Integrated distributed fiber optic sensing technology-based structural monitoring of the pound lock

Song, Zhanpu; Zhang, Dan; Shi, Bin; Chen, Shen-En; Shen, Mengfen

doi:10.1002/stc.1954

Cited by 22 publications

(21 citation statements)

References 26 publications

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“…Nevertheless, these studies have significantly contributed to an understanding of subgrade deformation properties and processes and could be quite promising approaches if applied under actual field conditions using advanced monitoring devices of high accuracy. In recent years, sensors based on fiber Bragg gratings (FBGs) have been applied widely [15][16][17][18][19][20][21] since they were first introduced by Hill et al 22 owing to their numerous advantages such as high sensitivity, lightweight, corrosion resistance, low optical loss, and resistance to electromagnetic interference, with real-time and remote monitoring capabilities. 23,24 This study presents the development of an implanted cantilever sensing beam based on FBGs for subgrade deformation monitoring.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

Meng

Sun

Wang

2019

Struct Control Health Monit

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Summary Excessive subgrade permanent deformation resulting from heavy vehicle traffic and freezing–thawing cycles is one of the primary causes of road damage in seasonally frozen regions. In this paper, an implanted cantilever sensing beam based on fiber Bragg gratings (FBGs) is proposed for subgrade deformation monitoring. Two optical fibers with inscribed FBGs were adhered to the opposite external sides of a PVC pipe which was selected as substrate. After laboratory calibration tests, the cantilever sensing beam was installed horizontally through the subgrade of a testing section. The beam will be bended driven by the deformation of the soils under the action of vehicles, and the deformation is recorded by the FBGs and calculated through principles of continuum mechanics. The subgrade deformation is considered to be the deflection of the sensing beam. The feasibility of the developed method was validated based on the results of field testing conducted for a three‐year period. It has been found that the combination of freezing–thawing cycles with heavy vehicle loading magnifies the extent of permanent subgrade deformation. The developed FBG‐based implanted cantilever sensing beams are thereby demonstrated to provide a feasible and effective approach for the in situ monitoring of subgrade deformation.

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Section: Introductionmentioning

confidence: 99%

Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

Meng

Sun

Wang

2019

Struct Control Health Monit

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“…Brillouin scattering‐based distributed fiber optic technology has advanced rapidly over the last decade and have been applied successfully to the health monitoring of geotechnical structures including tunnels, pound locks, and slopes . The distributed and real‐time distance‐monitoring features of this method are ideal for capturing the working conditions of a linear structure such as tunnels.…”

Section: Introductionmentioning

confidence: 99%

“…The distributed and real‐time distance‐monitoring features of this method are ideal for capturing the working conditions of a linear structure such as tunnels. Currently, the most popular distributed optic fiber sensing technology in the field of tunnel health monitoring involves Brillouin optical time domain reflectometry (BOTDR) and Brillouin optical time domain analysis (BOTDA), which have been widely used around the world . Kazuhiko Fujihashi et al described an actual applied system for monitoring tunnel changes, including tunnel sectional displacement and tunnel longitudinal strain .…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the most popular distributed optic fiber sensing technology in the field of tunnel health monitoring involves Brillouin optical time domain reflectometry (BOTDR) and Brillouin optical time domain analysis (BOTDA), which have been widely used around the world. [8][9][10][11][12] Kazuhiko Fujihashi et al described an actual applied system for monitoring tunnel changes, including tunnel sectional displacement and tunnel longitudinal strain. [13] Hiroshi Naruse et al presented a telecommunications tunnel monitoring system that was developed to detect tunnel damage using BOTDR in practice.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring the behavior of segment joints in a shield tunnel using distributed fiber optic sensors

Wang

Shi

Wei³

et al. 2017

Struct Control Health Monit

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SummaryShield tunneling is a popular tunnel construction technique for its efficiency and speed. However, uncertainties associated with site soil conditions, past loading histories and analytical modeling, can result in performance issues. To monitor shield tunnels and ensure performance and safety, fiber optic sensing technique is proposed. Based on Brillouin optical frequency domain analysis, the technique can monitor the opening and closing of segmental joints in shield tunnels with high sensitivity. To determine tunnel lining segment displacement, different fixed-point spacings have been tested in the lab. The test results show that the difference in fixed-point distances had no impact on the test accuracy and the sensing cable with 0.9-mm polyurethane sheath coater has the best performance. For demonstration, the Brillouin optical frequency domain analysis-based monitoring technique is applied to the Suzhou Metro Line 1 tunnel for tunnel lining segment joint monitoring. The technique detected minor deformation of the segment joints in tunnels in operation and located leakages within the tunnel. The technique further identified that the minor deformations of the segment joints and track bed expansion were closely associated with temperature variations.

