不同强度衬砌混凝土通水冷却水温优化控制  

Optimization Control of Water Temperature for Water-Cooled Lining Concrete with Different Strengths

作　　者：库智亮 周帅 KU Zhi-liang;ZHOU Shuai(Hubei Dayu Construction Co.Ltd.,Wuhan 430061,China)

机构地区：[1]湖北大禹建设股份有限公司,武汉430061

出　　处：《工程建设与设计》2024年第9期200-202,共3页Construction & Design for Engineering

摘　　要：埋管通水冷却,可以有效降低内部温度和温度应力、降低裂缝风险。但通水冷却水温过低,温降速率过快,可能导致早期裂缝;水温过高,由于结构厚度小,降温效果差。论文对不同强度和不同厚度衬砌结构混凝土采取不同水温(即水温差)通水冷却,采用有限元法仿真计算,进行温度、温度应力、控裂效果深入分析,认识到优化控制水温差ΔTwy和优化控制温降速率Vy随强度近似线性增长,范围在C9025~C9040,ΔTwy为17~30℃,Vy可以达到1.5~3.0℃/d,显著高于分层浇筑大坝等大体积混凝土。The buried pipe is cooled by water,which can effectively reduce the internal temperature and temperature stress and reduce the risk ofcracks.However,the cooling water temperature is too low and the temperature drop rate is too fast,which may lead to early cracks.The water temperature is too high,and the cooling effect is poor due to the small thickness of the structure.By adopting different water temperatures(i.e.water temperature differences)for cooling concrete with lining structures of different strengths and thicknesses,and using finite element method simulation calculations to conduct in-depth analysis of temperature,temperature stress,and crack control effects,it is recognized that the optimized control of water temperature difference△T_(wy)and the optimized control of temperature drop rateVy increase approximately linearly with strength.In the range ofC_(90)25-C_(90)40,△T_(wy),ranges from 17~30 ℃,and V,can reach 1.5~3.0 ℃/d,Significantly higher than large volume concrete such as layered pouring dams.

关 键 词：衬砌混凝土 通水冷却 优化控制 水温差 温降速率 

分 类 号：TV544[水利工程—水利水电工程]