高混凝土坝温控防裂研究进展

Reviews on temperature control and crack prevention of high concrete dam

本文从仿真分析理论方法、典型裂缝成因及防裂措施、高拱坝及RCC坝温控防裂要点、智能温控4个方面介绍了高混凝土坝温控防裂研究进展;开发了可模拟9个过程、3场耦合、3个非线性的SapTis仿真软件系统,并针对精细建模、计算规模大等要求进行了并行化开发;分析了混凝土坝典型部位的仓面裂缝、劈头裂缝、廊道裂缝及下游面裂缝,并提出了防治措施;给出了高拱坝及RCC重力坝的温度控制要点,主要包括高拱坝的通水冷却设置应重视强调中期冷却并严格控制降温速率,碾压混凝土重力坝应淡化基础温差,强化内外温差的温控措施,智能温控技术是确保温控施工质量的有效手段,可有效避免人工控温可能出现的各种失误,提高施工质量。最后就未来亟待开展的高性能计算、早龄期热力学参数、个性化温控分区标准等问题进行了介绍。

Crack prevention is an important task for the construction of concrete dams. In this paper, the research progress of temperature control and crack prevention for high concrete dams is introduced from 5 aspects： simulation analysis, typical crack causes and crack prevention measures, intelligent temperature control and crack prevention of high arch dam and RCC dam. SapTis simulation software system, whichcan simulate 9 processes, three field coupling and three non-linear, is developed, and parallel calculationis developed for fine modeling and large scale computation. Analysis of the deck cracks, cleavage cracks,cracks in culvert,the downstream face crack in the typical parts of concrete dam,and the preventive measures is puts forward. The key points of temperature control for high arch dams and RCC gravity dams aregiven, and they include water cooling settings for high arch dams, emphasis on medium term cooling,strict control of cooling rate, and the measure of temperature difference control. The intelligent temperaturecontrol technology is an effective means to ensure the quality of the temperature control construction. It caneffectively avoid all kinds of errors caused by artificial temperature control and improve the constructionquality. In the end,the problems of high performance calculation,early age thermodynamic parameters and individual temperature control zoning standards,which are urgently needed in the future,are introduced.