铁道标准设计2026，Vol.70Issue(6)：118-125,144,9.DOI:10.13238/j.issn.1004-2954.202511190002
海水对隧道管片接缝橡胶密封可靠性的影响评估
Assessment of Seawater Influence on Reliability of Rubber Seals in Tunnel Segment Joints
摘要
Abstract
[Objective]To explore the performance evolution pattern and service reliability of ethylene propylene diene monomer(EPDM)gaskets used in segment joints of cross-sea shield tunnels in a complex seawater chemical environment.[Methods]Four kinds of salt compounds(NaCl,MgCl2,Na2 SO4,CaCl2)with the highest contents in seawater were selected as corrosive media,and laboratory accelerated aging tests were conducted at different temperatures(50,70,90℃).[Results]Based on the analysis of the degradation characteristics of rubber mechanical properties,the Anderson-Darling test criterion was introduced to determine the optimal degradation distribution function,and a reliability evaluation model for rubber gaskets was constructed by integrating the accelerated stress levels and the aging time.Furthermore,the reliability life of rubber under different salt environments was derived and compared.[Conclusion](1)Salt corrosion leads to hardening and embrittlement of rubber materials.Macroscopically,the hardness increases with exposure time,while the tensile strength and elongation at break decrease.Among these,the corrosive effect of Na2 SO4 solution is the most severe,with the maximum reduction in elongation at break reaching 12.4％during the test period,while the short-term corrosion rates of MgCl2 and NaCl are relatively low.(2)The Weibull distribution model is most suitable for describing the statistical characteristics of the degradation of rubber elongation at break.The reliability curve derived from this distribution reveals stage-specific differences in the effects of different salts on rubber life.(3)The degradation of rubber properties by Na2 SO4 is mainly manifested in the early service stage.When the reliability requirement is high(R=0.990),the onset time of degradation induced by Na2 SO4 occurs earliest.For engineering scenarios requiring long service life(corresponding to lower reliability thresholds),the long-term cumulative corrosion effects of MgCl2 and NaCl gradually dominate,and they are the key factors determining the long-term waterproof safety of the gaskets.关键词
盾构隧道/隧道密封垫/加速老化试验/三元乙丙橡胶(EPDM)材料/力学性能/可靠寿命Key words
shield tunnel/tunnel sealing gasket/accelerated aging test/ethylene propylene diene monomer(EPDM)material/mechanical properties/reliability life分类
交通工程引用本文复制引用
郑凯,石钰锋,朱彬彬,黄匀,朱昆,周宇航..海水对隧道管片接缝橡胶密封可靠性的影响评估[J].铁道标准设计,2026,70(6):118-125,144,9.基金项目
国家自然科学基金项目(52368053) （52368053）
国家重点研发计划项目(2023YFC3009401) （2023YFC3009401）
江西省自然科学基金项目(20242BAB26080) （20242BAB26080）
