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建立了高面板堆石坝非线性变形与非稳定渗流的水力耦合模型。该模型分别采用邓肯E-B模型和抛物Signroini型变分不等方法模拟堆石体的非线性应力变形过程和非稳定渗流过程,并通过修正的Kozeny-Carman模型表征堆石体的渗透特性对变形和围压的依赖关系。在面板渗透系数反演分析的基础上,应用上述模型对水布垭面板堆石坝进行了渗流–变形耦合分析。通过对数值模拟结果与实测数据的对比分析,表明因面板的绝对防渗作用,堆石体中的水力耦合效应并不显著,且上述模型可在一定程度上揭示堆石坝的渗流及变形发展趋势;但因忽略了流变、湿化、室内试验参数的尺寸效应以及非饱和渗流等,上述模型也存在较为突出的局限性。研究成果对于高面板堆石坝的水力耦合分析具有一定指导意义。
The hydraulic coupling model of nonlinear deformation and unsteady seepage of high concrete faced rockfill dam is established. This model simulates the nonlinear stress deformation process and the unsteady seepage process of the rockfill body by means of the Duncan EB model and the Parabolic Signroini variational inequality method respectively. The modified Kozeny-Carman model characterizes the influence of the permeability characteristics of the rockfill body on the deformation and Dependence of confining pressure. Based on the inversion of the panel permeability coefficient, the above model is applied to analyze the seepage - deformation coupling of the Shuibuya Concrete Faced Rockfill Dam. By comparing the numerical simulation results with the measured data, it is shown that the hydraulic coupling effect of the rockfill body is insignificant due to the impervious effect of the panel, and the above model can reveal the seepage and deformation of the rockfill dam to a certain extent However, due to neglect of rheology, wetting, size effect of indoor test parameters and unsaturated seepage, the above model also has some outstanding limitations. The research results have certain guiding significance for the hydraulic coupling analysis of high concrete faced rockfill dam.