库底饱和淤积砂层对高拱坝地震反应的影响研究
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摘要
本文中采用时域显式有限元方法,将库底淤积砂层模拟为重流体,以小湾拱坝为例,分析可压缩库水条件下库底饱和淤积砂层对高拱坝地震反应的影响。计算结果表明,从总体上来说饱和淤砂层的存在对高拱坝地震反应影响较小,但是仍有一些局部反应的变化值得注意。
Taking the Xiaowan arch dam as an example,the effects of saturated sediment on the seismic response of high arch dams are analyzed by using the time-domain explicit finite element model and modeling sediment media as the heavy fluid.The computation results show that,as a whole,the effects of the saturated sediment layer are ignorable.However,the presence of the sediment layer maybe causes some local changes which are worthy to be noticed.
Taking the Xiaowan arch dam as an example,the effects of saturated sediment on the seismic response of high arch dams are analyzed by using the time-domain explicit finite element model and modeling sediment media as the heavy fluid.The computation results show that,as a whole,the effects of the saturated sediment layer are ignorable.However,the presence of the sediment layer maybe causes some local changes which are worthy to be noticed.
引文
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[2]Cheng A H D.Effect of sediment on earthquake-induced reservoir hydrodynamic response[J].Journal of EngineeringMechanics,ASCE,1986,112(7):654~665.
[3]Dominguez J,Gallego R,Japon B R.Effects of porous sediments on seismic response of concrete gravity dams[J].Journal of Engineering Mechanics,ASCE,1997,123(4):302~311.
[4]Xiuli Du,Jinting Wang,Tinkan Hung.Effects of sediment on the dynamic pressure of water and sediment on dams[J].Chinese Science Bulletin,2001,46(6):521~524.
[5]王进廷,杜修力,张楚汉.重力坝-库水-淤砂-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,2003,43(8):1112~1115.
[6]Zhang Chuhan,Yan Chengda,Wang Guanglun.Numerical simulation of reservoir sediment and effects on hydro-dynamic response of arch dams[J].Earthquake Engineering and Structure Dynamics,2001,30:1817~1837.
[7]杜修力,王进廷.拱坝-可压缩库水-地基地震波动反应分析法[J].水利学报,2002,(6):83~90.
[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):66~72.
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