关键词: 碾压混凝土;温控仿真;浇筑温度;表面保温;防裂措施;

Abstract: Temperature load is one of the main loads of RCC dams, its value directly affects whether the dam produces temperature cracks, and affects the safe and stable operation of the dam. Due to the small amount of cementing material and low concrete temperature rise in RCC dams, temperature control measures are often considered to be simplified or eliminated. However engineering experiences show that temperature control measures are indispensable during the construction of RCC gravity dams. Taking Zhouning RCC gravity dam as an example, using three-dimensional finite element method, we discussed the difference between presence and absence of temperature control measures. At the same time, the sensitivity analysis on the pouring temperature and the key temperature control parameters of the surface insulation were carried out to study its effect on the dam temperature and the degree of influence of temperature stress. The calculation results showed that temperature control requirements could not be met without temperature control measures, and lower pouring temperature and appropriate surface insulation could play a better role in temperature control and crack prevention. The temperature control and crack prevention measures and ideas used in this project can provide significant reference value for the temperature control and crack prevention of similar projects.

Key words: temperature control simulation; RCC; pouring temperature; surface insulation; crack prevention measures