Study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams mining
In order to study the instability and failure issues of overlying room coal pillar in shallow buried and close distance coal seams, and put forward the control method for coal pillar stability, the method of combining the mechanical properties test experiment of filing material and FLAC3D numerical...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Safety in Coal Mines
2025-03-01
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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.20231538 |
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| author | Pengjie LI Feng YANG Haifu CHEN Jialiang GAO Rui ZHAO |
| author_facet | Pengjie LI Feng YANG Haifu CHEN Jialiang GAO Rui ZHAO |
| author_sort | Pengjie LI |
| collection | DOAJ |
| description | In order to study the instability and failure issues of overlying room coal pillar in shallow buried and close distance coal seams, and put forward the control method for coal pillar stability, the method of combining the mechanical properties test experiment of filing material and FLAC3D numerical simulation was used. The experimental investigation shows that when the pressure of compaction test reaches 15 MPa, the aeolian sand filling material will be basically dense; the mechanical properties test of aeolian sand-loess mixed material indicates that when the ratio of aeolian sand to loess is 1:0.4, the material has smaller deformation and stronger compressive capacity, which is used as the solid filling material in 2305 working face. In addition, when the 2305 working face is mined by caving method, the coal pillar has a large area of overall damage, the overall failure rate of the coal pillar is 93.7%. The overall failure rate of coal pillar is 88.6%, 14.9% and 11.4% when solid filling rate is 40%, 60% and 80%, respectively. Combined with the research results, the overall stability of coal pillar in overlying goaf can be effectively controlled when the filling rate is 60%. |
| format | Article |
| id | doaj-art-2bac32d353eb49bda11d26d3a2eb173e |
| institution | OA Journals |
| issn | 1003-496X |
| language | zho |
| publishDate | 2025-03-01 |
| publisher | Editorial Office of Safety in Coal Mines |
| record_format | Article |
| series | Meikuang Anquan |
| spelling | doaj-art-2bac32d353eb49bda11d26d3a2eb173e2025-08-20T01:49:14ZzhoEditorial Office of Safety in Coal MinesMeikuang Anquan1003-496X2025-03-0156316717610.13347/j.cnki.mkaq.20231538zMKAQ20231538Study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams miningPengjie LI0Feng YANG1Haifu CHEN2Jialiang GAO3Rui ZHAO4School of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaIn order to study the instability and failure issues of overlying room coal pillar in shallow buried and close distance coal seams, and put forward the control method for coal pillar stability, the method of combining the mechanical properties test experiment of filing material and FLAC3D numerical simulation was used. The experimental investigation shows that when the pressure of compaction test reaches 15 MPa, the aeolian sand filling material will be basically dense; the mechanical properties test of aeolian sand-loess mixed material indicates that when the ratio of aeolian sand to loess is 1:0.4, the material has smaller deformation and stronger compressive capacity, which is used as the solid filling material in 2305 working face. In addition, when the 2305 working face is mined by caving method, the coal pillar has a large area of overall damage, the overall failure rate of the coal pillar is 93.7%. The overall failure rate of coal pillar is 88.6%, 14.9% and 11.4% when solid filling rate is 40%, 60% and 80%, respectively. Combined with the research results, the overall stability of coal pillar in overlying goaf can be effectively controlled when the filling rate is 60%.https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20231538close distance coal seamsroom mining goafcoal pillar instability failurecoal pillar stabilitysolid filling mining |
| spellingShingle | Pengjie LI Feng YANG Haifu CHEN Jialiang GAO Rui ZHAO Study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams mining Meikuang Anquan close distance coal seams room mining goaf coal pillar instability failure coal pillar stability solid filling mining |
| title | Study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams mining |
| title_full | Study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams mining |
| title_fullStr | Study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams mining |
| title_full_unstemmed | Study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams mining |
| title_short | Study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams mining |
| title_sort | study on failure law and stability control of overlying room coal pillar in shallow buried close distance coal seams mining |
| topic | close distance coal seams room mining goaf coal pillar instability failure coal pillar stability solid filling mining |
| url | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20231538 |
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