渗漏水对隧道管片接头氯离子侵蚀劣化的影响研究  

Study on the Effect of Leakage Water on Chloride Erosion Degradation in the Segment Joint

作　　者：孙齐[1,2,3] 刘四进 SUN QI;LIU Sijin(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031;PowerChina Huadong Engineering Corporation, Hangzhou 311122;Zhejiang Smart Rail Transit Engineering Research Center,Hangzhou 311225;China Railway 14th Bureau Group Co., Ltd, Ji′nan 250014)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031 [2]中国电建集团华东勘测设计研究院有限公司,杭州311122 [3]浙江省智慧轨道交通工程技术研究中心,杭州311225 [4]中铁十四局集团有限公司,济南250014

出　　处：《现代隧道技术》2019年第5期142-149,共8页Modern Tunnelling Technology

基　　金：国家重点研发计划（2016YFC0802201）;国家自然科学基金资助项目（51578462）;浙江省重点研发计划项目（2019C03111）

摘　　要：海底盾构隧道管片接头易发生渗漏水而加速衬砌结构侵蚀劣化。文章考虑管片内海水渗透、氯离子侵蚀及渗漏水等,建立了海底隧道管片接头渗漏-侵蚀数值计算模型,分析了不同外水压及不同接缝渗水量等工况下管片接头氯离子侵蚀运移规律及影响。结果表明:接缝渗漏水导致临近区域渗流场分布形态改变,孔隙水压增大,且外水压的影响作用大于渗水量;接缝渗漏水加重管片接头内侧混凝土侵蚀,外水压越大,其劣化增幅越明显,而渗水量大小的影响可忽略不计;外水压的增大提高了钢筋表面离子含量,使得离子分布不均匀性减小,缩短了钢筋达到临界离子浓度时间,仅外水压较小时渗水量增大可提高同一时间内钢筋表面离子含量;渗漏水状态下,离子运移轨迹向接缝面靠拢,渗水量越大,接缝处离子运移曲线轨迹越密集。Water leakage is more likely to occur at the segment joint of subsea shield tunnel and consequently it will accelerate the erosion and deterioration rate of the lining structure. A numerical model for the seepage erosion of segment joint of the subsea tunnel was established considering the penetration of sea water, erosion of chloride ion and water leakage. The migration law and effect of chloride ion erosion were analyzed under different external water pressures and volumes of water seepage. The results show that water leakage results in change of distribution pattern of seepage field in the adjacent area and increase of pore water pressure;water seepage aggravates the erosion of concrete at the inner side of segment, the larger the external water pressure, the more obvious the increase of deterioration, while the effect of water seepage volume can be ignored;the increase of external water pressure will increase the ion content on the surface of steel bar, reduce the inhomogeneity of ion distribution, and shorten the time to reach the critical ion concentration of steel bar, and the ion content of the steel bar surface increases with an in? crease of water seepage at the same time under small external water pressure;in the case of water seepage, the icon migration moves toward joint surface, the larger the water seepage, the more concentrating of moving track of icon.

关 键 词：盾构隧道 管片接头 渗漏水 氯离子侵蚀 钢筋腐蚀 离子运移 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]