高海拔地区混凝土坝温控防裂及工程应用研究

Research on the temperature control and cracking prevention of concrete dams at high altitude and its application

我国大型水电资源开发的重心已向云南、四川、青海和西藏等高海拔、高寒地区转移。此类地区气候环境条件恶劣,对混凝土大坝的筑坝技术、温控设计和施工方法提出了新的要求和挑战。本文重点分析介绍了高海拔地区的气候特征、筑坝材料特点、混凝土温度控制的特点以及混凝土温控防裂的关键技术和研究成果,并结合目前在建的西藏地区藏木水电站混凝土重力坝工程,介绍了高海拔、高寒地区混凝土温控技术的应用情况及存在问题。

The majority of hydropower development in China has moved to the high altitude and severe cold provinces such as Yunnan, Siehuan, Qinghai and Tibet. The severe environment presents new demands and challenge to the construction technology, the temperature control design and casting methodologies for building large concrete dams. This paper tries to summarize the characteristics of the climate, construetion material and concrete temperature control, and the key technology and research results of temperature control and cracking prevention of concrete in high altitude areas. Taking the Zangmu hydropower plant concrete gravity dam construction in Tibet as an example, the engineering application of the temperature control technology in high altitude and severe environment and the problems encountered are introduced.