胶凝面板堆石坝离心模型试验研究

为了解胶凝面板堆石坝在竣工期和蓄水期的工作性态,采用离心模型试验方法对不同胶凝含量下坝体的应力变形进行试验研究,同时与非线形有限元法数值模拟计算进行对比分析.结果表明:随着坝体材料中胶凝含量的增加,坝体沉降和面板挠度在竣工期和蓄水期明显减小,改善了面板的受力条件,可保证防渗体系的正常工作;胶凝含量的增加,提高了坝体的抗剪强度和承载力,设计时坝坡可明显放陡,坝体断面显著缩小,大大节省了筑坝堆石料,并能保证大坝在应力变形和稳定性方面的安全可靠性;离心试验得到的竣工期和蓄水期的坝体应力、位移,面板法向位移与数值计算结果规律基本一致,可为胶凝面板堆石坝的设计提供参考.

Research on centrifugal model experiment for concrete-faced cemented-rockfill dam

In order to understand the work behavior of a concrete-faced cementedrockfill dam in completion and water storage periods,the stress and deformation of the dam with different contents of cement were studied using a centrifugal model experiment,and the experimental results were compared with those of the nonlinear finite element method.The results show that the dam settlement and slab deflection in the completion and water storage periods obviously decrease with the increase of cement content,so the stress conditions of the concrete face ensuring that the impervious system works smoothly are improved.The shear strength and bearing capacity of the dam increase with cement content,so the dam slope can be designed to be steeper,reducing the size of the dam section and economizing the building materials.The stress and displacement of the dam and the normal displacement of the concrete face in the completion and water storage periods obtained by the centrifugal model experiment are in good agreement with those of the numerical model.These results can provide a useful reference for designing concrete-faced cemented-rockfill dams.