高混凝土面板堆石坝流变的三维有限元数值模拟

采用一种新的能模拟高围压条件的堆石料幂函数流变本构模型，对水布垭面板堆石坝进行了考虑堆石料流变特性的应力-应变仿真分析。结果表明，考虑堆石料流变特性后的坝体变形有明显的增加，坝体应力有所松弛。堆石体的流变特性使得面板的挠度有所增加，面板顺坡向和坝轴向拉应力极值有所增大。对于分期浇筑面板、分期蓄水的高混凝土面板堆石坝，选用合适的流变本构模型正确地模拟堆石体的流变特性，其结果可以为大坝填筑进度及面板分期浇筑时间的确定提供参考，对于正确地预测大坝的应力变形也具有重要意义。

Three dimension FEM numerical simulating of the rockfill creep of high concrete face rockfill dam

Based on a new kind of rockfill power function creep constitutive model which can simulate high confining pressure state of rockfill,the stress and deformation simulation analysis with consideration of rockfill creep are performed for Shuibuya concrete face rockfill dam(CFRD).The computation results show that the deformation of dam shows evident increment and stress of dam relax a little.The creep of the rockfill result to some increase of the normal direction deformation and stress of the concrete face.The reasonable creep model is adopted to simulate deformation of rockfill correctly,the results of which can offer some references for the construction process and the decision of the constructing time.It has also very important significance for that the stress and deformation of CFRD can be forecasted according to simulation analysis results.