A Tale of Two Tunnels—Understanding the Performance of Existing and New Tunnels during Construction Works

Elshafie, Mohammed; Gue, Chang Ye; Battista, Nicholas de; Alhaddad, MM; Wilcock, M; Soga, K; Mair, RJ

doi:10.12783/shm2015/197

Cited by 1 publication

(1 citation statement)

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“…The sensor locations were determined by reference to similar sewage collector and tunnel monitoring systems, including those performed in 2016 as a part of the Grand Paris Express [ 9 ] project and currently being implemented for the entire investment, which is expected to be completed in 2030 [ 10 ]. Four loops in the most weakened part of the collector section were implemented in a manner similar to the design of the system used in the Royal Mail Underground Tunnel in London [ 11 ]. Experiences of other researchers have proven the robustness of fiber-optic sensors for structural monitoring under difficult conditions in cross-sections of tunnels [ 12 ].…”

Section: Dfos-based Structural Health Monitoring Systemmentioning

confidence: 99%

Monitoring of Large Diameter Sewage Collector Strengthened with Glass-Fiber Reinforced Plastic (GRP) Panels by Means of Distributed Fiber Optic Sensors (DFOS)

Popielski

Bednarz

Sieńko

et al. 2021

Sensors

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Diagnostics and assessment of the structural performance of collectors and tunnels require multi-criteria as well as comprehensive analyses for improving the safety based on acquired measurement data. This paper presents the basic goals for a structural health monitoring system designed based on distributed fiber optic sensors (DFOS). The issue of selecting appropriate sensors enabling correct strain transfer is discussed hereafter, indicating both limitations of layered cables and advantages of sensors with monolithic cross-section design in terms of reliable measurements. The sensor’s design determines the operation of the entire monitoring system and the usefulness of the acquired data for the engineering interpretation. The measurements and results obtained due to monolithic DFOS sensors are described hereafter on the example of real engineering structure—the Burakowski concrete collector in Warsaw during its strengthening with glass-fiber reinforced plastic (GRP) panels.

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Section: Dfos-based Structural Health Monitoring Systemmentioning

confidence: 99%