Temperature Control and Crack Prevention Scheme for Tail Floor of Large Hydropower Stations in High-Altitude Regions

Temperature control and crack prevention for the tail floor of a large hydropower station are difficult in high-altitude regions. Therefore, research on fine temperature control and crack prevention according to climatic characteristics is necessary. Temperature stress and temperature control measures for the tail structure of a hydropower station in a high-altitude region are studied based on the three-dimensional finite element method, considering the climate characteristics in high-altitude regions and the limitation of conventional temperature control and crack prevention measures. The results show that the conventional pouring temperature control measures, water cooling measures, and surface insulation measures are unable to control the temperature stress of concrete within the safe range. The reasonable block-divided pouring measures (to avoid long pouring interval), reasonable post-pouring belt measures, and strong heat preservation measures are crucial to effectively control the thermal stress and ensure the structural safety. Based on the research and practice of concrete crack prevention in hydropower stations, during construction in high-altitude regions, the temperature and spatial distribution of concrete temperature stress, and a set of comprehensive crack prevention measures suitable for high-altitude climate conditions, construction conditions and structural characteristics of powerhouse are summarized and have reference significance for similar projects.