Research on overburden movement laws and spontaneous combustion “three zones” of composite goaf in shallow buried depth and stereo-intersected coal seam group
To thoroughly investigate the effects of coal seam group mining on overburden movement and coal spontaneous combustion risks, this study focuses on the composite goaf of the 12204 and 22206 working faces in Daliuta Huojitu Mine; this study systematically studies the overburden movement and surface s...
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Editorial Office of Safety in Coal Mines
2025-05-01
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| Series: | Meikuang Anquan |
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| Online Access: | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20241560 |
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| author | Dianfu CHEN Quan NI Bing WU Yang LI |
| author_facet | Dianfu CHEN Quan NI Bing WU Yang LI |
| author_sort | Dianfu CHEN |
| collection | DOAJ |
| description | To thoroughly investigate the effects of coal seam group mining on overburden movement and coal spontaneous combustion risks, this study focuses on the composite goaf of the 12204 and 22206 working faces in Daliuta Huojitu Mine; this study systematically studies the overburden movement and surface subsidence characteristics induced by coal seam group mining and further finds out the risk of coal spontaneous combustion risks in the composite goaf by integrating numerical simulations. Theoretical calculation combining with UAV-based measurements are used to comprehensively assess surface subsidence in the composite goaf. The study employed 3DEC numerical simulation software to simulate the impacts of composite coal seam mining on overburden movement. Simulation results were validated using surface subsidence data, and the Fluent software was utilized to refine the delineation of the spontaneous combustion “three zones” in the composite goaf by incorporating an oxygen consumption function. This facilitated an in-depth analysis of the spatial distribution characteristics of the oxidation zone and its implications for coal spontaneous combustion risks. Theoretical calculations revealed that the maximum surface subsidence in the recompaction zones of the 12204 and 22206 working faces was 3.54 m and 1.06 m, respectively. UAV-based differential elevation measurements indicated that the surface subsidence in the overlapping goaf region reached up to 5 m. Simulated data showed that the surface subsidence coefficient in the overlapping region of the coal seam group mining was 0.24, whereas the coefficient above the coal pillars in the lower coal seam was only 0.12. The surface subsidence caused by coal seam group mining was double that of single-seam mining. Furthermore, after the lower coal seam was mined, the overburden experienced secondary compressive deformation, with the caving angle reduced by approximately 9° compared to the initial deformation. The oxygen field simulation using Fluent demonstrated that the oxidation zone width on the intake side of the lower coal seam was approximately 143 m, while that on the return side was about 50 m. The oxidation zone areas of the upper and lower coal seam floors were 26 676 m2 and 24 003 m2, respectively, indicating a higher risk of spontaneous combustion in the upper coal seam. High oxygen volume fraction zones were primarily concentrated on the intake side and in fracture-developed areas. |
| format | Article |
| id | doaj-art-da7a76fbd41a463491e242fbf10760ef |
| institution | DOAJ |
| issn | 1003-496X |
| language | zho |
| publishDate | 2025-05-01 |
| publisher | Editorial Office of Safety in Coal Mines |
| record_format | Article |
| series | Meikuang Anquan |
| spelling | doaj-art-da7a76fbd41a463491e242fbf10760ef2025-08-20T03:10:34ZzhoEditorial Office of Safety in Coal MinesMeikuang Anquan1003-496X2025-05-0156513114210.13347/j.cnki.mkaq.20241560MKAQ20241560Research on overburden movement laws and spontaneous combustion “three zones” of composite goaf in shallow buried depth and stereo-intersected coal seam groupDianfu CHEN0Quan NI1Bing WU2Yang LI3CHN Energy Shendong Coal Group Co., Ltd., Yulin 719000, ChinaDaliuta Coal Mine, CHN Energy Shendong Coal Group Co., Ltd., Yulin 719315, ChinaSchool of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaTo thoroughly investigate the effects of coal seam group mining on overburden movement and coal spontaneous combustion risks, this study focuses on the composite goaf of the 12204 and 22206 working faces in Daliuta Huojitu Mine; this study systematically studies the overburden movement and surface subsidence characteristics induced by coal seam group mining and further finds out the risk of coal spontaneous combustion risks in the composite goaf by integrating numerical simulations. Theoretical calculation combining with UAV-based measurements are used to comprehensively assess surface subsidence in the composite goaf. The study employed 3DEC numerical simulation software to simulate the impacts of composite coal seam mining on overburden movement. Simulation results were validated using surface subsidence data, and the Fluent software was utilized to refine the delineation of the spontaneous combustion “three zones” in the composite goaf by incorporating an oxygen consumption function. This facilitated an in-depth analysis of the spatial distribution characteristics of the oxidation zone and its implications for coal spontaneous combustion risks. Theoretical calculations revealed that the maximum surface subsidence in the recompaction zones of the 12204 and 22206 working faces was 3.54 m and 1.06 m, respectively. UAV-based differential elevation measurements indicated that the surface subsidence in the overlapping goaf region reached up to 5 m. Simulated data showed that the surface subsidence coefficient in the overlapping region of the coal seam group mining was 0.24, whereas the coefficient above the coal pillars in the lower coal seam was only 0.12. The surface subsidence caused by coal seam group mining was double that of single-seam mining. Furthermore, after the lower coal seam was mined, the overburden experienced secondary compressive deformation, with the caving angle reduced by approximately 9° compared to the initial deformation. The oxygen field simulation using Fluent demonstrated that the oxidation zone width on the intake side of the lower coal seam was approximately 143 m, while that on the return side was about 50 m. The oxidation zone areas of the upper and lower coal seam floors were 26 676 m2 and 24 003 m2, respectively, indicating a higher risk of spontaneous combustion in the upper coal seam. High oxygen volume fraction zones were primarily concentrated on the intake side and in fracture-developed areas.https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20241560shallow buried depth and stereo-intersected coal seam groupoverburden movementsurface subsidencecomposite goafspontaneous combustion “three zones” |
| spellingShingle | Dianfu CHEN Quan NI Bing WU Yang LI Research on overburden movement laws and spontaneous combustion “three zones” of composite goaf in shallow buried depth and stereo-intersected coal seam group Meikuang Anquan shallow buried depth and stereo-intersected coal seam group overburden movement surface subsidence composite goaf spontaneous combustion “three zones” |
| title | Research on overburden movement laws and spontaneous combustion “three zones” of composite goaf in shallow buried depth and stereo-intersected coal seam group |
| title_full | Research on overburden movement laws and spontaneous combustion “three zones” of composite goaf in shallow buried depth and stereo-intersected coal seam group |
| title_fullStr | Research on overburden movement laws and spontaneous combustion “three zones” of composite goaf in shallow buried depth and stereo-intersected coal seam group |
| title_full_unstemmed | Research on overburden movement laws and spontaneous combustion “three zones” of composite goaf in shallow buried depth and stereo-intersected coal seam group |
| title_short | Research on overburden movement laws and spontaneous combustion “three zones” of composite goaf in shallow buried depth and stereo-intersected coal seam group |
| title_sort | research on overburden movement laws and spontaneous combustion three zones of composite goaf in shallow buried depth and stereo intersected coal seam group |
| topic | shallow buried depth and stereo-intersected coal seam group overburden movement surface subsidence composite goaf spontaneous combustion “three zones” |
| url | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20241560 |
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