Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods
To study the occurrence mechanism of rock burst during mining the irregular working face, the study took irregular panel 7447 near fault tectonic as an engineering background. The spatial fracture characteristic of overlying strata was analyzed by Winkler elastic foundation beam theory. Furthermore,...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-12-01
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| Series: | International Journal of Mining Science and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S209526861730424X |
| _version_ | 1818956372593606656 |
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| author | Zengqiang Yang Chang Liu Hengzhong Zhu Fuxing Xie Linming Dou Jianhang Chen |
| author_facet | Zengqiang Yang Chang Liu Hengzhong Zhu Fuxing Xie Linming Dou Jianhang Chen |
| author_sort | Zengqiang Yang |
| collection | DOAJ |
| description | To study the occurrence mechanism of rock burst during mining the irregular working face, the study took irregular panel 7447 near fault tectonic as an engineering background. The spatial fracture characteristic of overlying strata was analyzed by Winkler elastic foundation beam theory. Furthermore, the influence law of panel width to suspended width and limit breaking span of key strata were also analyzed by thin plate theory. Through micro-seismic monitoring, theoretical analysis, numerical simulation and working resistance of support of field measurement, this study investigated the fracture characteristic of overlying strata and mechanism of rock burst in irregular working face. The results show that the fracture characteristic of overlying strata shows a spatial trapezoid structure, with the main roof being as an undersurface. The fracture form changes from vertical “O-X” type to transverse “O-X” type with the increase of trapezoidal height. From the narrow mining face to the wide mining face, the suspended width of key strata is greater than its limit breaking width, and a strong dynamic load is produced by the fracture of key strata. The numerical simulation and micro-seismic monitoring results show that the initial fracture position of key strata is close to tailgate 7447. Also there is a high static load caused by fault tectonic. The dynamic and static combined load induce rock burst. Accordingly, a cooperative control technology was proposed, which can weaken dynamic load by hard roof directional hydraulic fracture and enhance surrounding rock by supporting system. Keywords: Rock burst, Irregular working face, Key strata, Dynamic and static combined load, Cooperative control |
| first_indexed | 2024-12-20T10:52:55Z |
| format | Article |
| id | doaj.art-44d11b67790c41a9aa1552469022c452 |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-12-20T10:52:55Z |
| publishDate | 2019-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-44d11b67790c41a9aa1552469022c4522022-12-21T19:43:13ZengElsevierInternational Journal of Mining Science and Technology2095-26862019-12-01296889897Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methodsZengqiang Yang0Chang Liu1Hengzhong Zhu2Fuxing Xie3Linming Dou4Jianhang Chen5School of Resource and Safety Engineering, China University of Mining & Technology, Beijing 100083, China; State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou 221116, ChinaScience & Technology Innovation Center, Coal Mining and Designing Department, Tiandi Science & Technology Co., Ltd, Beijing 100013, China; Corresponding author.School of Resource and Safety Engineering, China University of Mining & Technology, Beijing 100083, ChinaMine Construction Branch of Research Institute, China Coal Research Institute, Beijing 100013, ChinaState Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou 221116, ChinaSchool of Resource and Safety Engineering, China University of Mining & Technology, Beijing 100083, ChinaTo study the occurrence mechanism of rock burst during mining the irregular working face, the study took irregular panel 7447 near fault tectonic as an engineering background. The spatial fracture characteristic of overlying strata was analyzed by Winkler elastic foundation beam theory. Furthermore, the influence law of panel width to suspended width and limit breaking span of key strata were also analyzed by thin plate theory. Through micro-seismic monitoring, theoretical analysis, numerical simulation and working resistance of support of field measurement, this study investigated the fracture characteristic of overlying strata and mechanism of rock burst in irregular working face. The results show that the fracture characteristic of overlying strata shows a spatial trapezoid structure, with the main roof being as an undersurface. The fracture form changes from vertical “O-X” type to transverse “O-X” type with the increase of trapezoidal height. From the narrow mining face to the wide mining face, the suspended width of key strata is greater than its limit breaking width, and a strong dynamic load is produced by the fracture of key strata. The numerical simulation and micro-seismic monitoring results show that the initial fracture position of key strata is close to tailgate 7447. Also there is a high static load caused by fault tectonic. The dynamic and static combined load induce rock burst. Accordingly, a cooperative control technology was proposed, which can weaken dynamic load by hard roof directional hydraulic fracture and enhance surrounding rock by supporting system. Keywords: Rock burst, Irregular working face, Key strata, Dynamic and static combined load, Cooperative controlhttp://www.sciencedirect.com/science/article/pii/S209526861730424X |
| spellingShingle | Zengqiang Yang Chang Liu Hengzhong Zhu Fuxing Xie Linming Dou Jianhang Chen Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods International Journal of Mining Science and Technology |
| title | Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods |
| title_full | Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods |
| title_fullStr | Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods |
| title_full_unstemmed | Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods |
| title_short | Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods |
| title_sort | mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods |
| url | http://www.sciencedirect.com/science/article/pii/S209526861730424X |
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