摘要
对白鹤滩大坝典型坝段开展了孔口底板部位及侧墙部位混凝土表层温度监测试验,在考虑太阳辐射热的基础上,通过仿真分析的方法计算孔口部位混凝土的温度场,计算所得的混凝土温度与实测值吻合较好。利用精度较高的孔口局部三维有限元模型,对孔口部位不同温控措施的温控效果展开分析,分别针对冷却水管间距、冷却通水水温等因素,对比仿真计算结果选出有利于温控防裂的温控措施。研究结果表明:在高温季节浇筑孔口混凝土时,太阳辐射对混凝土的温度影响较大,尤其是早期混凝土,把太阳辐射热等效成气温的方式,最大可在气温的基础上叠加11.62℃。采用1 m×1.5 m的冷却水管布置方式有利于降低混凝土最高温度及内外温差,在浇筑初期,10~13℃的冷却水温对孔口部位混凝土的冷却效果基本一致。
A typical dam section of Baihetan Dam is tested for monitoring the temperature of concrete surface layer in the bottom plate and side wall of the orifice,and then the temperature field of concrete in the orifice is calculated by simulation analysis on the basis of considering solar radiation heat.The calculated temperature of concrete is in good agreement with the measured value.Afterwards,the local three-dimensional finite element model of the orifice with high precision is used to analyze the temperature control effect of different temperature control measures in the orifice area,and the temperature control measures conducive to temperature control and anti-cracking are selected by comparing the results of simulation calculations with the factors such as the cooling water pipe spacing and the water temperature of cooling water supply.The study results show that,when pouring orifice concrete in hot season,the solar radiation has a significant impact on the temperature of concrete,especially the in the early stage of concrete,and the maximum temperature can be superimposed by 11.62℃on the basis of the air temperature by equivalent solar radiation heat to air temperature.Adopting 1 m×1.5 m cooling water pipe arrangement is conducive to reducing the maximum temperature of concrete and the temperature difference between the inside and outside.In the early stage of pouring,the cooling water temperature of 10-13℃has basically the same cooling effect on the concrete at the orifice.
作者
王月
吴焱彬
张洋
王峰
赵驰
WANG Yue;WU Yanbin;ZHANG Yang;WANG Feng;ZHAO Chi(China Huashui Hydropower Development Co.,Ltd.,Beijing 101100,China;College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei,China)
出处
《水力发电》
2025年第8期67-76,共10页
Water Power
基金
国家自然科学基金资助项目(51809154)。
关键词
大坝孔口
温度监测
太阳辐射热
温控措施
白鹤滩水电站
dam orifice
temperature monitoring
solar radiation heat
temperature control measures
Baihetan Hydropower Station
