| 三峡深水高土石围堰工程的渗流研究 |
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| 引用本文： | 戴会超,王玲玲.三峡深水高土石围堰工程的渗流研究[J].水科学进展,2005,16(6):849-852. |
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| 作者姓名： | 戴会超 王玲玲 |
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| 作者单位： | 1.中国长江三峡工程开发总公司, 湖北, 宜昌, 443002; |
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| 摘 要： | 为了对三峡工程二期高土石围堰防渗设施的布置方案及其阻渗效果进行比较,采用有限元法对二期高土石围堰在不利的运行工况下的渗流场进行数值分析.比较了双排混凝土防渗墙方案、单排塑性混凝土低防渗墙加土工膜斜墙和单排厚塑性混凝土防渗墙等3种方案,分别采用恒定与非恒定模型计算,对立面二维和三维绕渗及防渗墙局部开裂等不利工况分别进行了数值模拟.结果表明:三方案均可有效抑制渗流场,双排混凝土防渗墙的防渗效果最好;墙体的局部开裂仅对局部区域的流场有影响.非恒定数值分析表明,堰体、基础不均匀沙石料及基坑抽水速度对渗流场影响极大,为保证堰体稳定,应限制基坑水位降落速度小于2 m/d.
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| 关 键 词： | 三峡工程 深水高土石围堰 渗流场 有限元法 |
| 文章编号： | 1001-6791（2005）06-0849-04 |
| 收稿时间： | 2004-09-29 |
| 修稿时间： | 2004-12-30 |
Seepage problems of deepwater high earth-rock cofferdam in Three Gorges Project |
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| DAI Hui-chao,WANG Ling-ling.Seepage problems of deepwater high earth-rock cofferdam in Three Gorges Project[J].Advances in Water Science,2005,16(6):849-852. |
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| Authors: | DAI Hui-chao WANG Ling-ling |
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| Affiliation: | 1.China Yangtze River Three Gorges Project Development Corporation, Yichang 443002, China;2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | In order to compare the effect of different impervious scheme in the second phase cofferdams in the Three Gorges Project(TGP),the finite element method is employed to analyse three arrangement style: double concrete cofferdam,single-low plastic concrete cofferdam combining with geomembrane inclined core and single-thick cofferdam.The 2D and 3D models are used to simulate seepage field of non-safety working station in stable and unstable cases,such as cracking in impervious elements,sudden drop of the water level.The numerical simulation gives out the contour lines of water potential energy in these cases.It shows that the double concrete cofferdam has better impervious effects than the other two schemes.The cracking of the concrete cofferdam affects only on the down stream.From the unstable numerical analyses,the dropping depth of water level should be less than 2 meters per day in order to keep the safety of the cofferdam. |
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| Keywords: | Three Gorges Project deepwater high earth-rock cofferdam seepage field finite element nethod |
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