拱坝横缝的张开温度及其应用

拱坝横缝工作性态是评价大坝全生命周期性能的重要组成部分，利用温度值对其特性开展研究并实现对其控制，具有重要的实际价值。本文通过分析实际工程数据，总结了拱坝横缝随坝块混凝土内部温度变化的规律。定义了拱坝横缝的张开温度并推导了其计算方法，阐述了横缝张开温度在实际工程中的具体应用。结果表明：横缝张开温度可作为判断横缝工作性态的重要指标，并以此为依据为工程提供个性化优化措施，达到精准控制横缝张开时机及张开量的目的。

Opening temperature of transverse joints of arch dams and its application

Behaviors of the transverse joints of an arch dam are crucial to evaluating its performance in the whole life cycle. A practically important issue is to study and control the joint characteristics through temperature control. Based on analysis of the engineering data, this paper summarizes the trends of changes in the transverse joints with different internal temperatures in the concrete of dam blocks. We define the opening temperature of a transverse joint and derive its calculation method. The results show that the opening temperature can be used as a key index of joint performance. Based on this, measures for the individualized optimization of an arch dam are provided to achieve a precise control of the opening time and opening amount of its transverse joints.