水力发电2024，Vol.50Issue(6)：61-66,6.
膨胀剂和后浇带对超长环形底板混凝土防裂的影响研究
Research on the Influence of Expansion Agent and Post Pouring Strip on the Cracking Prevention of Super Long Annular Base Plate Concrete
摘要
Abstract
The fourth generation high-energy synchrotron radiation light source with the highest brightness in the world has an ultra long annular base plate with a circumference of approximately 1 494 m and a thickness of 1 m.How to ensure the construction quality of concrete floor and prevent cracking is a difficult problem in the project.By using the finite element three-dimensional numerical analysis program,the jumping pouring process of base plate concrete is simulated according to the actual construction process,and the temperature and temperature stress changes of the base plate are also simulated and analyzed.The calculated temperature results are compared with the measured temperature results to verify the rationality and accuracy of thermal parameters.On the basis of inverse analysis,the temperature control and cracking prevention effects of expansion agents and post pouring strips are studied.The research results indicate that,(a)early expansion type autogenous deformation(Type I)has a favorable effect on the early age stress of concrete,but the delayed expansion compensation of late expansion type autogenous deformation(Type III)is beneficial for reducing the maximum tensile stress of the base plate in winter due to the stress caused by concrete shrinkage and temperature drop;and(b)as setting up a post pouring strip can reduce the length of base plate concrete pouring blocks,the maximum tensile stress of the concrete can be reduced by 6.65%.关键词
混凝土/环形底板/膨胀剂/后浇带/反演分析/温度应力Key words
concrete/annular base plate/expansion agent/post pouring strip/inverse analysis/temperature stress分类
建筑与水利引用本文复制引用
任锦龙,荣慕宁,王振红,邢国荣,汪娟,张步,张凯恒..膨胀剂和后浇带对超长环形底板混凝土防裂的影响研究[J].水力发电,2024,50(6):61-66,6.基金项目
国家重点研发计划项目(2021YFC3090102,2021YF-C3090104) （2021YFC3090102,2021YF-C3090104）
国家自然科学基金资助项目(52192672) （52192672）
流域水循环模拟与调控国家重点实验室自主研究项目(SKL2022ZD05) （SKL2022ZD05）
