Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines
Influenced by the deep high-stress environment, geological structures, and mining disturbance in coal mines, the frequency of rockburst disasters in roadways is increasing. This research analyzed energy evolution characteristics during rockburst development in the elastic bearing zone and energy con...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-11-01
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| Series: | Frontiers in Energy Research |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2023.1283079/full |
| _version_ | 1797626647564779520 |
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| author | Zhongtang Xuan Zhongtang Xuan Zhongtang Xuan Zhiheng Cheng Chunyuan Li Chaojun Fan Hongyan Qin Wenchen Li Kai Guo Haoyi Chen Yifei Xie Likai Yang |
| author_facet | Zhongtang Xuan Zhongtang Xuan Zhongtang Xuan Zhiheng Cheng Chunyuan Li Chaojun Fan Hongyan Qin Wenchen Li Kai Guo Haoyi Chen Yifei Xie Likai Yang |
| author_sort | Zhongtang Xuan |
| collection | DOAJ |
| description | Influenced by the deep high-stress environment, geological structures, and mining disturbance in coal mines, the frequency of rockburst disasters in roadways is increasing. This research analyzed energy evolution characteristics during rockburst development in the elastic bearing zone and energy conversion in the plastic failure zone. The critical energy criteria for structural instability of roadway surrounding rocks were deduced. Numerical software was also applied to simulate the energy evolution during rockburst development in surrounding rocks of rockburst-prone roadways under conditions of different mining depths and coal pillar widths. The occurrence mechanism of rockburst deep in coal mines was analyzed from the perspective of energy in structures of deep roadway surrounding rock in coal mines. The research results show that the critical energy criteria are closely related to the elastic strain energy stored in deep roadway surrounding rocks and the energy absorbed by support systems. The impact energy in roadways is directly proportional to the square of the stress concentration factor k. Moreover, as the mining depth increases, the location of the peak point of maximum energy density gradually shifts to coal ahead of the working face. The larger the mining depth is, the more significantly the energy density is influenced by advanced abutment pressure of the working face and the wider the affected area is. With the increment of the coal pillar width, the distance from the peak point of energy density to the roadway boundary enlarges abruptly at first and then slowly, and the critical coal pillar width for gentle change in the distance is 30 m. Changes in the peak elastic energy density in coal pillars with the coal pillar width can be divided into four stages: the slow increase stage, abrupt increase stage, abrupt decrease stage, and slow decrease stage. The elastic energy density is distributed asymmetrically in deep roadway surrounding rocks in coal mines. Under the action of structures of roadway surrounding rocks, energy evolution in these structures differs greatly during rockburst development under conditions of different coal pillar widths. This research provides an important theoretical basis for the support of rockburst-prone roadways during deep coal mining. |
| first_indexed | 2024-03-11T10:13:10Z |
| format | Article |
| id | doaj.art-c71a12700f1945038c8476714e7da54c |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-03-11T10:13:10Z |
| publishDate | 2023-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-c71a12700f1945038c8476714e7da54c2023-11-16T13:58:54ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2023-11-011110.3389/fenrg.2023.12830791283079Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal minesZhongtang Xuan0Zhongtang Xuan1Zhongtang Xuan2Zhiheng Cheng3Chunyuan Li4Chaojun Fan5Hongyan Qin6Wenchen Li7Kai Guo8Haoyi Chen9Yifei Xie10Likai Yang11Chinese Institute of Coal Science, Beijing, ChinaChina University of Mining and Technology (Beijing), Beijing, ChinaChina Coal Research Institute, Beijing, ChinaSchool of Mining Safety, North China Institute of Science and Technology, Beijing, ChinaDeep Mining and Rockburst Prevention Institute, China Institute of Coal Science, Beijing, ChinaCollege of Mining, Liaoning Technical University, Fuxin, ChinaSchool of Safety Engineering, North China Institute of Science and Technology, Beijing, ChinaSchool of Mining Safety, North China Institute of Science and Technology, Beijing, ChinaSchool of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, ChinaSchool of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, ChinaSchool of Mining Safety, North China Institute of Science and Technology, Beijing, ChinaSchool of Mining Safety, North China Institute of Science and Technology, Beijing, ChinaInfluenced by the deep high-stress environment, geological structures, and mining disturbance in coal mines, the frequency of rockburst disasters in roadways is increasing. This research analyzed energy evolution characteristics during rockburst development in the elastic bearing zone and energy conversion in the plastic failure zone. The critical energy criteria for structural instability of roadway surrounding rocks were deduced. Numerical software was also applied to simulate the energy evolution during rockburst development in surrounding rocks of rockburst-prone roadways under conditions of different mining depths and coal pillar widths. The occurrence mechanism of rockburst deep in coal mines was analyzed from the perspective of energy in structures of deep roadway surrounding rock in coal mines. The research results show that the critical energy criteria are closely related to the elastic strain energy stored in deep roadway surrounding rocks and the energy absorbed by support systems. The impact energy in roadways is directly proportional to the square of the stress concentration factor k. Moreover, as the mining depth increases, the location of the peak point of maximum energy density gradually shifts to coal ahead of the working face. The larger the mining depth is, the more significantly the energy density is influenced by advanced abutment pressure of the working face and the wider the affected area is. With the increment of the coal pillar width, the distance from the peak point of energy density to the roadway boundary enlarges abruptly at first and then slowly, and the critical coal pillar width for gentle change in the distance is 30 m. Changes in the peak elastic energy density in coal pillars with the coal pillar width can be divided into four stages: the slow increase stage, abrupt increase stage, abrupt decrease stage, and slow decrease stage. The elastic energy density is distributed asymmetrically in deep roadway surrounding rocks in coal mines. Under the action of structures of roadway surrounding rocks, energy evolution in these structures differs greatly during rockburst development under conditions of different coal pillar widths. This research provides an important theoretical basis for the support of rockburst-prone roadways during deep coal mining.https://www.frontiersin.org/articles/10.3389/fenrg.2023.1283079/fullenergy evolution mechanismrockburstdeep coal minesrockburst-prone roadwaysstructures of surrounding rocks |
| spellingShingle | Zhongtang Xuan Zhongtang Xuan Zhongtang Xuan Zhiheng Cheng Chunyuan Li Chaojun Fan Hongyan Qin Wenchen Li Kai Guo Haoyi Chen Yifei Xie Likai Yang Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines Frontiers in Energy Research energy evolution mechanism rockburst deep coal mines rockburst-prone roadways structures of surrounding rocks |
| title | Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines |
| title_full | Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines |
| title_fullStr | Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines |
| title_full_unstemmed | Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines |
| title_short | Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines |
| title_sort | energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst prone roadways in coal mines |
| topic | energy evolution mechanism rockburst deep coal mines rockburst-prone roadways structures of surrounding rocks |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2023.1283079/full |
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