100 m级高面板堆石坝应力变形分析

陆 静1， 胡仲萍2

(1.杨凌职业技术学院水利工程分院， 陕西 杨凌 712100; 2.渭南市洛惠渠管理局， 陕西 渭南 715100 )

摘要：采用邓肯张E-B非线性弹性模型，利用自动剖分程序建立三维模型，对某100 m级高面板堆石坝进行三维有限元数值模拟计算，并选取合适的反映堆石料流变特性的本构模型分析了坝体的应力变形情况。结果表明:坝体的位移和应力分布规律基本合理，数值大小都在允许的范围内，但在堆石流变作用的影响下，坝体的应力变形明显增大，流变作用对坝体的影响不可忽略，本文为坝体的设计和施工提供支撑。

关键词：面板堆石坝； 本构模型； 应力变形； 流变

收稿日期：2015-03-24

作者简介：陆 静(1987)，女，陕西武功人，硕士，助教，专业教师，主要研究方向：土石坝。

中图分类号：TV641.43

Analysis on Stress and Deformation of 100m High CFRD

LU Jing1, HU Zhong-ping2

(1.Branch College of Hydraulic Engineering, Yangling Vocational and Technical College, Yangling, Shaanxi 712100, China;

2.Luohui Cannel Administration Bureau of Weinan City, Weinan, Shaanxi 715100, China)

Abstract:In order to study the influence of material properties on dam stress and deformation, this paper established three-dimensional solid models by applying Duncan-Chang Model nonlinear elastic model with automatic mesh program, the three-dimensional finite element of a 100m high CFRD was numerically simulated, and appropriate constitutive model that could reflect the rheological characteristics of materials was adopted to analyze the stress and deformation of the dam body. The result shows that dam displacement and distribution of stress is basically reasonable, the numerical values are in a permitted range. But the stress and deformation of dam increases significantly under the influence of rheological effect, which can't be neglected. This paper can be used as a reference for dam body design and construction.

Key words: CFRD; constitutive model; stress and deformation; rheology

面板堆石坝因其安全性好，适应性强而成为一种富有竞争力的坝型。其筑坝材料由上游防渗混凝土面板、垫层料、过渡料和主、次堆石料组成，筑坝堆石的材料特性对坝体的应力变形有直接影响[1]。堆石料是非线性材料，应力变形随荷载的大小而变化，除在外力作用下的瞬时变形，筑坝堆石料的流变特性[2]使得坝体的应力变形随时间的延长而增大，已有研究也表明，堆石料的流变特性对坝体应力变形的影响不可忽视[2~7]。因此堆石料静力本构模型和流变模型对能否合理的模拟坝体的应力变形有重要影响。

目前，邓肯-张模型(Duncan-Chang)简单易于理解并能反映土体变形的主要特点而在工程界和学术界都得到了广泛的应用[2]。……