水库淤沙对拱坝地震响应的影响研究
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摘要
基于液固两相介质的Biot固结理论,应用饱和多孔液固两相介质的波动方程,研究淤沙对拱坝的地震响应大小。把淤沙模拟成塑性材料,分析淤沙层厚度、凝聚力和摩擦角对拱坝地震响应的影响程度。通过算例分析表明,淤沙对拱坝坝体地震响应的影响较为显著。
By Bait's consolidation theory,pressure wave equation of saturated porous fluid-solid medium was applied to prediction of the seismic response magnitude of arch dam.Thickness,cohesion and friction angle of the sediments were considered to analyze their effects on the response.Application of the method to a typical example shows a significant effect of sediments.
By Bait's consolidation theory,pressure wave equation of saturated porous fluid-solid medium was applied to prediction of the seismic response magnitude of arch dam.Thickness,cohesion and friction angle of the sediments were considered to analyze their effects on the response.Application of the method to a typical example shows a significant effect of sediments.
引文
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[2]Cheng A H D.Effect of sediment on earthquake-induced reservoir hydrodynamic response[J].Journal of Engineering Mechanics,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]ZHANG Chuhan,YAN Chengda,WANG Guanglun.Numerical simulation of reservoir sediment and effects on hydrodynamic response of arch dams[J].Earthquake Engineering and Structure Dynamics,2001,30:1817～1837.
[5]Mehmet Akkose,Erman Simsek.Non-linear seismic response of concrete gravity dams to near-fault ground motions including dam-water-sediment-foundation interaction[J].Applied Mathematical Modelling,2010,34:3685～3700.
[6]杜修力,赵密.基于黏弹性边界的拱坝地震反应分析方法[J].水利学报,2006,37(9):1063～1069.DU Xiuli,ZHAO Mi.Analysis method for seismic response of arch dams in time domain based on viscous-spring artificial boundary condition[J].Journal of Hydrodynamic Engineering,2006,37(9):1063～1069.(in Chinese)
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