TY - JOUR
T1 - The impact of thermal-hydraulic variation on tunnel long-term performance
T2 - a tale of two tunnels
AU - Wang, Chao
AU - Xiao, Zhipeng
AU - Di Murro, Vanessa
AU - Osborne, John
AU - Friedman, Miles
AU - Li, Zili
N1 - Publisher Copyright:
© 2025 Emerald Publishing Limited: All rights reserved.
PY - 2025/6/19
Y1 - 2025/6/19
N2 - 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.
AB - 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.
KW - distributed fibre optic sensing
KW - field testing & monitoring
KW - long-term tunnel performance
KW - rainfall effect
KW - seasonal change
KW - temperature effects
KW - tunnels & tunnelling
KW - wireless sensor network
UR - https://www.scopus.com/pages/publications/85201154293
U2 - 10.1680/jgeot.23.00074
DO - 10.1680/jgeot.23.00074
M3 - Article
AN - SCOPUS:85201154293
SN - 0016-8505
VL - 75
SP - 858
EP - 874
JO - Geotechnique
JF - Geotechnique
IS - 7
ER -
