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The application of nonlinear dilatancy model in stress and deformation analysis of high concrete faced rockfill dam

机译：非线性剪胀模型在高面板堆石坝应力变形分析中的应用

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The concrete-faced rockfill dam (CFRD) is a widely applied geotechnical structure. The stress and deformation conditions of CFRD are absolutely critical for the safety of dam. However, only a few constitutive models have been reported to appropriately simulate and predict the specific stress and deformation of high CFRDs. In this paper, a new nonlinear dilatancy constitutive model was introduced to analyze CFRDs. Based on the generalized potential theory, the stress-strain matrix [Dpq] for the nonlinear dilatancy mode was also demonstrated. The numerical simulation result by the nonlinear dilatancy model was compared with that by a large-scale tri-axial compression test. It is concluded that the behaviours of rockfill materials can be well simulated by the nonlinear dilatancy model. In addition, the nonlinear dilatancy model was applied to simulate the step-by-step construction and impounding of the reservoir process in the Chinese Shuibuya CFRD. From comparative studies of the numerical results and in-situ monitoring data, a good agreement can be explored between the measured and computed settlements. This result also indicates that a 3D finite element analysis based on the nonlinear dilatancy model can be applied to predict the stress and deformation of CFRDs.
机译：混凝土面板堆石坝（CFRD）是一种广泛应用的岩土结构。 CFRD的应力和变形条件对于大坝的安全至关重要。但是，仅报道了一些本构模型来适当地模拟和预测高CFRD的比应力和变形。本文介绍了一种新的非线性膨胀本构模型来分析CFRD。基于广义势理论，还证明了非线性扩张模式的应力应变矩阵[Dpq]。将非线性膨胀模型的数值模拟结果与大规模三轴压缩试验的数值模拟结果进行了比较。结论是，非线性膨胀模型可以很好地模拟堆石料的行为。此外，非线性膨胀模型被应用来模拟中国水布CFCFRD的储层过程的逐步构造和蓄积。通过对数值结果和现场监测数据的比较研究，可以在实测沉降值和计算沉降值之间找到良好的一致性。该结果还表明，基于非线性剪胀模型的3D有限元分析可用于预测CFRD的应力和变形。

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