关键词: 大体积混凝土, 温度应力场, 温控防裂, 碾压混凝土坝, 高温炎热地区

Abstract: Temperature control and crack prevention of mass concrete is the key technical problem in the construction of water conservancy and hydropower projects. In high temperature area, the temperature control and crack prevention of RCC gravity dam during construction period is very demanding and difficult, so the temperature control measures in high temperature are obviously different from that in normal temperature area and cold area. Aiming at Xinchun Reservoir RCC gravity dam project in Hainan Province, we used finite element analysis software to simulate the distribution of temperature and stress field during construction period, analyzed and determined the sensitive factors affecting temperature control and crack prevention. Based on this analysis and other similar projects, we put forward corresponding temperature control standards and measures, which have been verified by engineering practices. The results show that the temperature and stress meet the need of standards requirements.The research results have been applied to the Hainan Xinchun Reservoir RCC gravity dam project, which has reference value for temperature control and crack prevention of similar projects.

Key words: mass concrete, thermal stress field, temperature control and crack prevention, RCC dam, high temperature area;