大型渡槽温控防裂技术及发展趋势

介绍南水北调工程大型渡槽在材料性质、结构设计、施工措施等方面温控防裂的基本经验;针对渡槽薄壁结构的特点,阐述短期温度应力和温湿耦合作用下渡槽的开裂机理;从温度监测、温度场实时仿真和预报、早龄期混凝土开裂风险预报、施工信息平台搭建、限裂设计下渡槽混凝土温控标准制定等方面探讨渡槽温控防裂的发展趋势。

Techniques and development trends of temperature control and crack prevention of large-scale concrete aqueducts

The temperature control experience of large-scale concrete aqueducts in China's South-to-North Water Diversion Project was introduced, such as material properties,structural design and construction measures.The cracking mechanism of the concrete aqueducts under short-term thermal stress and coupling of heat and moisture diffusion effect was illustrated as regards the features of the aqueduct with thin-walled structure.Finally,the development trends of temperature control and crack prevention of concrete aqueducts were discussed from the aspects of temperature monitoring,real-time temperature simulation and prediction,early-age concrete cracking risk prediction,construction information platform and temperature control standards for concrete aqueducts under crack-control design.