大体积混凝土真实温度场演化规律试验

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清华大学辅仁网/2017-07-07

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

摘要:

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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。

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 words：hydraulic 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

图表:

通水智能温度系统结构示意图^[9-11]

1—内插数字测温装置; 2—浇筑时预埋入混凝土块中数字温度传感器; 3—智能控制箱; 4—控制服务器;5—双向智能控制阀; 6—双向涡轮流量计;7 —一体化流量和温度控制装置

25#32仓混凝土内部温度场演化分布

温度积累阶段混凝土内部温度变化率曲线

混凝土温度与弹性模量的变化过程

李家峡拱坝11#-13#坝段温度裂缝示意图

25#32混凝土温度与通水冷却的过程线

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