Review of fiber optic sensors in geotechnical health monitoring

Zheng, Yong; Zhu, Zhengwang; Xiao, Wang; Deng, Quan-Xiang

doi:10.1016/j.yofte.2019.102127

Cited by 60 publications

(21 citation statements)

References 67 publications

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“…The first patents focused on the preparation and application of OFS appeared in the 1960s [1]. Since then, the developments in this particular area have been quite noteworthy [2][3][4][5][6]. The progress achieved is mainly related to the use of optical fibers by the telecommunications companies whose investigation and development made it possible to manufacture high quality fibers with a low production cost [1].…”

Section: Fundamentalsmentioning

confidence: 99%

“…Concrete degradation is a complex process that results from physical and chemical reactions between concrete components and their surrounding environment. The corrosion of steel in reinforced concrete structures (RCS) has been widely studied and reported by several authors [1][2][3][4][5][6][7], since its premature degradation often results in expensive costs of repair, maintenance, and rehabilitation. To mitigate corrosion in RCS and improve their service life, different approaches-destructive and non-destructive methods-have been developed with the aim of monitoring both existing and new structures.…”

Section: Introductionmentioning

confidence: 99%

“…The pH of concrete is influenced by the CO 2 and depends on the humidity and the temperature that, in specific conditions, may accelerate the entire process. Cl − can penetrate the passive layer and when they exceed the chloride threshold value (CTV), the steel depassivation process begins, leading to the corrosion of reinforcing bars [4,14]. In 2007, Song et al [14] determined this critical value to be equal to 1.2 kg m -3 .…”

Section: Introductionmentioning

confidence: 99%

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Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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The use of advanced sensing devices for concrete and reinforced concrete structures (RCS) is considered a rational approach for the assessment of repair options and scheduling of inspection and maintenance strategies. The immediate benefits are cost reduction and a reliable prevention of unpredictable events. The use of optical fiber sensors (OFS) for such purposes has increased considerably in the last few years due to their intrinsic advantages. In most of the OFS, the chemical transducer consists of immobilized chemical reagents placed in the sensing region of the optical sensor by direct deposition or by encapsulation in a polymeric matrix. The choice of the support matrix impacts directly on the performance of the OFS. In the last two decades, the development of OFS functionalized with organic–inorganic hybrid (OIH) sol–gel membranes have been reported. Sol–gel route is considered a simple method that offers several advantages when compared to traditional synthesis processes, allowing to obtain versatile materials with unique chemical and physical properties, and is particularly valuable in the design of OIH materials. This review will provide an update of the current state-of-the-art of the OFS based on OIH sol-gel materials for concrete and RCS since 2016 until mid-2021. The main achievements in the synthesis of OIH membranes for deposition on OFS will be discussed. The challenges and future directions in this field will also be considered, as well as the main limitations of OFS for RCS monitoring.

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Section: Fundamentalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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“…In other geotechnical engineering real-time monitoring fields, many scholars have used fiber optic sensors (FOS)s based on bending loss and Fiber Bragg Grating (FBG)-based FOSs to monitor structural cracks, landslides, surface subsidence, soil nails and anchors strain, pipes and pipelines strain, etc. [32,33]. The FOSs based on bending loss have relatively lower sensitivities in wide measurement ranges, but are simple to construct and low cost, without any special fibers or complex assembly.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Monitoring Method for Layered Compaction Quality of Loess Subgrade Based on Hydraulic Compactor Reinforcement

Zhou

Yan

et al. 2020

Sensors

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Hydraulic compactor is an efficient reinforcement machine for loess subgrade. However, it is difficult to control the layered compaction quality of the subgrade. This research presents a real-time layered compactness monitoring method for hydraulic compactor reinforcement of subgrade in loess areas. The hydraulic force coefficient is first introduced, and the dynamic response model of the hydraulic rammer and soil is established. The relationship between the acceleration of the hydraulic rammer and the compactness of subgrade is then obtained based on the collision theory in elastic half space. A full-scale test using a hydraulic compactor to reinforce loess subgrade was also carried out. Results show that the hydraulic compactor obtains the effective influence depth for the reinforcement of loess subgrade. Within the effective reinforcement depth, the relationship between the peak acceleration of the rammer and the layered compactness of subgrade can be well fitted by a quadratic function model. The layered compactness of the subgrade and the working state of the hydraulic compactor can then be remotely monitored at a mobile terminal in real time. Furthermore, the monitoring technology was applied to Huangling-Yan’an Expressway in China, significantly improving the accuracy and efficiency of real-time monitoring of the layered compactness of subgrade in the loess area.

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“…It should be emphasized that the sealing performance at the joints can affect the structural integrity of prefabricated utility tunnel to a significant extent [9], since leakage is most likely to occur through those weak spots. On-site monitoring can be employed to obtain the deformation and damage results on the internal structure surface, mainly, by laying sensors for strain measurement and/or image analysis equipment [10]. Model-scale laboratory sealing test is often carried out on a utility tunnel under internal pressures in a stepwise manner [11].…”

Section: Introductionmentioning

confidence: 99%

Time Series Analysis of Acoustic Emissions in Prefabricated Utility Tunnel During the Sealing Test

Lin

Deng

et al. 2020

Int. J. of Geosynth. and Ground Eng.

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Utility tunnel is increasingly applied for underground space development, and its health monitoring becomes attractively important. The acoustic emission (AE) technology is often used for damage monitoring of small-scale specimens made of concrete or rock in the laboratory. In this study, the AE technology is adopted to instrument a novel prefabricated utility tunnel to provide insights into the leakage behavior of the structure during the sealing test. Filtering is conducted on AE data to eliminate the influence of noise interference, especially for data in the pressurization stage. The traditional ring-down count and AE energy are determined from eigenvalue analysis of AE events. It is found that these conventional calculations can be well related to the pattern of internal water pressure, and the Felicity effect is found in the loading process. Furthermore, time series analysis is carried out for each specific pressurization or pressure-holding stage during the sealing test, in which the b-value (an important mean to study the characteristics of AE signal) is evaluated. Results show that the b-value can also be used as a prediction basis for pre-alarming monitoring before the occurrence of seepage failure for utility tunnel.

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Review of fiber optic sensors in geotechnical health monitoring

Cited by 60 publications

References 67 publications

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Real-Time Monitoring Method for Layered Compaction Quality of Loess Subgrade Based on Hydraulic Compactor Reinforcement

Time Series Analysis of Acoustic Emissions in Prefabricated Utility Tunnel During the Sealing Test

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