混凝土面板堆石坝的堆石本构模型与应力变形分析

Analysis of Stresses and Deformations of Concret-face Rockffil Dam

本文用三维非线性有限元详细分析了混凝土面板堆石坝的应力变形特性。着重研究了堆石体的本构关系,用修正邓肯E—v模型、邓肯E—B模型、内勒K—G模型作了应力、变形分析,得到坝体变形、周边接缝和竖向伸缩接缝变形、面板变形和应力等成果,与已建成面板堆石坝的观测资料作比较,认为邓肯E—B模型、内勒K—G模型计算成果与观测资料的规律相一致,而修正邓肯E—v模型计算得到蓄水后面板的挠度偏小,拉应力偏大。这种模型对混凝土面板堆石坝的有限元分析不适用。

In this paper, the characteristics of stresses and deformations of concrete-face rockf ill dam (CFRD)are analysed in details by tri-dimensional non-linear FEM.The authors emphatically study some constitutive models. The modified Duncan E-ν model, Duncan E-B model and Naylor K-G model are used, giving the deformations of dam body peripheral joint, vertical joint and concrete face as well as stresses. The computed results with Duncan E-B model and Naylor K-G model are conformed with the observed data. The computed results with modified Duncan E-ν model are on the small side and the tensile stress is on the big side. Therefore, Duncan E-ν model isn't suited for FEM of CFRD.