Analysis on roof sag of pre-driven recovery room based on energy calculation
The fully mechanized mining face adopting pre-driven recovery room is prone to large roof deformation at the final mining stage, which will lead to support crushing accidents. Based on the three main roof failure forms after longwall face entered recovery room, this paper established different mecha...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Emergency Management Press
2023-10-01
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| Series: | 矿业科学学报 |
| Subjects: | |
| Online Access: | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2023.05.004 |
| _version_ | 1797780587574984704 |
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| author | Wang Bonan Gu Shuancheng Li Jun |
| author_facet | Wang Bonan Gu Shuancheng Li Jun |
| author_sort | Wang Bonan |
| collection | DOAJ |
| description | The fully mechanized mining face adopting pre-driven recovery room is prone to large roof deformation at the final mining stage, which will lead to support crushing accidents. Based on the three main roof failure forms after longwall face entered recovery room, this paper established different mechanical models for roof sag of the recovery room. By analyzing energy release and work process in roof deformation, this paper obtained the immediate roof sag of recovery room under different main roof failure forms. Taking the large roof deformation and support crushing accident of recovery room in the N14201 longwall face of Zhangjiamao Coal Mine as example for analysis, this paper analyzed the influencing factors of the models and found that the main roof break position, the thickness of key block and its overlying strata, the rotation angle of key block and the supporting intensity have significant impact on the roof sag of recovery room. The research results confirmed that the reason for the support crushing accident in N14201 longwall face of Zhangjiamao Coal Mine: the main roof is broken within 4~6 m above the protective coal pillar, and the main key stratum is broken and unstable due to the mining of upper 3-1 coal seam. |
| first_indexed | 2024-03-12T23:46:10Z |
| format | Article |
| id | doaj.art-26746ccff7c54c82a75065c1b0a50177 |
| institution | Directory Open Access Journal |
| issn | 2096-2193 |
| language | English |
| last_indexed | 2024-03-12T23:46:10Z |
| publishDate | 2023-10-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj.art-26746ccff7c54c82a75065c1b0a501772023-07-14T04:40:06ZengEmergency Management Press矿业科学学报2096-21932023-10-018562363210.19606/j.cnki.jmst.2023.05.004kykxxb-8-5-623Analysis on roof sag of pre-driven recovery room based on energy calculationWang Bonan0Gu Shuancheng1Li Jun2School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an Shaanxi 710048, ChinaSchool of Architecture and Civil Engineering, Xian University of Science and Technology, Xi'an Shaanxi 710054, ChinaShennan Zhangjiamao Mining Co., Ltd. of Shaanxi Coal Group, Shenmu Shaanxi 719300, ChinaThe fully mechanized mining face adopting pre-driven recovery room is prone to large roof deformation at the final mining stage, which will lead to support crushing accidents. Based on the three main roof failure forms after longwall face entered recovery room, this paper established different mechanical models for roof sag of the recovery room. By analyzing energy release and work process in roof deformation, this paper obtained the immediate roof sag of recovery room under different main roof failure forms. Taking the large roof deformation and support crushing accident of recovery room in the N14201 longwall face of Zhangjiamao Coal Mine as example for analysis, this paper analyzed the influencing factors of the models and found that the main roof break position, the thickness of key block and its overlying strata, the rotation angle of key block and the supporting intensity have significant impact on the roof sag of recovery room. The research results confirmed that the reason for the support crushing accident in N14201 longwall face of Zhangjiamao Coal Mine: the main roof is broken within 4~6 m above the protective coal pillar, and the main key stratum is broken and unstable due to the mining of upper 3-1 coal seam.http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2023.05.004fully-mechanized facefinal mining stagepre-driven recovery roomroof sagsupport crushing accident |
| spellingShingle | Wang Bonan Gu Shuancheng Li Jun Analysis on roof sag of pre-driven recovery room based on energy calculation 矿业科学学报 fully-mechanized face final mining stage pre-driven recovery room roof sag support crushing accident |
| title | Analysis on roof sag of pre-driven recovery room based on energy calculation |
| title_full | Analysis on roof sag of pre-driven recovery room based on energy calculation |
| title_fullStr | Analysis on roof sag of pre-driven recovery room based on energy calculation |
| title_full_unstemmed | Analysis on roof sag of pre-driven recovery room based on energy calculation |
| title_short | Analysis on roof sag of pre-driven recovery room based on energy calculation |
| title_sort | analysis on roof sag of pre driven recovery room based on energy calculation |
| topic | fully-mechanized face final mining stage pre-driven recovery room roof sag support crushing accident |
| url | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2023.05.004 |
| work_keys_str_mv | AT wangbonan analysisonroofsagofpredrivenrecoveryroombasedonenergycalculation AT gushuancheng analysisonroofsagofpredrivenrecoveryroombasedonenergycalculation AT lijun analysisonroofsagofpredrivenrecoveryroombasedonenergycalculation |