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Ageing models and maintenance strategy for road tunnels
Structure and Infrastructure Engineering ( IF 3.7 ) Pub Date : 2019-09-28 , DOI: 10.1080/15732479.2019.1670680
Xingbo Han 1, 2 , Yongxu Xia 1 , Fei Ye 1 , Yongdong Wang 1
Affiliation  

The ageing and deterioration of road tunnels due to environmental factors are inevitable. Rational and appropriate maintenance methods are required to maintain safety. This study aims to establish a maintenance strategy that determines the timing, location, and methods adopted to repair a degraded tunnel. Ageing models, which are key to maintenance strategy decision-making, are established with three failure modes—flexural capacity, convergence, and crack. Carbonation penetration from the inner surface of the lining, as well as chloride erosion from the outer surface of the lining, is considered in formulating the time-variant deterministic models for the three failure modes. Then, considering the uncertainties of the variables, statistical models of the structural response are obtained to calculate the probability characteristics. Also, the statistical model for the load effect is established based on the modified routine method. The probability of structural failure is determined based on the statistics of the structural response and the load effect models. Furthermore, a maintenance strategy is proposed at the system level with the performance-based maintenance method. Finally, an example is illustrated to demonstrate the application of the proposed method. The result shows that the standard deviation of the flexural capacity of the lining has similar time-variant characteristics as the means. The coefficient of vibration changes remains in a narrow interval during the ageing process. The tunnel lining crown and bottom have a higher probability of failure than other zones. Moreover, the failure probability of the positive moment zones is higher than that of the negative moment zones. The result can assist tunnel managers in developing a rehabilitation or replacement plan for the operation of tunnels.



中文翻译:

公路隧道老化模型及维护策略

由于环境因素,公路隧道的老化和退化是不可避免的。需要合理和适当的维护方法来维护安全。这项研究旨在建立一种维护策略,该策略可以确定修复退化隧道的时间,位置和方法。老化模型是维护策略决策的关键,它建立了三种失效模式:弯曲能力,收敛性和裂缝。在为三种破坏模式建立时变确定性模型时,应考虑从衬里内表面的碳化渗入以及衬里外表面的氯化物侵蚀。然后,考虑变量的不确定性,获得结构响应的统计模型以计算概率特征。也,基于改进的常规方法建立了荷载效应统计模型。结构破坏的可能性是根据结构响应和载荷效应模型的统计确定的。此外,使用基于性能的维护方法在系统级别上提出了一种维护策略。最后,通过一个例子说明了该方法的应用。结果表明,衬砌抗弯能力的标准偏差具有与均值相似的时变特性。在老化过程中,振动系数的变化保持在狭窄的区间内。隧道衬砌的顶部和底部比其他区域具有更高的失效概率。此外,正力矩区的失效概率高于负力矩区的失效概率。结果可以帮助隧道管理人员制定隧道运营的修复或更换计划。

更新日期:2020-03-24
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