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Three-dimensional models of reservoir sediment and effects on the seismic response of arch dams

机译：储层泥沙三维模型及其对拱坝地震反应的影响

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摘要

The important effects of bottom sediments on the seismic response of arch dams are studied in this paper. To do so, a three-dimensional boundary element model is used. It includes the water reservoir as a compressible fluid, the dam and unbounded foundation rock as viscoelastic solids, and the bottom sediment as a two-phase poroelastic domain with dynamic behaviour described by Biot's equations. Dynamic interaction among all those regions, local topography and travelling wave effects are taken into account. The results obtained show the important influence of sediment compressibility and permeability on the seismic response. The former is associated with a general change of the system response whereas the permeability has a significant influence on damping at resonance peaks. The analysis is carried out in the frequency domain considering time harmonic excitation due to P and S plane waves. The time-domain results obtained by using the Fourier transform for a given earthquake accelerogram are also shown. The possibility of using simplified models to represent the bottom sediment effects is discussed in the paper. Two alternative models for porous sediment are tested. Simplified models are shown to be able to reproduce the effects of porous sediments except for very high permeability values.
机译：研究了底部沉积物对拱坝地震反应的重要影响。为此，使用了三维边界元素模型。它包括以可压缩流体形式存在的水库，以粘弹性固体形式存在的大坝和无界基础岩石，以及具有Biot方程描述的动态行为的两相多孔弹性域的底部沉积物。考虑了所有这些区域之间的动态相互作用，局部地形和行波效应。所得结果表明，沉积物的可压缩性和渗透性对地震响应具有重要影响。前者与系统响应的总体变化有关，而磁导率对共振峰处的阻尼有重要影响。考虑到由P和S平面波引起的时间谐波激励，在频域中进行了分析。还显示了通过使用给定地震加速度图的傅里叶变换获得的时域结果。本文讨论了使用简化模型来表示底部沉积物影响的可能性。测试了多孔沉积物的两种替代模型。除极高的渗透率值外，简化的模型显示出能够再现多孔沉积物的作用。

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