| 摘要: |
| 最高温度是混凝土坝温度控制的重要指标。浇筑仓最高温度过高会导致后期降温幅度大，而浇筑仓最高温度过低对混凝土早期力学性能增长有一定影响。实际施工过程中，高温季节浇筑混凝土常出现最高温度超标问题，低温季节浇筑混凝土又常出现最高温度过低的问题。但目前工程单位对最高温度过低的问题关注较少，所以调控施工措施保证浇筑仓最高温度在一个合理范围的研究具有重要意义。结合高温季节岩基上混凝土浇筑块，综合应用数值计算、均匀设计和神经网络技术，通过优选通水参数，探讨混凝土浇筑块最高温度均匀化调控的方法。算例分析表明，对混凝土浇筑块最高温度的均匀化调控是可行的，且可保证混凝土块正台阶形温度分布，满足实际施工过程中接缝灌浆的要求。 |
| 关键词: 最高温度 浇筑仓 通水参数 温度调控 |
| DOI： |
| 分类号:TV431 |
| 基金项目:国家自然科学基金资助项目(51209124)； 三峡大学研究生科研创新基金资助项目 |
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| Uniformity control of highest temperature of concrete block on rock foundation during construction |
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LIAN Di1, HUANG Yao-ying1, ZHANG Qian2, XU Bai-lin1, JING Ji1
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1.College of Hydraulic & Environmental Engineering, Three Gorges University, Yichang;2.Changjiang Institute of Survey, Planning, Design and Research, Wuhan
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| Abstract: |
| The highest temperature is an important index in temperature control of the concrete dam. The highest temperature of the concrete placing area can not be too high nor too low. If the highest temperature is too high, it would cause the larger cooling rate; if the highest temperature is too low, it would have certain effects on early mechanical properties of concrete. During actual construction， the highest temperature may be too high in the high temperature season and too low in the low temperature season. But engineering units pay less attention to the over-low temperature at present. So it is of great significance to adjust cooling measures to ensure the appropriate highest temperature for concrete placing. Thus, a method combined with numerical calculation, uniform design and neural network is used to optimize the cooling measures, which can make sure the uniformity control of the highest temperature. Analyses of calculation examples show that this method is not only feasible but also can ensure appropriate temperature distribution in order to meet the requirements of joint grouting in actual construction process of concrete dams. |
| Key words: highest temperature concrete placing area cooling measures temperature control |
