Study of water-conducting fractured zone development law and assessment method in longwall mining of shallow coal seam
Abstract Starting from the source of mining, scientific understanding of surface damage law and assessment method in longwall mining of shallow coal seam is conducive to solving the problems of geological hazards and deterioration of the ecological environment, and promoting the coordinated developm...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-05-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-12023-9 |
| _version_ | 1817988190341955584 |
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| author | Xiaobin Li Dongliang Ji Penghua Han Quansheng Li Hongbao Zhao Fulian He |
| author_facet | Xiaobin Li Dongliang Ji Penghua Han Quansheng Li Hongbao Zhao Fulian He |
| author_sort | Xiaobin Li |
| collection | DOAJ |
| description | Abstract Starting from the source of mining, scientific understanding of surface damage law and assessment method in longwall mining of shallow coal seam is conducive to solving the problems of geological hazards and deterioration of the ecological environment, and promoting the coordinated development of efficient coal mining and environmental protection. Based on numerical simulation and theoretical analysis, the surface damage process and spatiotemporal evolution of fracture field are discussed. The influencing factors and assessment method of surface damage are clarified. The results show that surface damage undergone the immediate roof caving stage, the fracture and instability stage of main roof, the spatial amplification stage of separation layer, the instability stage of surface damage control layer and the mining damage stability stage. Under the critical extraction condition, the cracks above the goaf are divided into the crack area outside the cut, the crack area inside the cut, the re-compaction area in the middle goaf, the crack area behind the longwall face, and the crack area in front of the longwall face. The overburden reaches critical failure ahead of surface critical mining. The sensitivity of loose layer thickness to surface subsidence coefficient is greater than that of mining thickness to surface subsidence coefficient. Surface damage control should be adjusted to local conditions, and finally realize zoning treatment and zoning repair. Through the three-step method of "longwall face rapid advancing method, local grouting reinforcement overburden method and zoning treatment ground fissures method", the surface damage control of 12,401 longwall face is realized. This research provides theoretical guidance and application value for surface ecological restoration in similar mining area. |
| first_indexed | 2024-04-14T00:32:25Z |
| format | Article |
| id | doaj.art-a047418caf864a13bebea5ebface6734 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-14T00:32:25Z |
| publishDate | 2022-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-a047418caf864a13bebea5ebface67342022-12-22T02:22:31ZengNature PortfolioScientific Reports2045-23222022-05-0112111610.1038/s41598-022-12023-9Study of water-conducting fractured zone development law and assessment method in longwall mining of shallow coal seamXiaobin Li0Dongliang Ji1Penghua Han2Quansheng Li3Hongbao Zhao4Fulian He5School of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingAbstract Starting from the source of mining, scientific understanding of surface damage law and assessment method in longwall mining of shallow coal seam is conducive to solving the problems of geological hazards and deterioration of the ecological environment, and promoting the coordinated development of efficient coal mining and environmental protection. Based on numerical simulation and theoretical analysis, the surface damage process and spatiotemporal evolution of fracture field are discussed. The influencing factors and assessment method of surface damage are clarified. The results show that surface damage undergone the immediate roof caving stage, the fracture and instability stage of main roof, the spatial amplification stage of separation layer, the instability stage of surface damage control layer and the mining damage stability stage. Under the critical extraction condition, the cracks above the goaf are divided into the crack area outside the cut, the crack area inside the cut, the re-compaction area in the middle goaf, the crack area behind the longwall face, and the crack area in front of the longwall face. The overburden reaches critical failure ahead of surface critical mining. The sensitivity of loose layer thickness to surface subsidence coefficient is greater than that of mining thickness to surface subsidence coefficient. Surface damage control should be adjusted to local conditions, and finally realize zoning treatment and zoning repair. Through the three-step method of "longwall face rapid advancing method, local grouting reinforcement overburden method and zoning treatment ground fissures method", the surface damage control of 12,401 longwall face is realized. This research provides theoretical guidance and application value for surface ecological restoration in similar mining area.https://doi.org/10.1038/s41598-022-12023-9 |
| spellingShingle | Xiaobin Li Dongliang Ji Penghua Han Quansheng Li Hongbao Zhao Fulian He Study of water-conducting fractured zone development law and assessment method in longwall mining of shallow coal seam Scientific Reports |
| title | Study of water-conducting fractured zone development law and assessment method in longwall mining of shallow coal seam |
| title_full | Study of water-conducting fractured zone development law and assessment method in longwall mining of shallow coal seam |
| title_fullStr | Study of water-conducting fractured zone development law and assessment method in longwall mining of shallow coal seam |
| title_full_unstemmed | Study of water-conducting fractured zone development law and assessment method in longwall mining of shallow coal seam |
| title_short | Study of water-conducting fractured zone development law and assessment method in longwall mining of shallow coal seam |
| title_sort | study of water conducting fractured zone development law and assessment method in longwall mining of shallow coal seam |
| url | https://doi.org/10.1038/s41598-022-12023-9 |
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