Structural Design and Application of Desensitized FBG Force-Measuring Bolt.
Structural Design and Application of Desensitized FBG Force-Measuring Bolt.
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减敏FBG测力螺栓的结构设计及应用
DOI：
10.3390/s22103930
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发表时间：
2022-05-23
期刊：
影响因子：
--
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中科院分区：
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锚杆支护技术在矿井巷道支护中得到了广泛的应用，其自身的工作条件对巷道安全支护具有重要的参考价值。为了实现锚杆工作状态的连续可靠监测，分析了现有光纤光栅测力锚杆（FBG-FMB）存在的问题，提出了光纤光栅应变脱敏传感理论。在此基础上，研制了一种以弹簧为弹性敏感元件的消敏型光纤光栅微珠。力学分析和拉伸试验表明，测力螺栓的应变大于光纤光栅微应变的60倍，验证了FBG FMB结构设计的可行性。最后，通过在煤矿巷道中的现场应用，得到了锚杆体在巷道两个测点处的工作情况，验证了测力锚杆的可靠性。此外，脱敏后的FBG-FMB还可广泛应用于边坡、隧道、基坑等地下工程的支护领域。
Bolt-supporting technology has been widely used in mine roadway support, and its own working conditions have important reference value for roadway safety support. In order to realize the continuous and reliable monitoring of the bolt rod’s working condition, this paper analyzes the existing problems of the existing fiber Bragg grating force-measuring bolt (FBG-FMB), and proposes a fiber grating strain desensitization sensing theory. Based on this theory, a desensitized FBG-FMB is developed with the spring as the elastic sensitive element. A mechanical analysis and drawing test show that the strain of the force-measuring bolt is greater than 60 times the micro-strain of the fiber grating, which verifies the feasibility of the structure design of the FBG-FMB. Finally, through the field application in the coal mine roadway, the working conditions of the bolt body at the two measuring points of the roadway are obtained to verify the reliability of the force-measuring bolt. In addition, the desensitized FBG-FMB can be widely used in the supporting fields of underground engineering such as slopes, tunnels, and foundation pits.
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