of sediments[J].Journal of Engineering Mechanics,ASCE,1991,117(8):1826~1837.
[5]Bougacha S,Tassoulas J L.Seismic response of gravity dams(Ⅱ):Effects of sediments[J].Journal of Engineering Mechanics,ASCE,1991,117(8):1839~1850.
[6]Du Xiuli,Wang Jinting,Huang T K.Effects of sediment on the dynamic pressure of water and sediment on dams[J].Chinese ScienceBulletin,2001,46(6):521~524.
[7]王进廷.高混凝土坝-可压缩库水-淤沙-地基系统地震反应分析研究[D].北京:中国水利水电科学研究院,2001.WANG Jinting.Research on seismic response of high concrete dam-compressible water-sediment system[D].Beijing:China Institute ofWater Resources and Hydropower Research,2001.(in Chinese)
[8]杜修力,王进廷,张楚汉.淤积泥砂对垂直地运动作用时刚性坝面动压力的影响研究[J].水利学报,2003,(2):8~13.DU Xiuli,WANG Jinting,ZHANG Chuhan.The effects of sediment on dynamic pressure acting on rigid dam during vertical ground motion[J].Joumal of Hydraulic Engineering,2003,(2):8~13.(in Chinese)
[9]王进廷,杜修力,张楚汉.重力坝-库水-淤沙-地基系统动力分析的时域显式有限元模型[J].清华大学学报(自然科学版),2003,43(8):1112~1115.WANG Jinting,DU Xiuli,ZHANG Chuhan.Explicit finite element model for dynamic analysis of dam-reservoir-sediment-foundation system[J].Journal of Tsinghua University:Science and Technology,2003,43(8):1112~1115.(in Chinese)
[10]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55~64.LIU Jingbo,LU Yandong.A direct method for analysis of dynamic soil-structure interaction[J].China Civil Engineering Journal,1998,31(3):55~64.(in Chinese)
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