西龙池下库沥青混凝土面板堆石坝的应力变形分析

Stress-deformation analysis of asphalt concrete faced rockfill dam

西龙池抽水蓄能电站下库大坝为沥青混凝土面板堆石坝 ,坝址地质地形条件复杂。本文采用沈珠江双屈服面模型和Burgers粘弹性模型分别模拟堆石材料和沥青混凝土材料的应力应变关系 ,对该坝进行二维及三维应力变形有限元分析。计算结果较合理地揭示该坝在施工和蓄水过程中的受力和变形性状。本文对面板计算参数进行了敏感性分析 ,重点研究覆盖层不均匀沉降对面板变形的影响 ,并对改善面板变形情况的工程措施进行了模拟计算和可行性分析。

In this paper,Stress-deformation analysis using FEM is performed for Xilongchi lower reservoir dam,an asphalt concrete faced rockfill dam.Shen-Zhujiang's double yielding-surface model and the Burgers model are used to describe the mechanical behavior of the rockfill and the asphalt concrete facing,respectively.Sensitivity analysis of the model's parameters of the facing is presented.The study of the facing is focused on its deflection induced by differential settlements of the dam body.In addition,engineering measures aiming to decrease the tensile strain of the ogee slab are simulated and evaluated.