Theoretical and experimental study on fiber Bragg grating sensing of rock strata settlement deformation

• Published in: Journal of coal science & engineering, China Vol. 14; no. 3; pp. 394 - 398
• Main Author: 刘金瑄 柴敬 魏世明 李毅 朱磊 邱标
• Format: Journal Article
• Language: English
• Published: Heidelberg China Coal Society 01.09.2008
• Subjects: Earth and Environmental Science; Earth Sciences; Geochemistry; Geology; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Mechanical Engineering; 光纤敏感器; 材料模式; 煤炭开采; 监测系统; fiber grating sensor; monitoring; material model
• ISSN: 1006-9097; 1866-6566
• DOI: 10.1007/s12404-008-0087-0

Based on the theory of fiber Bragg grating sensing, and using a 2 m plane stress material model of the simulation experiment, the wavelength shift regulations of fiber Bragg gratings under rock settlement deformation conditions were got, which provided reliable basis for the design of the wavelength bandwidth of sensing gratings. The wavelength increase when the rock layers are Compressive strain sensitivity is bigger under tension, and decrease under compression. than tensile strain sensitivity when the load is lower. However compressive strain sensitivity is smaller than tensile strain sensitivity when the load is higher. Experimental result coincides well with theory. The wavelength bandwidth of two neighboring fiber Bragg gratings of the gratings used for monitoring the deformation of rock layer should be no less than 6 nm. An effective new approach for detecting the deformation of rock settlement with fiber Bragg gratings is provided.