Failure characteristics and control technology of “L-shaped” isolated island working face inroadway inflection point area
Pillar free mining technology is widely used in coal mining field in China. After the formation of isolated island working face, it is affected by strong mining movement, which leads to the phenomenon of large deformation and instability of mining roadway during coal mining, which becomes one of the...
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Editorial Office of Safety in Coal Mines
2025-06-01
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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.20231271 |
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| author | Yanxue CHENG Hui WANG Weihua JIN Shuai NIU |
| author_facet | Yanxue CHENG Hui WANG Weihua JIN Shuai NIU |
| author_sort | Yanxue CHENG |
| collection | DOAJ |
| description | Pillar free mining technology is widely used in coal mining field in China. After the formation of isolated island working face, it is affected by strong mining movement, which leads to the phenomenon of large deformation and instability of mining roadway during coal mining, which becomes one of the difficult problems in roadway support at present. In order to solve the problems of serious deformation and crushing of surrounding rock at the inflection point of roadway with “L-shaped” working face and difficult support, taking the inflection point of roadway with “L-shaped” island working face in Chengcun Mine as the engineering background, the failure characteristics of inflection point of 14071 “L-shaped” working face and the impact of different support strength conditions on plastic failure zone of return air roadway were investigated through comprehensive research methods such as theoretical analysis, numerical simulation and industrial experiment. The failure mechanism of “L-shaped” working face roadway inflection point area and the roadway control technology under stress concentration environment are studied. The results show that the concentration coefficient of abutment pressure in the inflection point area of the roadway increases, and the plastic damage range of the roadway side is large due to gangue extrusion, which leads to the fracture of the main structure of the ordinary support and the large deformation of the surrounding rock of the roadway can not be effectively suppressed. The developed integrated retaining board with retaining top and retaining bottom can control the deformation of the side of gob-side entry driving. The retaining board can reduce the deformation of surrounding rock by 50%, providing an effective way to control such surrounding rock. |
| format | Article |
| id | doaj-art-d62d0a3f80454fb2b7413aefeefaaa5a |
| institution | Kabale University |
| issn | 1003-496X |
| language | zho |
| publishDate | 2025-06-01 |
| publisher | Editorial Office of Safety in Coal Mines |
| record_format | Article |
| series | Meikuang Anquan |
| spelling | doaj-art-d62d0a3f80454fb2b7413aefeefaaa5a2025-08-20T03:45:15ZzhoEditorial Office of Safety in Coal MinesMeikuang Anquan1003-496X2025-06-0156613314310.13347/j.cnki.mkaq.20231271MKAQ20231271Failure characteristics and control technology of “L-shaped” isolated island working face inroadway inflection point areaYanxue CHENG0Hui WANG1Weihua JIN2Shuai NIU3No.8 Coal Mine, Hebi Coal Power Co., Ltd., Hebi 458000, ChinaNo.8 Coal Mine, Hebi Coal Power Co., Ltd., Hebi 458000, ChinaProduction Technology Department, Hebi Coal Power Co., Ltd., Hebi 458000, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, ChinaPillar free mining technology is widely used in coal mining field in China. After the formation of isolated island working face, it is affected by strong mining movement, which leads to the phenomenon of large deformation and instability of mining roadway during coal mining, which becomes one of the difficult problems in roadway support at present. In order to solve the problems of serious deformation and crushing of surrounding rock at the inflection point of roadway with “L-shaped” working face and difficult support, taking the inflection point of roadway with “L-shaped” island working face in Chengcun Mine as the engineering background, the failure characteristics of inflection point of 14071 “L-shaped” working face and the impact of different support strength conditions on plastic failure zone of return air roadway were investigated through comprehensive research methods such as theoretical analysis, numerical simulation and industrial experiment. The failure mechanism of “L-shaped” working face roadway inflection point area and the roadway control technology under stress concentration environment are studied. The results show that the concentration coefficient of abutment pressure in the inflection point area of the roadway increases, and the plastic damage range of the roadway side is large due to gangue extrusion, which leads to the fracture of the main structure of the ordinary support and the large deformation of the surrounding rock of the roadway can not be effectively suppressed. The developed integrated retaining board with retaining top and retaining bottom can control the deformation of the side of gob-side entry driving. The retaining board can reduce the deformation of surrounding rock by 50%, providing an effective way to control such surrounding rock.https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20231271“l-shaped” isolated island working faceinflection point of roadwayroadway supportsurrounding rock control |
| spellingShingle | Yanxue CHENG Hui WANG Weihua JIN Shuai NIU Failure characteristics and control technology of “L-shaped” isolated island working face inroadway inflection point area Meikuang Anquan “l-shaped” isolated island working face inflection point of roadway roadway support surrounding rock control |
| title | Failure characteristics and control technology of “L-shaped” isolated island working face inroadway inflection point area |
| title_full | Failure characteristics and control technology of “L-shaped” isolated island working face inroadway inflection point area |
| title_fullStr | Failure characteristics and control technology of “L-shaped” isolated island working face inroadway inflection point area |
| title_full_unstemmed | Failure characteristics and control technology of “L-shaped” isolated island working face inroadway inflection point area |
| title_short | Failure characteristics and control technology of “L-shaped” isolated island working face inroadway inflection point area |
| title_sort | failure characteristics and control technology of l shaped isolated island working face inroadway inflection point area |
| topic | “l-shaped” isolated island working face inflection point of roadway roadway support surrounding rock control |
| url | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20231271 |
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