| 瀑布沟大坝防渗墙应力分布特性及机理探讨 |
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| 引用本文： | 吕洪旭,陈科文,邓建辉,郑俊.瀑布沟大坝防渗墙应力分布特性及机理探讨[J].人民长江,2011,42(10):39-43. |
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| 作者姓名： | 吕洪旭 陈科文 邓建辉 郑俊 |
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| 作者单位： | 1. 四川大学,水利水电学院,四川,成都,610065
2. 南充市水务局,四川,南充,637000 |
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| 基金项目： | 国家自然科学基金资助项目(50974091); 国家重点基础研究发展规划(973)项目(2010CB226802,2010CB732005) |
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| 摘 要： | 瀑布沟水电站大坝为砾石土心墙堆石坝，坝基为深厚河床覆盖层，最大深度达到75.36 m。坝基覆盖层防渗采用两道各厚1.2 m的全封闭式混凝土防渗墙。为了探讨防渗墙的应力分布特性，首先，根据瀑布沟水电站大坝施工期应变监测成果，综合分析墙体应变变化分布特征；其次，基于混凝土徐变和应力松弛理论，应用松弛法将混凝土应变转换为应力；最后，综合各相关影响因素对防渗墙应力分布机理进行探讨。结果表明：偏应变所占比例基本上在5%以内，施工期防渗墙未出现较大偏心受压的情况；防渗墙最大压应力发生在墙体中部，其量值为顶部和底部的7～9倍；影响防渗墙应力分布的主要原因是墙体和河床覆盖层不均匀沉降（变形不协调）而产生的负摩阻力。分析指出：在防渗墙的结构设计中应重点考虑负摩阻力的影响。
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| 关 键 词： | 防渗墙 应力应变 机理 松弛法 负摩阻力 瀑布沟大坝 |
Discussion on mechanism and stress distribution features of diaphragm walls of Pubugou Hydropower Station during construction period |
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| LU Hongxu,CHEN Kewen,DENG Jianhui,ZHENG Jun.Discussion on mechanism and stress distribution features of diaphragm walls of Pubugou Hydropower Station during construction period[J].Yangtze River,2011,42(10):39-43. |
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| Authors: | LU Hongxu CHEN Kewen DENG Jianhui ZHENG Jun |
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| Affiliation: | LV Hongxu1,CHEN Kewen2,DENG Jianhui1,ZHENG Jun1(1.College of Hydraulic and Hydroelectric Engineering,Sichuan University,Chengdu 610065,China,2.Nanchong Water Authority,Nanchong 637000,China) |
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| Abstract: | The dam of Pubugou Hydropower Station is a gravelly soil core rockfill dam,and its foundation is in a deep riverbed overburden layer with the maximum depth of 75.36m.The seepage works of the dam foundation overburden layer are two fully enclosed concrete diaphragm walls with 1.2m thick each.We discuss the stress distribution features.Firstly,according to the monitoring result of the strain of the station during construction period,we analyze the distribution features of the strain of the wall comprehensivel... |
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| Keywords: | diaphragm wall stress-strain mechanism relaxation method negative friction Pubugou Hydropower Station |
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