关键词: 高心墙堆石坝, 三维反演分析, 广义塑性模型, 地震响应预测

Abstract: Reasonable and accurate description of the mechanical properties of rockfill is an important prerequisite for seismic response prediction and safety evaluation of the high earth rockfill dam, and in this paper, 3D inverse analysis is carried out using the deformation monitoring results of an extra-high rockfill dam during the filling period.The generalized plastic model and Duncan E-B model parameters of dam material are obtained, which can reflect the real state of the dam.In addition, the accuracy of two constitutive models is discussed.And the seismic response prediction and safety evaluation of high earth rockfill dams are performed using the inversed generalized plastic model parameters.Compared with the measured results, the vertical and horizontal displacements calculated by the generalized plastic model coincide well, and the inversed parameters can be applied to predict the dynamic response of dams directly.However, the conventional Duncan E-B model cannot take into account both vertical and horizontal deformation, and the inversed parameters cannot be used for dynamic analysis.The vertical and horizontal displacements calculated by the proposed static-dynamic unified generalized plastic model are in agreement with measured data, demonstrating that it can be applied in seismic prediction.The results show that the proposed analytical methods for seismic response prediction based on the elasto-plastic inverse analysis can provide a reliable technical support for safety evaluation and risk warning of high earth rockfill dams.

Key words: high core wall rockfill dam, 3D inverse analysis, generalized plastic model, seismic response prediction;