跨海地铁盾构管片混凝土耐久性及寿命预测分析  

Analysis of concrete durability and life prediction of shield segment in cross-sea metro

作　　者：王金龙[1] 刘伟宝[2] 杨虎[2] 陆采荣[2] WANG Jinlong;LIU Weibao;YANG Hu;LU Cairong(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;State Key Lab of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210029

出　　处：《海洋工程》2022年第5期139-146,共8页The Ocean Engineering

基　　金：厦门市科技计划项目“跨海地铁建设与运营期结构安全保障关键技术”(3502Z20151006)。

摘　　要：根据某跨海地铁2号线的工况,确定跨海区间盾构管片的环境类别和作用等级,由各原材料氯离子含量计算推荐配合比混凝土氯离子含量,并对推荐配合比混凝土开展氯离子扩散系数试验和抗压强度试验。分别使用《海港工程高性能混凝土质量控制标准》(JTS 257-2—2012)、《混凝土结构耐久性评定标准》(CECS 220:2007)中的评定方法及多因素耦合评价(MFC)方法,基于钢筋开始锈蚀阶段t_(i)、混凝土保护层锈胀开裂阶段t_(c)、混凝土功能明显退化阶段t_(d)对混凝土结构使用年限t_(e)进行预测。结果表明,以上3种耐久性预测模型预测跨海地铁2号线推荐配合比使用年限的计算结果均大于100年,能够满足使用100年的要求。According to the working condition of Xiamen Metro Line 2,the environmental category and action grade of the shield segment in transoceanic section were determined.The chloride ion content of the recommended mix concrete was calculated from the chloride ion content of each raw material,and the chloride ion diffusion coefficient test and the compressive strength test were carried out for the recommended mix concrete.Based on the initial corrosion stage of steel bar t_(i),the stage of rust expansion and cracking of concrete cover t_(c),and the stage of obvious deterioration of concrete function t_(d),the service life of concrete structure t_(e) was predicted.The assessment methods in the Quality control standard for high performance concrete in harbour engineering(JTS 257-2—2012),the Assessment standard for durability of concrete structures(CECS 220:2007)and the multi-factor coupled evaluation(MFC)method were used respectively.The results show that the service life of recommended mix proportion of Xiamen Metro Line 2 is greater than 100 years,which can meet the requirements of 100 years.

关 键 词：轨道交通 盾构管片 跨海区间 混凝土 寿命预测 耐久性 配合比 氯离子 

分 类 号：P755.3[天文地球—海洋科学]