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清华大学学报(自然科学版)  2015, Vol. 55 Issue (1): 27-32    
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大体积混凝土真实温度场演化规律试验
林鹏(),胡杭,郑东,李庆斌
Field tests on the evolution of a real thermal field in concrete
Peng LIN(),Hang HU,Dong ZHENG,Qingbin LI
State Key Laboratory of Hydroscience and Hydraulic Engineering,Tsinghua University, Beijing 100084, China
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摘要 

旨在揭示大体积混凝土通水冷却温度场演化规律,为混凝土坝温控防裂优化设计提供依据,该文通过开展现场通水冷却试验,分析实时监测的混凝土真实温度和通水进出口温度变化数据,研究真实温度场分布特征、演化规律及其影响因素。研究结果显示: 真实温度场由非均匀性分布向均匀性分布的演化过程,混凝土早期降温特性可以概括为热量积累、热量释放和热量转移这3个特征阶段。结合大坝温度开裂实例,从温度场演化分析了沿坝轴线开裂机制。研究结果对特高拱坝施工期混凝土温控防裂具有参考意义。

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关键词 水利工程大体积混凝土温度场演化开裂控制    
Abstract

The temperature field in a concrete mass was measured during cooling to improve designs for cracking control of high arch dams during construction. Field tests of concrete cooling in a super high arch dam during construction gave real-time data for the concrete temperature during cooling to describe the temperature distribution characteristics and the factors influencing the diffusion. The results show the evolution of the temperature field from a non-uniform distribution to a uniform distribution and the characteristics of the decrease in the concrete temperature which can be generalize into a thermal accumulation stage, thermal release stage and thermal transport stage. Finally, the cracking mechanism along the axial direction of an arch dam was studied basis on the mechanisms during the temperature changes. This study presents ways to control cracking in super high arch dams.

Key wordshydraulic engineering    mass concrete    thermal field evolution    cracking control
收稿日期: 2013-05-13      出版日期: 2015-05-15
基金资助:国家“九七三”重点基础研究项目(2011CB013503, 2013CB035902);国家自然科学基金资助项目(11272178);清华大学自主课题资助(20111081122)
引用本文:   
林鹏,胡杭,郑东,李庆斌. 大体积混凝土真实温度场演化规律试验[J]. 清华大学学报(自然科学版), 2015, 55(1): 27-32.
Peng LIN,Hang HU,Dong ZHENG,Qingbin LI. Field tests on the evolution of a real thermal field in concrete. Journal of Tsinghua University(Science and Technology), 2015, 55(1): 27-32.
链接本文:  
http://jst.tsinghuajournals.com/CN/  或          http://jst.tsinghuajournals.com/CN/Y2015/V55/I1/27
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