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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。
The purpose of this paper is to reveal the evolution law of the temperature field of large-volume concrete through water cooling and provide the basis for the temperature control and crack prevention optimization design of concrete dams. By carrying out on-site water cooling test, the real temperature of concrete and the temperature change of water inlet and outlet are analyzed Data to study the distribution characteristics of real temperature field, evolution and its influencing factors. The results show that the evolution of the true temperature field from the non-uniform distribution to the homogeneous distribution and the early cooling characteristics of the concrete can be summarized as three stages of heat accumulation, heat release and heat transfer. Based on the example of dam temperature cracking, the mechanism of cracking along the dam axis is analyzed from the evolution of temperature field. The research results have reference significance for temperature control and cracking prevention of concrete in construction of UHV arch dam.