| 高寒地区高拱坝外掺MgO混凝土的温度应力补偿效果研究 |
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| 引用本文： | 张续,刘杏红,井向阳,王琼,常晓林. 高寒地区高拱坝外掺MgO混凝土的温度应力补偿效果研究[J]. 水电能源科学, 2013, 31(11): 82-85 |
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| 作者姓名： | 张续 刘杏红 井向阳 王琼 常晓林 |
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| 作者单位： | 武汉大学 水资源与水电工程科学国家重点实验室， 湖北 武汉 430072;武汉大学 土木建筑工程学院， 湖北 武汉 430072;武汉大学 水资源与水电工程科学国家重点实验室， 湖北 武汉 430072;武汉大学 水资源与水电工程科学国家重点实验室， 湖北 武汉 430072;武汉大学 水资源与水电工程科学国家重点实验室， 湖北 武汉 430072 |
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| 基金项目： | 中央高校基本科研业务费专项资金资助项目（201120602020010） |
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| 摘 要： | 鉴于外掺MgO微膨胀混凝土筑坝技术对提高高寒地区混凝土坝的施工速度和经济效益的意义，对高寒地区高拱坝外掺MgO混凝土的温度应力进行了仿真计算，分析了不同MgO掺量对温度应力补偿效果的影响及坝体不同部位掺MgO的膨胀补偿效果。结果表明，在大坝内部，掺MgO对混凝土能起到较好的温度应力补偿作用，且在一定范围内MgO掺量越大，应力补偿作用越明显；对大坝表面混凝土，掺MgO可能使混凝土表面拉应力增大，可通过加强表面保温来有效控制表面拉应力，且宜采用长期保温的温控措施。
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| 关 键 词： | 高寒地区； 高拱坝； 外掺MgO混凝土； 温度应力补偿 |
Study on Effect of Thermal Stress Compensation for MgO Concrete of High Arch Dam in Cold Area |
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| ZHANG Xu,LIU Xinghong,JING Xiangyang,WANG Qiong and CHANG Xiaolin. Study on Effect of Thermal Stress Compensation for MgO Concrete of High Arch Dam in Cold Area[J]. International Journal Hydroelectric Energy, 2013, 31(11): 82-85 |
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| Authors: | ZHANG Xu LIU Xinghong JING Xiangyang WANG Qiong CHANG Xiaolin |
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| Affiliation: | State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;School of Civil Engineering, Wuhan University, Wuhan 430072, China;State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China |
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| Abstract: | Study of concrete mixed with MgO micro-expansion dam construction technology has great significance to increase the speed of concrete dam construction in cold area and raise economic benefits. Thermal stress of concrete mixed with MgO high arch dam in cold area is simulated. It analyzes the influence of different MgO content on stress compensation effect as well as different parts of the dam expansion compensation effect of MgO concrete. The results show that inside the dam, mixed with MgO is better for compensate of thermal stress; within a certain range, the MgO content is larger, the stress compensation is more obvious; but on the surface concrete of the dam, mixed with MgO increases tensile stress of surface concrete; through strengthening thermal preservation can effectively control tensile stresses on the surface, and long-term thermal preservation is preferable. |
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