Practice of deep hole blasting and rapid charging technology for composite thick and hard roof
In order to control the dynamic pressure behavior of the working face under the condition of composite thick and hard roof, taking a mine in Ordos as an example, through theoretical analysis, it is clarified that the instability of small coal pillar roadway with thick and hard roof is mainly divided...
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Editorial Office of Safety in Coal Mines
2024-12-01
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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.20240641 |
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| author | Huijie BI Yunlong MO Shaogang LI |
| author_facet | Huijie BI Yunlong MO Shaogang LI |
| author_sort | Huijie BI |
| collection | DOAJ |
| description | In order to control the dynamic pressure behavior of the working face under the condition of composite thick and hard roof, taking a mine in Ordos as an example, through theoretical analysis, it is clarified that the instability of small coal pillar roadway with thick and hard roof is mainly divided into deformation instability and impact instability. Combined with micro-seismic monitoring and surface rock movement observation, the potential impact of overlying rock movement on dynamic pressure manifestation is analyzed, and the necessity of pre-pressure relief of high roof is clarified. On this basis, a high-low reinforcement blasting scheme for the roof was designed, and mechanized charging equipment was put into practice. The results showed that after using mechanized charging, the number of people in a single group was reduced from 6 to 3, and the duration of single hole charging for ultra-deep holes was controlled within 50 minutes. The micro-seismic activity in the secondary “square” area of the 33109 working face showed a trend of low frequency and low energy. The distribution range of micro-seismic events in advance had decreased from 238 m to 168 m, and the affected area had decreased by 29.4%. The overall resistance at the end of the support showed a decreasing trend, especially within the range from the middle of the working face to the side of the return air channel, where the decrease was more significant. The collapse of the roof on one side of the return airway could closely follow the end support, and the length of the suspended roof on the transport roadway side was generally not more than 5 m. |
| format | Article |
| id | doaj-art-e57201bb56af4794ab96c89b45c1876c |
| institution | OA Journals |
| issn | 1003-496X |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Editorial Office of Safety in Coal Mines |
| record_format | Article |
| series | Meikuang Anquan |
| spelling | doaj-art-e57201bb56af4794ab96c89b45c1876c2025-08-20T02:36:54ZzhoEditorial Office of Safety in Coal MinesMeikuang Anquan1003-496X2024-12-015512313810.13347/j.cnki.mkaq.20240641cMKAQ20240641Practice of deep hole blasting and rapid charging technology for composite thick and hard roofHuijie BI0Yunlong MO1Shaogang LI2China Coal Research Institute, Beijing 100013, ChinaChina Coal Research Institute, Beijing 100013, ChinaChina Coal Research Institute, Beijing 100013, ChinaIn order to control the dynamic pressure behavior of the working face under the condition of composite thick and hard roof, taking a mine in Ordos as an example, through theoretical analysis, it is clarified that the instability of small coal pillar roadway with thick and hard roof is mainly divided into deformation instability and impact instability. Combined with micro-seismic monitoring and surface rock movement observation, the potential impact of overlying rock movement on dynamic pressure manifestation is analyzed, and the necessity of pre-pressure relief of high roof is clarified. On this basis, a high-low reinforcement blasting scheme for the roof was designed, and mechanized charging equipment was put into practice. The results showed that after using mechanized charging, the number of people in a single group was reduced from 6 to 3, and the duration of single hole charging for ultra-deep holes was controlled within 50 minutes. The micro-seismic activity in the secondary “square” area of the 33109 working face showed a trend of low frequency and low energy. The distribution range of micro-seismic events in advance had decreased from 238 m to 168 m, and the affected area had decreased by 29.4%. The overall resistance at the end of the support showed a decreasing trend, especially within the range from the middle of the working face to the side of the return air channel, where the decrease was more significant. The collapse of the roof on one side of the return airway could closely follow the end support, and the length of the suspended roof on the transport roadway side was generally not more than 5 m.https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20240641composite thick and hard roofhigh and low level enhanced blastingmechanized chargingmicro-seismic activityend resistance of bracketsuspended roof |
| spellingShingle | Huijie BI Yunlong MO Shaogang LI Practice of deep hole blasting and rapid charging technology for composite thick and hard roof Meikuang Anquan composite thick and hard roof high and low level enhanced blasting mechanized charging micro-seismic activity end resistance of bracket suspended roof |
| title | Practice of deep hole blasting and rapid charging technology for composite thick and hard roof |
| title_full | Practice of deep hole blasting and rapid charging technology for composite thick and hard roof |
| title_fullStr | Practice of deep hole blasting and rapid charging technology for composite thick and hard roof |
| title_full_unstemmed | Practice of deep hole blasting and rapid charging technology for composite thick and hard roof |
| title_short | Practice of deep hole blasting and rapid charging technology for composite thick and hard roof |
| title_sort | practice of deep hole blasting and rapid charging technology for composite thick and hard roof |
| topic | composite thick and hard roof high and low level enhanced blasting mechanized charging micro-seismic activity end resistance of bracket suspended roof |
| url | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20240641 |
| work_keys_str_mv | AT huijiebi practiceofdeepholeblastingandrapidchargingtechnologyforcompositethickandhardroof AT yunlongmo practiceofdeepholeblastingandrapidchargingtechnologyforcompositethickandhardroof AT shaogangli practiceofdeepholeblastingandrapidchargingtechnologyforcompositethickandhardroof |