| 混凝土大坝冻融破坏问题的数值计算分析 |
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| 引用本文： | 李守巨,刘迎曦,陈昌林,李正国.混凝土大坝冻融破坏问题的数值计算分析[J].岩土力学,2004,25(2):189-193. |
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| 作者姓名： | 李守巨 刘迎曦 陈昌林 李正国 |
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| 作者单位： | 1.大连理工大学 工业装备结构分析国家重点实验室，辽宁 大连 116024； 2.丰满发电厂，吉林 吉林 132108 |
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| 基金项目： | 国家自然科学基金(No. 10072014) |
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| 摘 要： | 根据大坝上游水库水温和气温观测资料，建立了大坝上游水库水温和当地气温的回归模型。采用有限元数值计算方法，分析了混凝土大坝的温度场，研究了混凝土大坝由于气温变化引起的应力场交替变化。研究表明，由于气温随季节的交替变化，大坝下游面浅层的最大主应力远大于混凝土的抗拉强度，进而导致混凝土大坝下游面的冻融老化甚至破坏。计算结果表明，有限元数值模拟结果与现场勘查结果基本一致。
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| 关 键 词： | 混凝土大坝 冻融 热应力 加固 |
| 文章编号： | 1000-7598-(2004)02-0189-05 |
| 收稿时间： | 2002-09-02 |
| 修稿时间： | 2002年9月2日 |
Numerical computation and analysis of fracturing problems of concrete dam owing to freezing and thawing |
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| LI Shou-ju,LIU Ying-xi,CHEN Chang-lin,LI Zheng-guo.Numerical computation and analysis of fracturing problems of concrete dam owing to freezing and thawing[J].Rock and Soil Mechanics,2004,25(2):189-193. |
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| Authors: | LI Shou-ju LIU Ying-xi CHEN Chang-lin LI Zheng-guo |
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| Institution: | 1. State Key Laboratory of Structural Analysis of Industry Equipment, Dalian University of Technology, Dalian 116024, China; 2. Fengman Hydropower Plant, Jilin 132108, China |
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| Abstract: | Based on the measuring water temperatures and weather temperatures, the regression models of water temperatures and weather temperatures in different seasons were proposed. By making use of finite element method, the temperature fields of concrete dam in different seasons were investigated, and then the changes of stress fields of concrete dam were analyzed because the weather temperature changes seriously with seasons in the cold regions. The research shows that the first principal stress of concrete dam near downstream surface can be over the tensile strength of concrete, and bring about freezing and thawing deterioration in concrete dam. The numerically computational results demonstrate that the simulating values with finite element method can approach to in-situ prospecting values. |
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| Keywords: | concrete dam freezing and thawing thermostress reinforcing construction |
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