混凝土面板堆石坝应力变形长期性状有限元模拟

为了获得混凝土面板堆石坝长期力学行为（尤其流变变形对混凝土面板堆石坝工作性状的影响）定量分析成果，运用ABAQUS有限元对国内某抽水蓄能电站混凝土面板堆石坝进行了数值模拟。采用考虑非线性强度的改进双屈服面流变模型描述堆石料长期力学性能，其中瞬时塑性变形采用改进双屈服面模型确定，而黏塑性流变变形采用指数衰减函数定义。有限元分析获得坝体、单元和面板在填筑期、蓄水期与运行期的应力与变形一般规律。结果表明：运行阶段堆石流变变形对混凝土面板堆石坝应力、变形性状产生显著影响。研究结论有益于进一步了解和合理预测混凝土面板的长期性能。

Finite element analysis of long-term stress-deformation behavior for concrete-faced rockfill dam

The aim of this paper is to obtain quantitative information of the long-term mechanical behavior of a concrete-faced rockfill dam (CFRD), particularly the effect of rheological deformation on the performance of CFRD. Some numerical simulations have been conducted for a CFRD of a Pumped Storage Power Station in China by ABAQUS finite element code. A modified double-yield surface rheological model incorporating nonlinear strength is applied to describe the long-term mechanical behaviors of the rockfills. The instantaneous plastic deformations of rockfills are determined by the modified double-yield surface model; and the time dependent viscoplastic deformations of rockfills are defined by the empirical equations of exponent function. The predicted results of finite element analysis (FEA) present the evolution of the stress and deformation of dam body, dam element and face slab at the construction, impounding and operational stages. From the results of FEA, it has been shown that the rheological deformation of rockfills at the operational stage has a remarkable effect on the stress and deformation of CFRD. The results or conclusions in this paper are beneficial to further knowledge, reasonable prediction and optimizing design of the long-term mechanical behavior for CFRD.