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Structural Design and Application of Desensitized FBG Force-Measuring Bolt
Minfu Liang1,2,3, Yang Song1,2, Xinqiu Fang1,2
1School of Mines, China University of Mining and Technology, Xuzhou 221116, China.
Sensors (Basel, Switzerland)
|May 28, 2022
Summary
This study introduces a novel fiber Bragg grating force-measuring bolt (FBG-FMB) for continuous monitoring of bolt conditions in mines. Field applications confirm its reliability for ensuring roadway safety and underground engineering support.
Area of Science:
- Geotechnical Engineering
- Sensor Technology
- Materials Science
Background:
- Bolt support is crucial for mine roadway safety.
- Existing fiber Bragg grating force-measuring bolts (FBG-FMBs) have limitations.
- Continuous monitoring of bolt working conditions is needed.
Purpose of the Study:
- To address limitations in current FBG-FMBs.
- To develop a reliable method for monitoring bolt rod working conditions.
- To propose a fiber grating strain desensitization sensing theory.
Main Methods:
- Developed a desensitized FBG-FMB using a spring as the elastic sensitive element.
- Conducted mechanical analysis and drawing tests.
- Performed field application tests in a coal mine roadway.
Main Results:
- The developed desensitized FBG-FMB demonstrated strain sensitivity greater than 60 times the micro-strain of the fiber grating.
- Verified the feasibility of the structural design.
- Obtained reliable working condition data of the bolt body in a coal mine roadway.
Conclusions:
- The desensitized FBG-FMB is a feasible and reliable solution for monitoring bolt conditions.
- This technology can enhance safety in mine roadways.
- The technology has broad applicability in underground engineering, including slopes, tunnels, and foundation pits.
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