西津二线船闸基岩强约束区底板施工期温控防裂研究  

Research on Temperature Control against Crack in Construction of Concrete Bottom Plate of Xijin Line-2 Ship-Lock in Strongly Constrained Bedrock Area

作　　者：李发章 于方[2] 李帅江 肖诗廉 雷平 Li Fazhang;Yu Fang;Li Shuaijiang;Xiao Shilian;Lei Ping(The Third Engineering Company of CCCC Fourth Harbor Engineering Co.,Ltd.,Zhanjiang Guangdong 524005,China;Key Laboratory of Harbor&Marine Structure Durability Technology of the Ministry of Communications,CCCC Forth Harbor Engineering Institute Co.,Ltd.,Guangzhou Guangdong 510230,China;Guangxi Bagui Project Supervision Consulting Co.,Ltd.,Nangning Guangxi 530000,China)

机构地区：[1]中交四航局第三工程有限公司,广东湛江524005 [2]中交四航工程研究院有限公司,水工构造物耐久性技术交通行业重点实验室,广东广州510230 [3]广西八桂工程监理咨询有限公司,广西南宁530000

出　　处：《港口航道与近海工程》2025年第2期94-99,共6页Port,Waterway and Offshore Engineering

摘　　要：针对强约束区船闸底板施工期易开裂问题,本文以西津二线船闸浇筑底板为例,模拟混凝土入模温度和分层厚度下混凝土结构温度场的空间、时间分布。结合混凝土约束应力模型和抗拉强度模型,开展底板施工期在自约束应力和外约束应力作用下的开裂风险评估。结果表明:分层厚度固定时,入模温度越低混凝土结构的开裂风险越小;入模温度固定时,分层厚度越大混凝土结构的开裂风险越小;入模温度对底板抗裂的影响大于分层厚度对底板抗裂的影响;在基岩强约束区浇筑船闸底板,应优先降低混凝土入模温度,同时结合合理的分层工艺,从而更好的控制船闸底板混凝土裂缝。As for the cracking issue of ship-lock bottom plate in the strongly constrained area during the construction period,by referring to the bottom plate pouring of Xijin line-2 ship-lock,simulating the spatial and temporal distribution of concrete temperature fields under the conditions of concrete initial temperature and various thickness by layers.A concrete constraint stress model was combined with a tensile strength model to carry out the assessment of bottom plate crack risk under the self-constraint stress and external constraint stress during the construction period.Results showed that lower concrete initial temperature led to lower structure crack risk subject to the thickness each layer being fixed.Larger layer thickness resulted in lower crack risk subject to a fixed initial temperature.The bottom plate crack resistance was mainly affected by concrete initial temperature instead of the thickness by layers.In the pouring process of ship lock bottom plate in a strongly constrained bedrock area,priority should be given to the increase in concrete initial temperature,meanwhile,an appropriate layering process should be adopted for crack control.

关 键 词：船闸底板 大体积混凝土 施工工艺 裂缝控制 

分 类 号：TV315[水利工程—水工结构工程] U641[交通运输工程—船舶及航道工程]