流变效应对高混凝土面板堆石坝应力变形的影响

采用三维非线性有限单元法对牛牛混凝土面板堆石坝施工期和蓄水期的应力变形进行模拟计算，并结合沈珠江提出的指数型曲线流变模型，采用自行编制的有限元程序对大坝进行了三维流变分析，得到了坝体、面板在各个时期的应力和变形情况，以及堆石流变对坝体应力变形的影响；计算面板和周边缝位移时采用了三维子模型法，根据实际的坝体填筑、蓄水过程，对每一期面板浇筑之前的坝体上游面位移进行修正，并通过在面板与堆石体之间设置三维面-面摩擦接触单元，来有效模拟面板的应力、变形，为该坝的进一步优化设计提供了有益的建议。

Effects of rockfill rheology on deformation and stress of high concrete faced rockfill dam

A 3D nonlinear FEM is used to simulate the strain and stress of Niuniu concrete faced rockfill dam during construction and impounding time; and unified the index curve which academician Shen Zhujiang proposed to analyze the rheology of dam based on the FEM program written by our group. So in each time the stress and strain of dam body can be obtained and the influence of rheology on dam stress and strain. while calculate the displacement of faceplate slot and peripheral slot, 3D Submodel method is used. Base on actual construction and impounding process, amend the displacement of dam upriver surface before each stage faceplate being built. face-to-face fiction contact element between concrete face and dam body to simulate the strain and stress of the faceplate. So some helpful suggestion can be provided for the further optimizing design of the dam.