为揭示外水压与周围腐蚀离子环境长期耦合作用下盾构隧道衬砌结构侵蚀劣化机理,对压力渗透下管片混凝土多孔介质渗透深度与离子侵蚀运移进行理论解析,建立管片接头离子侵蚀对流-弥散运移数值模型,在一维渗流状态下验证了考虑压力渗透作用的腐蚀离子侵蚀理论的合理性,并建立可考虑压力渗透、离子对流-弥散运移以及管片接头非连续的盾构隧道衬砌结构离子侵蚀数值模型,重点分析了整环管片衬砌结构侵蚀劣化规律。结果表明:水压力的存在对海水渗透具有促进作用,外水压力越大,对海水渗透效果越显著;外水压力的增大将导致氯离子含量的增加,外水压力越大,同一位置累积到相同离子浓度所需的累积时间越短;管片接头处离子含量分布具有局部集中的特点,整环管片衬砌结构离子侵蚀大小关系为拱顶<拱腰<拱底;服役初期仅管片接头附近外排钢筋出现锈蚀,而后出现外排钢筋整体性锈蚀,体现出不均匀锈蚀的特点,且随着服役时间的延长,外排钢筋不均匀锈蚀差异减小。 In order to reveal the erosion and deterioration mechanism of shield tunnel lining under long-term coupling of external water pressure and surrounding corrosive ionospheric environment, theoretical analysis is made on the penetration depth and ion erosion of porous media under pressure infiltration, and the ion erosion convection - A numerical model of dispersion transport, the rationality of corroded ion erosion considering pressure infiltration is validated in one-dimensional seepage condition, and a shield that can consider pressure infiltration, ion convection-diffusive transport and discontinuous segment joints is established Tunnel lining structure ion erosion numerical model, focusing on analysis of the whole ring segment lining structure erosion deterioration. The results show that the existence of water pressure can promote the infiltration of seawater. The larger the external water pressure is, the more obvious it is to infiltrate the seawater. The increase of external water pressure will lead to the increase of chloride ion content. The larger the external water pressure, the same place accumulates The shorter the cumulative time required for the same ion concentration; the ion content distribution at the pipe joint has a local concentration; the ion erosion of the entire ring segment lining structure is in relation to the arch