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access icon openaccess Research on fibre Bragg grating monitoring in the gravel soil landslide experiment

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 28/02/2019, Accepted 28/02/2019, Published 25/03/2019

Fibre Bragg Grating (FBG) sensor is a new sensor with numerous advantages. How to apply in the safety monitoring of landslide engineering is still in experiment and research stage. Here, FBG is used to monitor the landslide process of the gravel soil pile. Before monitoring experiment, the article first tests FBG packaging and burying effect by two tests in lab, one is sand pile landslide test which proves vertical buried is feasible and the other is loading test on the steel bar sensor which proves the wavelength change of FBG on steel bar sensor has a good linear relationship with the loading change. Then, buried the steel bar sensor in the gravel soil slope after simple encapsulation. Stress and strain monitoring results of grating sensors are obtained in landslide which is formed through the simulation of excavation construction. The experimental data show that through correct embedding FBG sensors can effectively monitor the stress–strain change of the slope. FBG provides a new way for the landslide early warning.

Inspec keywords: soil; stress-strain relations; geomorphology; fibre optic sensors; geotechnical engineering; foundations; mechanical stability; condition monitoring; Bragg gratings

Other keywords: research stage; correct embedding FBG sensors; fibre Bragg grating monitoring; tests FBG packaging; gravel soil landslide experiment; grating sensors; steel bar sensor; safety monitoring; burying effect; gravel soil pile; landslide early warning; sand pile landslide test; loading change; gravel soil slope; landslide process; strain monitoring results; Fibre Bragg Grating sensor; landslide engineering

Subjects: Geotechnical structures; Numerical analysis; Engineering materials; Fibre optics; Fibre optic sensors; fibre gyros; Testing; Gratings, echelles; Construction industry; Fibre optic sensors

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