深覆盖层上混凝土面板堆石坝地震反应分析

Seismic Response of CFRD on Alluvial Deposit

利用三维非线性有限元动力分析法研究了地震区深厚覆盖层地基上高混凝土面板堆石坝的地震反应．分析中考虑堆石的动力非线性及地震时坝体动水压力作用，提出了深厚覆盖层地基中细砂透镜体的液化分析方法．结论认为：位于８度烈度地震区深厚覆盖层地基上的混凝土面板堆石坝，趾板建于地基混凝土防渗墙顶部，地震反应在容许范围内；深厚覆盖层地基中的细砂透镜体在较高围压作用下不会液化．地震区深厚覆盖层混凝土防渗墙上的高面板堆石坝在技术上是可行的．

In this paper, the seismic response of CFRD on alluvial deposit in epicentral area is analyzed by 3 D nonlinear FEM. The nonlinear dynamic properties of rockfill materials and the interaction of water and dam are considered, and a discriminating method of sand liquification is presented. The conclusion is that the seismic response of CFRD on a thick overburden, whose plinth is built on the top of concrete diaphragm, is safe in 8 degree earthquake areas. No liquification will take placc when there is high pressure around the intercalated bed of the saturated lens object in the thick overburden.