Mechanism and Prevention of Rockburst in Deep Multipillar Gob-Side Entry
AbstractRockburst frequently occurs in deep multipillar gob-side entry in Inner Mongolia and Shaanxi, China. A case study of the Hongqinghe coal mine was analyzed to reveal the occurrence mechanism of rockburst in deep multipillar gob-side entry through theoretical and applied resear...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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GeoScienceWorld
2022-03-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/1509697/612306/Mechanism-and-Prevention-of-Rockburst-in-Deep |
| _version_ | 1811198830279917568 |
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| author | Junfeng Pan Taotao Du Jiaming Gao Fei Xie |
| author_facet | Junfeng Pan Taotao Du Jiaming Gao Fei Xie |
| author_sort | Junfeng Pan |
| collection | DOAJ |
| description |
AbstractRockburst frequently occurs in deep multipillar gob-side entry in Inner Mongolia and Shaanxi, China. A case study of the Hongqinghe coal mine was analyzed to reveal the occurrence mechanism of rockburst in deep multipillar gob-side entry through theoretical and applied research. And new control methods were put forward. The results show that there is an essential difference between the surrounding rock load characteristics of multipillar gob-side entry and single-pillar gob-side entry. Within the influence area of the lateral goaf, more coal pillars will promote stress concentration, and the high stress concentration area will migrate to the coal pillar of mining roadway. The hanging roof of the working face can cause the stress concentration in the area of leading coal pillar to reach 5 times. The multipillar gob-side entry is less affected by the dynamic load of the roof of the lateral goaf. The ‘F-shaped and L-shaped’ stress source structure model of the deep gob-side multipillar entry was established, and the occurrence mechanism of rockburst is revealed. On the one hand, the static load of rockburst start foundation is formed under the superposition of lateral goaf, rear goaf, and multicoal pillar. On the other hand, the superposition of the foundation static load and the opportune static load induces the start of rockburst. Aiming at the two types of load sources, the fracturing method of kilometer bedding drilling in the roof of coal pillar area is proposed to reduce the foundation static load. The treatment method of periodic tendency blasting fracture of leading roadway roof in a working face reduces opportune static load. The field test has been carried out, and the effect was good. |
| first_indexed | 2024-04-12T01:37:57Z |
| format | Article |
| id | doaj.art-fe96375046c24f1e9ad74eb68582a7cf |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-12T01:37:57Z |
| publishDate | 2022-03-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-fe96375046c24f1e9ad74eb68582a7cf2022-12-22T03:53:16ZengGeoScienceWorldLithosphere1941-82641947-42532022-03-012021Special 410.2113/2022/1509697Mechanism and Prevention of Rockburst in Deep Multipillar Gob-Side EntryJunfeng Pan0http://orcid.org/0000-0001-5011-8232Taotao Du1Jiaming Gao2http://orcid.org/0000-0002-6368-9920Fei Xie31 CCTEG Coal Mining Research Institute Beijing 100013 China1 CCTEG Coal Mining Research Institute Beijing 100013 China1 CCTEG Coal Mining Research Institute Beijing 100013 China1 CCTEG Coal Mining Research Institute Beijing 100013 China AbstractRockburst frequently occurs in deep multipillar gob-side entry in Inner Mongolia and Shaanxi, China. A case study of the Hongqinghe coal mine was analyzed to reveal the occurrence mechanism of rockburst in deep multipillar gob-side entry through theoretical and applied research. And new control methods were put forward. The results show that there is an essential difference between the surrounding rock load characteristics of multipillar gob-side entry and single-pillar gob-side entry. Within the influence area of the lateral goaf, more coal pillars will promote stress concentration, and the high stress concentration area will migrate to the coal pillar of mining roadway. The hanging roof of the working face can cause the stress concentration in the area of leading coal pillar to reach 5 times. The multipillar gob-side entry is less affected by the dynamic load of the roof of the lateral goaf. The ‘F-shaped and L-shaped’ stress source structure model of the deep gob-side multipillar entry was established, and the occurrence mechanism of rockburst is revealed. On the one hand, the static load of rockburst start foundation is formed under the superposition of lateral goaf, rear goaf, and multicoal pillar. On the other hand, the superposition of the foundation static load and the opportune static load induces the start of rockburst. Aiming at the two types of load sources, the fracturing method of kilometer bedding drilling in the roof of coal pillar area is proposed to reduce the foundation static load. The treatment method of periodic tendency blasting fracture of leading roadway roof in a working face reduces opportune static load. The field test has been carried out, and the effect was good.https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/1509697/612306/Mechanism-and-Prevention-of-Rockburst-in-Deep |
| spellingShingle | Junfeng Pan Taotao Du Jiaming Gao Fei Xie Mechanism and Prevention of Rockburst in Deep Multipillar Gob-Side Entry Lithosphere |
| title | Mechanism and Prevention of Rockburst in Deep Multipillar Gob-Side Entry |
| title_full | Mechanism and Prevention of Rockburst in Deep Multipillar Gob-Side Entry |
| title_fullStr | Mechanism and Prevention of Rockburst in Deep Multipillar Gob-Side Entry |
| title_full_unstemmed | Mechanism and Prevention of Rockburst in Deep Multipillar Gob-Side Entry |
| title_short | Mechanism and Prevention of Rockburst in Deep Multipillar Gob-Side Entry |
| title_sort | mechanism and prevention of rockburst in deep multipillar gob side entry |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/1509697/612306/Mechanism-and-Prevention-of-Rockburst-in-Deep |
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