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“…Abbiati et al [6] proposed a prototype of an optical fibre sensor for monitoring civil engineering structures particularly steel structures to detect local bending of monitored structures. Song et al [13] proposed an integrated distributed fibre optic sensing technology which includes Raman optical time-domain reflectometry, Brillouin optical time-domain analysis, and fibre Bragg grating sensing technology to monitor the temperature and variation of stress/strain of a pound lock reinforced concrete structure during the construction process. Wong et al [9] successfully utilized distributed optical fibre sensors to monitor the damage growth in a pipeline subjected to transient hydraulic pressures.The optical fibre sensing (OFS) techniques appeared to be maturing, and a number of field applications were implemented successfully [14].…”

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confidence: 99%

Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre

Yuen

Tsai

Deb

et al. 2019

Sensors

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Rapid identification of structural damage positions is essential to the post-disaster rehabilitation of structures and infrastructures. Large shear deformation, e.g., shear failure of bridge piers, shear-slip of slopes, and shear cracking of structural walls, is often the cause of structural instability. Distributed optical fibre sensing (DOFS) techniques have an advantage over point-based sensors in terms of spatial continuous structural condition monitoring. This paper presents the development of new measurement theory and algorithm to evaluate the structural shear deflection based on the large beam deflection and optical bend loss theories. The proposed technique adopted a photon-counting Optical Time Domain Reflectometer (ν-OTDR) with polymer optical fibres (POFs) which has a large deformation measurement range and high spatial resolution. In the experiment, shear deformation events can be successfully detected and evaluated from the proposed technique. When the normalised shear deformation is larger than 0.2, both the event locations and the magnitudes can be accurately determined. When normalised shear deformation is lesser than 0.2, the error in the magnitude evaluation increased, but the event location can be found with an absolute error <0.5 m. Multiple shear events can be treated as independent events when they are separated by more than 5 m. Various configurations of POFs attached to concrete beam specimens for rupture failure monitoring were also studied. The configuration that could maximise the POF curvature at the beam failure produced the largest ν-OTDR signals. In other configurations in which the POFs were only stretched at failure, the signals were less strong and were influenced by the POF-structure bonding strength.Sensors play a crucial role in detecting the health of the structure and accessing the probable damage or collapse. Over the past few decades, studies on optical fibre have started, consequently leading to the proposal of various ideas and techniques for structural health monitoring and damage detection [3][4][5][6][7][8][9][10][11]. Innovative distributed optical fibre sensors (DOFS) [9,12] are used over classical strain gauges to monitor the structural damage and preferred as a better alternatives because of the following reasons: (a) strain gauges are point sensors whereas DOFSs are continuous sensors along the entire length; (b) deployment of strain gauges requires the prior knowledge of expected damage locations; (c) installation of miniature strain gauges involves cumbersome gluing and wire welding processes; and (d) each strain gauge is connected to a pair of cables, and it can be quite disordered if a large number of strain gauges are required.Habel and Bismarck [5] recommended the use of highly resolvable bare and plasma-polymer coated fibre sensors in concrete environment. These sensors could reliably measure the micro-deformation behaviour of special grouts. Abbiati et al. [6] proposed a prototype of an optical fibre sensor for monitoring civil engineering structures par...

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Integrated distributed fiber optic sensing technology-based structural monitoring of the pound lock

Cited by 22 publications

References 26 publications

Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

Monitoring the behavior of segment joints in a shield tunnel using distributed fiber optic sensors

Large Structural Shear Deformation and Failure Monitoring Using Bend Losses in Polymer Optical Fibre

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