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Fiber Bragg grating sensor-based monitoring strategy for slope deformation in centrifugal model test

Yongxing Guo (Hunan Provincial Key Laboratory of Hydropower Development Key Technology, Changsha, China and Key Laboratory of Metallurgical Equipment and Control Technology, Ministry of Education, Wuhan University of Science and Technology, Wuhan, China)
Jianjun Fu (Hunan Provincial Key Laboratory of Hydropower Development Key Technology, Changsha, China)
Longqi Li (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China)
Li Xiong (Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan, China)

Sensor Review

ISSN: 0260-2288

Article publication date: 17 April 2018

Issue publication date: 24 January 2019

215

Abstract

Purpose

Centrifugal model tests can accelerate the characterization of landslides and demonstrate the form of slope failure, which is an important measure to research its instability mechanisms. Simply observing the slope landslide before and after a centrifugal model test cannot reveal the processes involved in real-time deformation. Electromagnetic sensors have severed as an existing method for real-time measurement, however, this approach has significant challenges, including poor signal quality, interference, and complex implementation and wiring schemes. This paper aims to overcome the shortcomings of the existing measurement methods.

Design/methodology/approach

This work uses the advantages of fiber Bragg grating (FBG) sensors with their small form-factor and potential for series multiplexing in a single fiber to demonstrate a monitoring strategy for model centrifugal tests. A slope surface deformation displacement sensor, FBG anchor sensor and FBG anti-slide piling sensor have been designed. These sensors are installed in the slope models, while centrifugal acceleration tests under 100 g are carried out.

Findings

FBG sensors obtain three types of deformation information, demonstrating the feasibility and validity of this measurement strategy.

Originality/value

The experimental results provide important details about instability mechanisms of a slope, which has great significance in research on slope model monitoring techniques and slope stability.

Keywords

Acknowledgements

This work was supported by the Open research fund of Hunan Provincial Key Laboratory of Hydropower Development Key Technology under Grant No. PKLHD201605, the National Natural Science Foundation of China under Grant No. 51605348, the Natural Science Foundation of Hubei province under Grant No. 2016CFB116 and the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project under Grant No. SKLGP2016Z007.

Citation

Guo, Y., Fu, J., Li, L. and Xiong, L. (2019), "Fiber Bragg grating sensor-based monitoring strategy for slope deformation in centrifugal model test", Sensor Review, Vol. 39 No. 1, pp. 71-77. https://doi.org/10.1108/SR-10-2017-0218

Publisher

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Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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