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Appl. Sci. 2018, 8(1), 107;

Application of Fiber Bragg Grating Sensing Technology for Bolt Force Status Monitoring in Roadways

Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Author to whom correspondence should be addressed.
Received: 21 December 2017 / Revised: 8 January 2018 / Accepted: 11 January 2018 / Published: 12 January 2018
(This article belongs to the Special Issue Fiber Bragg Gratings: Fundamentals, Materials and Applications)
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Bolts support have become a major active support method in coal mine roadways to control roadway roof failure and improve surrounding rock structure stability. The traditional bolt force status monitoring (BFSM) method has poor anti-interference performance, is easily affected by harsh downhole environments, and cannot support remote real-time monitoring. This paper presents a fiber Bragg grating (FBG) bolt force sensor that monitors the force of roadway bolts. This sensor uses a cantilever and a diaphragm as elastic elements and two FBGs bonded on the top and bottom surfaces of the cantilever as sensing elements. The experimental results indicate that the measuring sensitivity is improved by using the center wavelength difference between the two FBGs. The sensitivity is 38.79 pm/kN within the range from 0 to 150 kN, and the correlation coefficient reaches 99.98%. The engineering applications show that the FBG sensing technology can automatically acquire, and monitoring results are of great significance in roadway anchorage engineering safety and bolt support quality evaluation. Furthermore, such a sensor is also widely used in quasi-distributed measurement and long-term online monitoring of bolt force status in such fields as geotechnical engineering, tunnel engineering, and slope engineering. View Full-Text
Keywords: fiber Bragg grating (FBG); diaphragm-cantilever; bolt force; monitoring system; roadway fiber Bragg grating (FBG); diaphragm-cantilever; bolt force; monitoring system; roadway

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Liang, M.; Fang, X. Application of Fiber Bragg Grating Sensing Technology for Bolt Force Status Monitoring in Roadways. Appl. Sci. 2018, 8, 107.

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