关键词: 周宁抽水蓄能电站大坝, 碾压混凝土, 施工工艺, 浇筑层厚, 温度应力

Abstract: RCC dams are favored because of the advantages of small cement consumption, low adiabatic temperature rise as well as simple and rapid construction. But the thermal crack of concrete is a long concerned problem, which not only affects the external appearance of dams, but also affects the projects' quality and security. Pouring time, layer thickness and pouring interval have important influence on the temperature stress of dam structure. Optimal pouring time, improved layer thickness and well-controlled pouring interval can reduce temperature stress and minimize cracking risk. Taking RCC dam of Zhouning pumped storage power station as an example, the temperature stress of concrete with different pouring time, layer thickness and pouring interval was simulated by use of three-dimensional finite element method. The results show that too short pouring interval and too thin layer are not helpful to the temperature control and crack prevention, and pouring concrete in strong restraint zone in high temperature season will increase the cracking risk.

Key words: Zhouning pumped storage power station dam, RCC, construction technology, pouring layer thickness, temperature stress