A new flexible FBG sensing beam for measuring dynamic lateral displacements of soil in a shaking table test

Xu, Dongsheng; Yin, Jianhua; Cao, Zhenzhong; Wang, Yunlong; Zhu, Hong‐Hu; Pei, Huafu

doi:10.1016/j.measurement.2012.06.007

Cited by 44 publications

(11 citation statements)

References 14 publications

(14 reference statements)

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“…The FBG sensor has inherent merits as compared with traditional electrical sensors, such as light weight and resistance to electromagnetic interference and corrosion (Measures, 2001). A great progress has been made in the engineering applications with FBG sensors (Kersey et al, 1997;Xu et al, 2013Xu et al, , 2014. For example, a significant achievement in Europe was through the first major program named the BRITE-EURAM II project in order to demonstrate optical fiber sensors used for strain and temperature sensing in real structures.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Development of a fiber Bragg grating sensing beam for internal deformation measurement in asphalt pavement

Luo

Liu

2017

Advances in Structural Engineering

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The measurement of internal deformation of asphalt pavement is essential for transportation network maintenance, from which the early stage fatigue of asphalt pavement can be detected and then retrofitted. However, existing transducers could only measure either point strains inside the asphalt pavement or the deformation at the surface. To fill this gap, a fiber Bragg grating sensing beam is developed, which can measure the internal deformation of the asphalt pavement under traffic loads. The design principles and working mechanism of the fiber Bragg grating sensing beam are presented in detail. A prototype of the fiber Bragg grating sensing beam was fabricated in the laboratory, and its measurement resolution and maximum deflection, as determined through a calibration test, are 0.29 mm/me and 87.1 mm, respectively. A physical model test established in the laboratory indicated that the fiber Bragg grating sensing beam has a good performance and thus can be used to measure internal deformation of the asphalt pavement.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Development of a fiber Bragg grating sensing beam for internal deformation measurement in asphalt pavement

Luo

Liu

2017

Advances in Structural Engineering

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“…In Europe, Habel et al used a similar approach to monitor a sliding coal pit slope [21]. In a shaking table test, Xu et al employed the same method to calculate the lateral displacements of a small bar buried in soil [51]. The shortcomings of this inclinometer are that the boundary conditions have to be correctly specified and the measuring errors will accumulate during numerical integrations.…”

Section: Development Of Fbg-based Geohazard Monitoring Systemsmentioning

confidence: 99%

FBG-Based Monitoring of Geohazards: Current Status and Trends

Zhu

Shi

Zhang

2017

Sensors

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110

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In recent years, natural and anthropogenic geohazards have occured frequently all over the world, and field monitoring is becoming an increasingly important task to mitigate these risks. However, conventional geotechnical instrumentations for monitoring geohazards have a number of weaknesses, such as low accuracy, poor durability, and high sensitivity to environmental interferences. In this aspect, fiber Bragg grating (FBG), as a popular fiber optic sensing technology, has gained an explosive amount of attention. Based on this technology, quasi-distributed sensing systems have been established to perform real-time monitoring and early warning of landslides, debris flows, land subsidence, earth fissures and so on. In this paper, the recent research and development activities of applying FBG systems to monitor different types of geohazards, especially those triggered by human activities, are critically reviewed. The working principles of newly developed FBG sensors are briefly introduced, and their features are summarized. This is followed by a discussion of recent case studies and lessons learned, and some critical problems associated with field implementation of FBG-based monitoring systems. Finally the challenges and future trends in this research area are presented.

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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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A new flexible FBG sensing beam for measuring dynamic lateral displacements of soil in a shaking table test

Cited by 44 publications

References 14 publications

RETRACTED: Development of a fiber Bragg grating sensing beam for internal deformation measurement in asphalt pavement

RETRACTED: Development of a fiber Bragg grating sensing beam for internal deformation measurement in asphalt pavement

FBG-Based Monitoring of Geohazards: Current Status and Trends

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

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