Study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seams
Abstract Caving mining in extra-thick coal seams induces large-scale overburden movement, leading to more intense fracture processes in key strata, more significant surface subsidence, and frequent dynamic disasters in mines. This study, using the N34-2 caving face of the 17th coal seam at Junde Min...
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Nature Portfolio
2025-01-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-84984-y |
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| author | Tianwei Lan Zhijia Zhang Weiqiang Guo Zhu Li Guoqiang Wu Ping Fang |
| author_facet | Tianwei Lan Zhijia Zhang Weiqiang Guo Zhu Li Guoqiang Wu Ping Fang |
| author_sort | Tianwei Lan |
| collection | DOAJ |
| description | Abstract Caving mining in extra-thick coal seams induces large-scale overburden movement, leading to more intense fracture processes in key strata, more significant surface subsidence, and frequent dynamic disasters in mines. This study, using the N34-2 caving face of the 17th coal seam at Junde Mine as a case study, aims to investigate the time-varying linkage mechanism between surface subsidence, microseismic characteristics, and fracture scales of the overburden’s key strata under such mining conditions. Based on Timoshenko’s theory, a bearing fracture mode for the overburden’s key strata is proposed, and corresponding fracture criteria are established. The fracture modes and step distances of the N34-2 working face were calculated theoretically and verified using microseismic localization data, showing that higher key strata are more prone to bearing failure, leading to a significant increase in fracture step distances. Numerical simulations and surface monitoring techniques were employed to comprehensively analyze the main controlling factors for surface subsidence. To further clarify the linkage mechanism between the fracture of high-position key strata and surface subsidence, the full fracture cycle under extra-thick coal seam caving mining is divided into four sub-processes: short-term fracture, rapid movement, compaction stability, and energy accumulation. The dynamic relationship between overburden movement, microseismic data, and surface subsidence responses is analyzed for each sub-process, establishing a time-varying linkage system. This approach offers a more systematic and accurate method to predict and assess the overburden movement and fracture processes, providing new insights for the prevention and control of rock burst disasters in extra-thick coal seams. |
| format | Article |
| id | doaj-art-635c5137bb5c4ea495d525aa522364e9 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-635c5137bb5c4ea495d525aa522364e92025-01-19T12:21:51ZengNature PortfolioScientific Reports2045-23222025-01-0115111610.1038/s41598-024-84984-yStudy on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seamsTianwei Lan0Zhijia Zhang1Weiqiang Guo2Zhu Li3Guoqiang Wu4Ping Fang5School of Mining Engineering, Liaoning Technical UniversitySchool of Mining Engineering, Liaoning Technical UniversityNingxia Coal Industry Company, China Energy GroupLiming Coal and Coking Company, Wuhai Energy Company, China Energy GroupNingxia Coal Industry Company, China Energy GroupHaohua Hongqingliang Mining Company, LtdAbstract Caving mining in extra-thick coal seams induces large-scale overburden movement, leading to more intense fracture processes in key strata, more significant surface subsidence, and frequent dynamic disasters in mines. This study, using the N34-2 caving face of the 17th coal seam at Junde Mine as a case study, aims to investigate the time-varying linkage mechanism between surface subsidence, microseismic characteristics, and fracture scales of the overburden’s key strata under such mining conditions. Based on Timoshenko’s theory, a bearing fracture mode for the overburden’s key strata is proposed, and corresponding fracture criteria are established. The fracture modes and step distances of the N34-2 working face were calculated theoretically and verified using microseismic localization data, showing that higher key strata are more prone to bearing failure, leading to a significant increase in fracture step distances. Numerical simulations and surface monitoring techniques were employed to comprehensively analyze the main controlling factors for surface subsidence. To further clarify the linkage mechanism between the fracture of high-position key strata and surface subsidence, the full fracture cycle under extra-thick coal seam caving mining is divided into four sub-processes: short-term fracture, rapid movement, compaction stability, and energy accumulation. The dynamic relationship between overburden movement, microseismic data, and surface subsidence responses is analyzed for each sub-process, establishing a time-varying linkage system. This approach offers a more systematic and accurate method to predict and assess the overburden movement and fracture processes, providing new insights for the prevention and control of rock burst disasters in extra-thick coal seams.https://doi.org/10.1038/s41598-024-84984-y |
| spellingShingle | Tianwei Lan Zhijia Zhang Weiqiang Guo Zhu Li Guoqiang Wu Ping Fang Study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seams Scientific Reports |
| title | Study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seams |
| title_full | Study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seams |
| title_fullStr | Study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seams |
| title_full_unstemmed | Study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seams |
| title_short | Study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seams |
| title_sort | study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra thick coal seams |
| url | https://doi.org/10.1038/s41598-024-84984-y |
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