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通水冷却是大体积混凝土温控防裂的主要措施,现有的通水冷却方式要求在短时间内将混凝土温度降低到目标温度,必将在水管附近产生较大的温度梯度,可产生较大的拉应力,不利于水管附近混凝土的防裂,而小温差长期通水冷却方式由于水温与混凝土温度差别较小,可减低降温梯度,减小温度应力.采用三维有限元热流耦合精细算法对大体积混凝土水管的小温差长期通水冷却进行了研究.计算结果表明:现有的通水冷却方式会产生较大的温度梯度和温降速率,使混凝土应力偏大,不利于温控防裂,初步验证了小温差长期通水冷却可以有效地减小混凝土温度梯度和应力的优点.
Water cooling is the main measure of mass concrete temperature control and crack prevention. The existing water cooling method requires that the concrete temperature be reduced to the target temperature in a short period of time, a large temperature gradient will be generated near the water pipe, Large tensile stress is not conducive to crack prevention of concrete near the water pipe, but long-term water cooling by small temperature difference can reduce the temperature gradient and decrease the temperature stress due to the small difference between water temperature and concrete temperature. The results show that the existing water cooling method will produce a large temperature gradient and temperature drop rate, so that the concrete stress is too large, is not conducive to temperature control cracking , Preliminary verified the advantages of small temperature difference long-term water cooling can effectively reduce the concrete temperature gradient and stress.