Abstract
The long-term structural performance of underground structures in reclamation areas is very sensitive to the vibrations caused by vehicles passing above the structures and environmental factors (e.g., tide levels, rainfall and temperature). In the present study, an integrated remote real-time structural health monitoring system using fiber Bragg grating sensors was developed to assess the structural performance of underground structures. Using a composite road box-type structure project in a reclamation area in Southern China as a case study, the developed real-time system was implemented to investigate the effects of changes in tide levels, rainfall, temperature and vehicle induced vibrations on crack propagation in the structure. The results show that the change in tide levels has little influence on the change in crack width in the structure, whereas variations in temperature could significantly influence the crack width with an average Pearson correlation of around 0.8. In addition, the crack width generally decreases with an increase in rainfall. Furthermore, a relatively low frequency (<25 Hz) induced by the traffic could result in a relatively larger crack width.
Highlights
The structural health of underground road structures in reclamation areas is affected by the vibrations induced by vehicles and the deterioration rate of construction materials, which is influenced by a range of environmental factors such as tide levels, rainfall and temperature throughout the year [1,2]
To identify the critical factors that affect the structural condition of underground structures, Bossi et al [15] analyzed the influence of landslides on crack development in tunnels, while Qin et al [16] studied the effects of continuous rainfall on the surrounding rock deformation in shallow-buried highway tunnels
The structural performance of the underground structures needs to be closely monitored during this period
Summary
The structural health of underground road structures in reclamation areas is affected by the vibrations induced by vehicles and the deterioration rate of construction materials, which is influenced by a range of environmental factors such as tide levels, rainfall and temperature throughout the year [1,2]. To identify the critical factors that affect the structural condition of underground structures, Bossi et al [15] analyzed the influence of landslides on crack development in tunnels, while Qin et al [16] studied the effects of continuous rainfall on the surrounding rock deformation in shallow-buried highway tunnels. With a sampling frequency of 1000 Hz, fiber Bragg grating sensing monitoring technology has the capability to monitor multiple critical factors that affect the structural conditions of underground structures simultaneously through continuous long-term data collection. An integrated remote real-time SHM system, including a remote real-time monitoring system and a developed data processing model, was developed to conduct condition assessment of composite road box-type structures in reclamation areas using fiber Bragg grating sensing monitoring technology by encapsulating the FBG sensors with stainless steel and adhesives. Taking a composite road box-type structure project in a reclamation area in Southern China as a case study, the developed system was implemented to investigate the effects of the change in tides, rainfalls, temperature and vehicle induced vibrations on the degradation of the structure simultaneously
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