【研究背景】
社会性话题与问题引出：在长距离输水盾构隧洞的运营中，高水压可能会导致复合衬砌过度变形，影响其结构完整性和使用性能。然而，关于内部水压下衬砌结构的变形和破坏特性，在文献中尤其是针对三层复合衬砌的研究还不充分。本研究通过现场足尺实验，研究了两类复合衬砌（即分离和组合衬砌结构）在内部压力作用下的结构响应，采用了配备分布式应变和位移传感器的光纤神经系统（FONS）对两类复合衬砌的力学性能进行监测。
【研究内容】
问题、方法和结论：实验结果清楚地显示，不同内部压力下隧道衬砌的损伤主要出现在自密实混凝土层。分离衬砌结构对内部压力变化的响应比组合衬砌更为激烈。本文提出了两个评估指标，即径向位移和有效刚度系数，用于描述结构承载性能的变化。在试验中，两类衬砌结构的有效刚度系数分别降低了39.4%和29.5%。考虑到现场监测的便利性，建议使用不同层的平均应变作为表征衬砌结构健康状况的特征参数。分析结果为输水盾构隧洞复合衬砌的设计和健康评估提供了实用参考。
【研究意义】
创新点：本研究通过光纤传感技术对输水盾构隧洞的复合衬砌进行了全面的性能评估，填补了关于内部水压下复合衬砌结构变形和破坏特性的研究空白。提出的评估指标和特征参数为隧洞设计和健康评估提供了实用的参考，可以帮助提高隧洞结构的安全性和可靠性。这项研究可以帮助相关从业人员了解输水隧洞工程中的问题和挑战，以及如何通过科学研究来解决这些问题。同时，介绍了光纤传感技术在工程实践中的应用，有助于促进这一技术在工程中的推广应用。
Fiber optic sensing and performance evaluation of a water conveyance tunnel with composite linings under super-high internal pressures
来源：Journal of Rock Mechanics and Geotechnical Engineering
作者：Wang D.; Zhu H.; Huang J.; Yan Z.; Zheng X.; Shi B.
出版时间：2023-01-01
DOI：10.1016/j.jrmge.2023.02.026
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