赵泽湖,周秋景,牟荣峰,杨宁,张家豪.混凝土拱坝通水冷却同仓混凝土温差对坝体应力的影响[J].中国水利水电科学研究院学报,2019,17(2):110-117
混凝土拱坝通水冷却同仓混凝土温差对坝体应力的影响
Stress analysis of temperature difference in a cooling block of concrete arch dam
投稿时间:2017-11-16  
DOI:10.13244/j.cnki.jiwhr.2019.02.004
中文关键词:  拱坝  仿真分析  同仓温差  温度应力
英文关键词:arch dam  simulation analysis  temperature difference  thermal stress
基金项目:国家重点研发计划项目(2016YFB0201000);中国长江三峡集团公司科研项目(WDD0431,WDD0432,XLD/2114);国家自然科学基金项目(51579252,51439005);中国水科院基本科研业务费项目(SS0145B512017)
作者单位
赵泽湖 中国水利水电科学研究院 结构材料研究所, 北京 100038 
周秋景 中国水利水电科学研究院 结构材料研究所, 北京 100038 
牟荣峰 中国长江三峡集团公司, 北京 100038 
杨宁 中国长江三峡集团公司, 北京 100038 
张家豪 中国水利水电科学研究院 结构材料研究所, 北京 100038 
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中文摘要:
      针对混凝土拱坝浇筑过程中同仓混凝土不同区域温度存在差异问题,定性分析了同仓温度差异原因,采用仿真方法分析了同仓温差对应力的影响。分析结果表明:(1)同仓混凝土温度存在差异主要原因有两种,一是仓内各温度计埋设点与冷却水管距离不一致引起的测值差异;二是冷却水管长度不同、施工过程中挤压变形不同等导致流速流量差异。(2)不同温差形式对顺河向应力分布规律有一定影响,最大应力均出现在仓块中间位置,但向温度最低的区域有所偏移,此外,中上部出现温度最低的温差形式对应力较为不利。(3)最小温度降幅一定时,温差越大,应力差异越明显,温差每增大2~3℃,顺河向应力和横河向应力均增大0.2~0.3 MPa左右。在保证各支温度计不出现较大幅度超冷情况下,同仓温差对浇筑仓混凝土安全性能无明显影响。研究结果为拱坝温度应力控制及防裂措施提供了参考。
英文摘要:
      According to the fact that temperature difference exists in a cooling block of concrete arch dam, this article analyzes the causes of temperature difference and uses the simulation analysis method to analyze the effect of temperature difference on stress. The results show three key points. (1)There are two reasons for the temperature difference. Firstly, the different distance between thermometers and cooling pipes causes the different value of temrmometer, and the difference would be smaller in reality. Secondly, both the different length of cooling pipes and extrusion deformation of pipe which may result in the difference of flow also could lead to the temperature difference. (2)Various forms of temperature difference have some influence in stress distribution law. The maximum stress is on the middle of block, but the position would move a small distance towards lowest temperature area. Moreover, the minimum temperature occurs at the upstream or middle of the concrete block are most serious to the stress. (3)There are obvious stress differences increasing the temperature difference as the minimum temperature drop is same. Temperature difference increase 2℃ or 3℃ which means stress increase 0.2MPa or 0.3MPa in both transverse direction and stream direction. The security of concrete would have little change if the lowest temperature could be under the design permission. This result provides a reference for the control of thermal stress and crack of Arch Dam.
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