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

• Main Authors: Lei Gao, Yuan Wang, Yangyang Sun, Qinghua Zhang, Zhenglin Zhang, Peng Zeng
• Format: Article
• Language: English
• Published: Wiley 2019-10-01
• Series: The Journal of Engineering
• Subjects: stress-strain relations; geotechnical engineering; soil; condition monitoring; bragg gratings; fibre optic sensors; geomorphology; mechanical stability; foundations; steel bar sensor; gravel soil slope; strain monitoring results; grating sensors; correct embedding fbg sensors; landslide early warning; fibre bragg grating monitoring; gravel soil landslide experiment; fibre bragg grating sensor; safety monitoring; landslide engineering; research stage; landslide process; gravel soil pile; tests fbg packaging; burying effect; sand pile landslide test; loading change
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2019.0777

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.