| 摘要: |
| 混凝土防渗墙是建在覆盖层地基上的混凝土面板堆石坝的主要渗流控制措施。防渗墙为隐蔽结构,其力学性态受覆盖层地基变形和渗流效应影响,直接影响地基防渗效果和大坝结构安全。本文通过统计分析和数值模拟的方法,对覆盖层地基上面板堆石坝混凝土防渗墙的力学性能进行了研究。基于多个工程实例的变形数据,对防渗墙性态进行了统计分析。建立了考虑地基渗流—流变耦合效应的防渗墙力学行为数值计算模型。采用九参数流变模型模拟地基流变行为。采用水力耦合分析方法模拟地基渗流—流变耦合效应。结合实测数据和数值模拟结果,对防渗墙性态进行了分析。还讨论了地基渗流-流变耦合效应、大坝施工速度、防渗墙施工顺序和防渗墙深度对防渗墙力学性能的影响。 |
| 关键词: 混凝土防渗墙 面板堆石坝 渗流-流变耦合作用 应力变形 数值计算 |
| DOI： |
| 分类号:TV331 |
| 基金项目:国家自然科学(52039008,52125904)；陕西省教育厅科研项目(23JP113)；中国博士后科学基金(2021T140554, |
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| Behavior of a concrete-face rockfill dam cutoff wall considering the foundation seepage-creep coupling effect |
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ZHU Linsong1, SUN Xuewu1, DENG Jiechuan1, Wen Lifeng2, CAO Weifeng2
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1.CCCC Hehai Engineering Corporation Limited;2.Xian University of Technology
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| Abstract: |
| The concrete cutoff wall is the main seepage control measure for concrete-face rockfill dams (CFRDs) constructed on alluvium foundations. The cutoff walls are concealed structures, their working behavior influenced by alluvium foundation deformation and the seepage effect as critical factors. Cutoff wall behavior directly affects the foundation seepage control effect and the dam’s structural safety. The behavior of concrete cutoff walls in CFRDs built on alluvium foundations was investigated in this study through statistical analysis and numerical simulation. The cutoff wall behavior was statistically reviewed based on deformation data from several case histories. A numerical calculation model for the mechanical behavior of the cutoff wall, considering the foundation seepage–creep coupling effect, was established. A nine-parameter creep model was adopted to simulate the foundation creep behavior. The foundation seepage–creep coupling effect was simulated using a hydromechanical coupling analysis method. The cutoff wall behavior was analyzed using a combination of measured data and numerical results. The effects of the foundation seepage–creep coupling effect, dam construction speed, cutoff wall construction sequence, and depth of the cutoff wall behavior are also discussed. |
| Key words: Concrete cut-off wall Seepage–creep coupling effect stress and deformation behavior numerical calculation influencing factors |
