堆石料流变参数对面板堆石坝变形敏感性分析研究

Sensitivity Analysis of Rockfill Rheological Model Parameters to Deformation of Concrete Faced Rockfill Dams

堆石料七参数流变模型是沈珠江三参数流变模型改进模式,能够同时反映剪应力、围压与应力水平对堆石料变形的影响,目前已成为混凝土面板堆石坝流变分析最常用的模型之一。采用正交试验法,以某混凝土面板堆石坝为例,进行七参数流变模型参数对于坝体最大竖向位移和面板最大挠度影响的敏感性分析。研究结果表明:七参数流变模型中参数α、m2以及d对坝体最大竖向位移和面板最大挠度的敏感性相对较大;而其他参数,如b、c、m1和m3对坝体最大竖向位移和面板最大挠度的敏感性相对较小。研究成果可以为面板堆石坝七参数流变模型参数的选取提供参考。

As the improvement of the Shenzhujiang River three-parameter rockfill rheological models, the seven-parameter rockfill rheological model can simultaneously reflect the effects of shear stress, confining pressure and stress level on the deformation of rockfill. Therefore, it has become one of the most commonly used models in the rheological analysis of concrete faced rockfill dams. Based on the orthogonal test method, an example of concrete faced rockfill dam is given in this paper to conduct a survey of the sensi- tivity analysis of the seven parameters concerning the maximum vertical displacement of dams and the maximum deflection of the pan- el. The results show that among the seven-parameter rockfill rheological model parameters, the sensitivity of a, m2 and d are rela- tively large on the maximum vertical displacement of dams and the maximum deflection of the panel. However, the other four param- eters of b, c, el and rn3 have relatively small influence on the maximum vertical displacement of dams and the maximum deflection of the panel. The results of this paper can provide a reference for selecting the proper parameters when seven-parameter rockill rheo- logical model of concrete faced roekfill dam is employed.