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基于七参数流变模型的堆石料流变分析已在面板堆石坝应力变形分析中得到广泛采用,但目前关于该流变模型参数对于坝体应力变形的敏感性研究还不够深入。为此,本文采用正交试验法,以公伯峡面板堆石坝为依托,以坝体最大沉降位移V、面板挠度δ和面板顺坡向应力σ作为敏感性分析的主要试验指标,进行七参数流变模型参数关于这些试验指标的敏感性分析。结果表明,对指标V、δ、σ来讲,因素m1的影响最大,其次是b和m2,这3个参数的敏感性作用显著;而α、c、d和m3对各指标的影响不够显著,参数敏感性低。因此,在采用七参数流变模型进行面板堆石坝流变分析时,应将m1、b和m2作为流变参数分析与选择的重点。本文研究成果可以为面板堆石坝流变分析时合理选择流变模型参数提供参考依据。
Rockfill rheological analysis based on the seven-parameter rheological model has been widely used in the analysis of stress and deformation of the rockfill dam. However, the research on the sensitivity of the rheological model parameters to the stress and deformation of the dam is not deep enough. Therefore, in this paper, orthogonal test method was used to rely on Gongboxia concrete face rockfill dam as the basis, the maximum settlement displacement of the dam V, the panel deflection δ and the slope of the panel along the slope σ as the main test sensitivity analysis, Parameter Rheological Model Parameter Sensitivity Analysis for these Experimental Indicators. The results showed that for the indexes V, δ, σ, the factors m1 had the greatest impact, followed by b and m2, and the sensitivity of these three parameters was significant; however, the effects of α, c, d and m3 on each index were not significant , Parameter sensitivity is low. Therefore, when using the seven-parameter rheological model to analyze the rheology of concrete face rockfill dam, m1, b and m2 should be taken as the focus of rheological parameter analysis and selection. The research results of this paper can provide references for the rational selection of rheological model parameters in the rheological analysis of concrete face rockfill dam.