横琴杧洲隧道工程衬砌结构的耐久性与保护层厚度  

Durability and the Tunnel Lining Concrete Steel Protection Layer of the Hengqin Mangzhou Tunnel Project

作　　者：李见伟 胡瑶 张伟[3] 马德群 LI Jianwei;HU Yao;ZHANG Wei;MA Dequn(China Railway Construction Investment Group corporation Limited, Beijing 100855,China;Zhuhai Dahengqin City New Center Development Co.,Ltd.,Zhuhai 519030,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;Guangdong Jianke Innovation Technology Research Institute Co.,Ltd.,Zhongshan 528400,China)

机构地区：[1]中国铁建投资集团有限公司,北京100855 [2]珠海大横琴城市新中心发展有限公司,广东珠海519030 [3]中铁第四勘察设计院集团有限公司,武汉430063 [4]广东建科创新技术研究院有限公司,广东中山528400

出　　处：《广东土木与建筑》2023年第2期112-115,共4页Guangdong Architecture Civil Engineering

摘　　要：为研究影响横琴杧洲隧道工程衬砌结构耐久性的影响因素,设计了水胶比为0.35,0.45和0.55,不同养护龄期下的混凝土,对其开展了RCM快速氯离子电迁移试验。研究结果表明,随着养护龄期的增加,混凝土的扩散系数减少。采用有限元软件模拟氯离子的扩散规律,使用年限100年的水胶比为0.35,0.45和0.55的混凝土保护层厚度分别为50 mm,55 mm和60 mm。To study the influencing factors of the durability of the lining structure of the Hengqin Mangzhou Tunnel Project,the W/C 0.35,0.45 and 0.55 was designed for concrete under different curing ages,and the RCM rapid chloride ion electromigration test was carried out.The results show that the diffusion coefficient of concrete decreased with the increase of curing age. By finite element software to simulate the diffusion of chloride ions,we concluded that the thickness of the protective layer with W/C 0.35,0.45 and 0.55 with a service life of100 years is 50 mm,55mm and 60 mm.

关 键 词：隧道衬砌 耐久性 氯盐侵蚀 保护层厚度 

分 类 号：TU745.3[建筑科学—建筑技术科学]