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The impact of thermal–hydraulic variation on tunnel long-term performance: a tale of two tunnels
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Date
2024-09-28
Authors
Wang, Chao
Xiao, Zhipeng
Di Murro, Vanessa
Osborne, John
Friedman, Miles
Li, Zili
Journal Title
Journal ISSN
Volume Title
Publisher
ICE Publishing; ICE Publishing collections are provided by Emerald Publishing
Published Version
Abstract
Long-term structural performance of ageing tunnels is influenced by various natural and anthropogenic factors. This study examines the impacts of two rarely investigated climatic factors: rainfall and temperature. Two dedicated case studies were conducted on the European Organisation for Nuclear Research (CERN) TT10 tunnel and Dublin port tunnel (DPT) using distributed fibre optic strain sensing (DFOS) and wireless sensor network (WSN) monitoring, respectively. DFOS data showed an increasing deformation in TT10 tunnel, attributed to tunnel deteriorations and ground deformation, with seasonal variation of lining strains linked to rainfall-related seasonal change in pore water pressure. However, inconsistencies in the rainfall–strain correlation were also noted due to geological complexities and varying pore water pressure sources. In contrast, WSN measurements showed that DPT deformation correlated with temperature, instead of precipitation. DPT deformation increased in warmer seasons and decreased in colder ones, in the absence of external disturbances, comprising reversible thermal deformation and irreversible deterioration-induced deformation. Over time, cyclic and periodic temperature changes caused elastic deformation to reverse, while plastic deformation accumulated, leading to ongoing tunnel deformation. These findings bring more insights into the resilience of critical underground infrastructure vulnerable to climate change, groundwater variations and other environmental factors.
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Keywords
Temperature effect , Rainfall effect , Seasonable change , Long-term tunnel performance , Distributed fibre optic sensing , Wireless sensor network
Citation
Wang, C., Xiao, Z., Di Murro, V., Osborne, J., Friedman, M. and Li, Z. (2024) ‘The impact of thermal–hydraulic variation on tunnel long-term performance: a tale of two tunnels’, Géotechnique, pp. 1–17. Available at: https://doi.org/10.1680/jgeot.23.00074