考虑温湿场耦合应力的衬砌湿养护最短时间确定  

Determination of shortest wet curing time for lining considering coupling stress of temperature and humidity field

作　　者：邱岗 孙明明[2,3,4] 薛冰寒 李斌 QIU Gang;SUN Mingming;XUE Binghan;LI Bin(Xinyang Vocational and Technical College,Xinyang 464000,China;School of Hydraulic and Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou 450001,China;Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety,Zhengzhou 450001,China;Yellow River Laboratory,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]信阳职业技术学院,河南信阳464000 [2]郑州大学水利与交通学院,河南郑州450001 [3]重大基础设施检测修复技术国家地方联合工程实验室,河南郑州450001 [4]水利与交通基础设施安全防护河南省协同创新中心,河南郑州450001 [5]黄河实验室(郑州大学),河南郑州450001

出　　处：《人民长江》2023年第10期127-134,共8页Yangtze River

基　　金：2023年度河南省高等学校重点科研项目(23A560013);国家自然科学基金项目(52278378,52208375);“十四五”重点研发计划项目(2022YFC3801001)。

摘　　要：混凝土衬砌的湿养护是决定结构安全的关键因素。采用有限元法对大型衬砌结构进行建模求解,获得了衬砌结构浇筑过程中两种主要应力(温度应力和干缩应力)的极值位置和方向。基于简易温湿场耦合应力计算方法,结合混凝土允许抗拉强度变化趋势,明确了衬砌结构湿养护最短时间。研究结果表明:干缩应力对衬砌结构危害程度要远大于温度应力;对于薄壁混凝土结构,通过湿养护可以延后衬砌浇筑中耦合应力极值出现时间,降低衬砌开裂风险;在考虑温度应力的作用下,明确薄壁混凝土结构最短养护时间是防止干缩裂缝出现的关键。The wet curing for concrete lining is a key factor to determine its structural safety.In this paper,the shortest wet curing time after the completion of large-scale lining structure pouring was studied.Firstly,the finite element method was used to model and solve the large-scale lining structure,and the two main stresses in the lining pouring process were obtained,the position and direction of the extreme value of temperature stress and shrinkage stress.Then,based on the simple temperature-humidity field coupling stress calculation method,combined with the change trend of allowable tensile strength of concrete,the minimum wet curing time of lining structure was clarified.The results showed that the drying shrinkage stress was more harmful to the lining structure than the temperature stress;for thin-walled concrete structures,wet curing can delay the occurrence time of the extreme value of coupling stress in lining pouring and reduce the risk of lining cracking.Under the action of temperature stress,the shortest wet curing time of thin-walled concrete structure was the key to preventing dry shrinkage cracks.

关 键 词：湿度场 干缩应力 衬砌 温湿耦合应力 养护时间 有限元方法 

分 类 号：TV554[水利工程—水利水电工程]