梅溪覆盖层上混凝土面板堆石坝流变变形反馈分析及安全性研究

Back analysis of creep deformation and study on safety of Meixi CFRD built on riverbed alluvium

在整理分析覆盖层上面板堆石坝变形观测资料的基础上,对坝体堆石料模型计算参数及流变模型参数进行反馈分析。根据反馈分析得到的计算结果,采用双屈服面弹塑性模型,用三维有限元法分析研究坝体、坝基、混凝土面板、防渗墙和趾板应力及变形的分布规律,得出了有价值的计算分析结果,论证了该坝运行期间的安全性。通过对该坝的流变计算,得出坝体、坝基流变变形较小,而且基本趋于稳定的结论。

Based on the collected creep deformation data of CFRD built on riverbed alluvium, the back analysis for calculation parameters and creep deformation parameters of dam materials was performed. According to the results calculated by the back analysis, the distribution of stress and strain in the dam body, foundation, concrete face slabs, concrete diaphragms wall and toe slabs was studied by the double yield surface elasto-plastic model and three-dimensional FEM. Some valuable results were obtained. It was shown that the creep deformation of the dam body and foundation was on a small level and tended to be stable.