中文摘要：

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.

英文摘要：

The control of the temperature within a mass concrete structure can be attained by various means depending on the situation.By owing cold water through built-in pipes in the mass concrete structure is an effective measure.The built-in pipes are usually arranged in a regular lattice such that a control temperature field within the concrete can be attained.But the current water cooling method can cause the large temperature gradient and the large concrete temperature falling velocity near the pipe.They are not conducive to the concrete crack prevention.So this paper gives the small temperature difference and long-term water cooling methord.The paper analyzes the small temperature difference and long-term water cooling methord based on 3D FEM precise algorithm.The results show the disadvantages of the existing water cooling method,which causes the large temperature gradient and the large concrete temperature falling velocity near the pipe and the advantages of the small temperature difference and long-term water cooling method,which can effectively reduce the temperature gradient and stress of concrete by a case study.