Study on the Evolution Law of Overlying Rock Collapse Induced by Mining Based on BOTDR
Based on Brillouin optical time-domain reflectometry (BOTDR) technology, this study integrates laboratory tensile tests and similarity simulation experiments to systematically investigate the relationship between overlying strata collapse and fiber strain during coal seam mining. An analytical expre...
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MDPI AG
2025-06-01
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| Online Access: | https://www.mdpi.com/2076-3417/15/11/6369 |
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| author | Chenrui Huang Chaomin Mu Hui Zhou Quanmin Xie |
| author_facet | Chenrui Huang Chaomin Mu Hui Zhou Quanmin Xie |
| author_sort | Chenrui Huang |
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| description | Based on Brillouin optical time-domain reflectometry (BOTDR) technology, this study integrates laboratory tensile tests and similarity simulation experiments to systematically investigate the relationship between overlying strata collapse and fiber strain during coal seam mining. An analytical expression was established to describe the correlation between overlying strata displacement and fiber strain. The horizontal fiber monitoring results indicate that fiber strain accurately captures the evolution of overlying strata collapse and exhibits strong agreement with actual displacement height. When the working face advanced to 115 m and 155 m, the rock strata primarily underwent stress adjustment with minimal failure. At 195 m, the collapse zone expanded significantly, resulting in a notable increase in fiber strain. By 240 m, severe roof failure occurred, forming a complete caving zone in the goaf. The fiber strain curve exhibited a characteristic “double convex peak” pattern, with peak positions closely corresponding to rock fracture locations, further validating the feasibility of fiber monitoring in coal seam mining. Vertical fiber monitoring clearly delineated the evolution of the “three-zone” structure (caving zone, fracture zone, and bending subsidence zone) in the overlying strata. The fiber strain underwent a staged transformation from compressive strain to tensile strain, followed by stable compaction. The “stepped” characteristics of the strain curve effectively represented the heights of the three zones, highlighting the progressive and synchronized nature of rock failure. These findings demonstrate that fiber strain effectively characterizes the collapse height and evolution of overlying strata, enabling precise identification of rock fracture locations. This research provides scientific insights and technical support for roof stability assessment and mine safety management in coal seam mining. |
| format | Article |
| id | doaj-art-62694392f6b3462a94c615921fa5cc5c |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-62694392f6b3462a94c615921fa5cc5c2025-08-20T02:32:34ZengMDPI AGApplied Sciences2076-34172025-06-011511636910.3390/app15116369Study on the Evolution Law of Overlying Rock Collapse Induced by Mining Based on BOTDRChenrui Huang0Chaomin Mu1Hui Zhou2Quanmin Xie3State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, ChinaState Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, ChinaState Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, ChinaState Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, ChinaBased on Brillouin optical time-domain reflectometry (BOTDR) technology, this study integrates laboratory tensile tests and similarity simulation experiments to systematically investigate the relationship between overlying strata collapse and fiber strain during coal seam mining. An analytical expression was established to describe the correlation between overlying strata displacement and fiber strain. The horizontal fiber monitoring results indicate that fiber strain accurately captures the evolution of overlying strata collapse and exhibits strong agreement with actual displacement height. When the working face advanced to 115 m and 155 m, the rock strata primarily underwent stress adjustment with minimal failure. At 195 m, the collapse zone expanded significantly, resulting in a notable increase in fiber strain. By 240 m, severe roof failure occurred, forming a complete caving zone in the goaf. The fiber strain curve exhibited a characteristic “double convex peak” pattern, with peak positions closely corresponding to rock fracture locations, further validating the feasibility of fiber monitoring in coal seam mining. Vertical fiber monitoring clearly delineated the evolution of the “three-zone” structure (caving zone, fracture zone, and bending subsidence zone) in the overlying strata. The fiber strain underwent a staged transformation from compressive strain to tensile strain, followed by stable compaction. The “stepped” characteristics of the strain curve effectively represented the heights of the three zones, highlighting the progressive and synchronized nature of rock failure. These findings demonstrate that fiber strain effectively characterizes the collapse height and evolution of overlying strata, enabling precise identification of rock fracture locations. This research provides scientific insights and technical support for roof stability assessment and mine safety management in coal seam mining.https://www.mdpi.com/2076-3417/15/11/6369distributed optical fiberoverlying rock collapseoptical fiber strainsimilar simulation |
| spellingShingle | Chenrui Huang Chaomin Mu Hui Zhou Quanmin Xie Study on the Evolution Law of Overlying Rock Collapse Induced by Mining Based on BOTDR Applied Sciences distributed optical fiber overlying rock collapse optical fiber strain similar simulation |
| title | Study on the Evolution Law of Overlying Rock Collapse Induced by Mining Based on BOTDR |
| title_full | Study on the Evolution Law of Overlying Rock Collapse Induced by Mining Based on BOTDR |
| title_fullStr | Study on the Evolution Law of Overlying Rock Collapse Induced by Mining Based on BOTDR |
| title_full_unstemmed | Study on the Evolution Law of Overlying Rock Collapse Induced by Mining Based on BOTDR |
| title_short | Study on the Evolution Law of Overlying Rock Collapse Induced by Mining Based on BOTDR |
| title_sort | study on the evolution law of overlying rock collapse induced by mining based on botdr |
| topic | distributed optical fiber overlying rock collapse optical fiber strain similar simulation |
| url | https://www.mdpi.com/2076-3417/15/11/6369 |
| work_keys_str_mv | AT chenruihuang studyontheevolutionlawofoverlyingrockcollapseinducedbyminingbasedonbotdr AT chaominmu studyontheevolutionlawofoverlyingrockcollapseinducedbyminingbasedonbotdr AT huizhou studyontheevolutionlawofoverlyingrockcollapseinducedbyminingbasedonbotdr AT quanminxie studyontheevolutionlawofoverlyingrockcollapseinducedbyminingbasedonbotdr |