Measurements of Excavation Damaged Zone by Using Fiber Bragg Grating Stress Sensors
In this paper, a Fiber Bragg Grating (FBG) stress sensor is developed to measure the stress variation between the lower Excavation Damaged Zone (EDZ) and the upper undistributed rock. The disturbance brought by the environmental temperature can be differentially compensated with two FBGs mounted sym...
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| Format: | Article |
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MDPI AG
2021-07-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/21/15/5008 |
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| author | Xiaorong Wan Chuan Li Zhengang Zhao Dacheng Zhang Yingna Li Jiahong Zhang |
| author_facet | Xiaorong Wan Chuan Li Zhengang Zhao Dacheng Zhang Yingna Li Jiahong Zhang |
| author_sort | Xiaorong Wan |
| collection | DOAJ |
| description | In this paper, a Fiber Bragg Grating (FBG) stress sensor is developed to measure the stress variation between the lower Excavation Damaged Zone (EDZ) and the upper undistributed rock. The disturbance brought by the environmental temperature can be differentially compensated with two FBGs mounted symmetrically on the spokes. Through finite element analysis, it can be known that the direct stress and shear stress are pointed at the angles of 45° and 60° on both sides of the coal mine roadway, respectively. The anchor ends of the sensors are installed into the upper undistributed rock and the bolt tails of the mine roadway with a depth of 700 m and fastened by nuts to secure the load sensing device on the surface of the rock. When the shallow foundation of surrounding rock is pressed and deformed toward the coal mining road, the structural modifications can be converted into the stress of rock bolt and the strain of spoke. Thus, the FBG mounted on the surface of the spoke receives the shift information of the Bragg wavelength. The monitoring results indicate that the FBG stress sensors are sensitive to the variation of the EDZ. During the blasting, the stress amplitude varies from 40.256 to 175.058 kPa, and the creep time changes from 21 to 74 min. The proposed method can be applied in the field of underground coal mines for safety condition monitoring of the EDZ and forecasting the coal mine roadway stability. |
| first_indexed | 2024-03-10T09:09:13Z |
| format | Article |
| id | doaj.art-7d5d81b0879446398c4e8c4413788817 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T09:09:13Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-7d5d81b0879446398c4e8c44137888172023-11-22T06:09:06ZengMDPI AGSensors1424-82202021-07-012115500810.3390/s21155008Measurements of Excavation Damaged Zone by Using Fiber Bragg Grating Stress SensorsXiaorong Wan0Chuan Li1Zhengang Zhao2Dacheng Zhang3Yingna Li4Jiahong Zhang5Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaIn this paper, a Fiber Bragg Grating (FBG) stress sensor is developed to measure the stress variation between the lower Excavation Damaged Zone (EDZ) and the upper undistributed rock. The disturbance brought by the environmental temperature can be differentially compensated with two FBGs mounted symmetrically on the spokes. Through finite element analysis, it can be known that the direct stress and shear stress are pointed at the angles of 45° and 60° on both sides of the coal mine roadway, respectively. The anchor ends of the sensors are installed into the upper undistributed rock and the bolt tails of the mine roadway with a depth of 700 m and fastened by nuts to secure the load sensing device on the surface of the rock. When the shallow foundation of surrounding rock is pressed and deformed toward the coal mining road, the structural modifications can be converted into the stress of rock bolt and the strain of spoke. Thus, the FBG mounted on the surface of the spoke receives the shift information of the Bragg wavelength. The monitoring results indicate that the FBG stress sensors are sensitive to the variation of the EDZ. During the blasting, the stress amplitude varies from 40.256 to 175.058 kPa, and the creep time changes from 21 to 74 min. The proposed method can be applied in the field of underground coal mines for safety condition monitoring of the EDZ and forecasting the coal mine roadway stability.https://www.mdpi.com/1424-8220/21/15/5008coal and rockexcavation damaged zonestressdifferential fiber Bragg grating stress sensorblasting excavation |
| spellingShingle | Xiaorong Wan Chuan Li Zhengang Zhao Dacheng Zhang Yingna Li Jiahong Zhang Measurements of Excavation Damaged Zone by Using Fiber Bragg Grating Stress Sensors Sensors coal and rock excavation damaged zone stress differential fiber Bragg grating stress sensor blasting excavation |
| title | Measurements of Excavation Damaged Zone by Using Fiber Bragg Grating Stress Sensors |
| title_full | Measurements of Excavation Damaged Zone by Using Fiber Bragg Grating Stress Sensors |
| title_fullStr | Measurements of Excavation Damaged Zone by Using Fiber Bragg Grating Stress Sensors |
| title_full_unstemmed | Measurements of Excavation Damaged Zone by Using Fiber Bragg Grating Stress Sensors |
| title_short | Measurements of Excavation Damaged Zone by Using Fiber Bragg Grating Stress Sensors |
| title_sort | measurements of excavation damaged zone by using fiber bragg grating stress sensors |
| topic | coal and rock excavation damaged zone stress differential fiber Bragg grating stress sensor blasting excavation |
| url | https://www.mdpi.com/1424-8220/21/15/5008 |
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