Investigation of the Bearing Characteristics of Bolts on a Coal–Rock Combined Anchor Body under Different Pull-Out Rates
In order to reveal the influence of the pull-out rate on the load-bearing properties of the coal–rock combined anchor body, the mechanical properties and failure characteristics of a coal–rock combined anchor body under different pull-out rates (10, 20, 30, 40, 50 mm/min) were studied using the pull...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/9/3313 |
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| author | Pandong Zhang Lin Gao Xinyu Zhan Pengze Liu Xiangtao Kang Zhenqian Ma Yongyin Wang Ping Liu Sen Han |
| author_facet | Pandong Zhang Lin Gao Xinyu Zhan Pengze Liu Xiangtao Kang Zhenqian Ma Yongyin Wang Ping Liu Sen Han |
| author_sort | Pandong Zhang |
| collection | DOAJ |
| description | In order to reveal the influence of the pull-out rate on the load-bearing properties of the coal–rock combined anchor body, the mechanical properties and failure characteristics of a coal–rock combined anchor body under different pull-out rates (10, 20, 30, 40, 50 mm/min) were studied using the pull-out test and theoretical analysis. The results show that the bearing capacity of the bolt on the coal–rock combined anchor body improves under a dynamic load, but the load-bearing properties of the coal–rock combined anchor body are different from those of the full rock (coal) anchor body. With the increase in the pull-out rate, the maximum pull-out load of the bolt on the coal–rock combined anchor body increases first, then decreases, and finally tends to be stable. Under the condition of a low drawing rate, the bearing capacity of the coal–rock combined anchor system can be greatly improved, but when the pull-out rate exceeds 20 mm/min, the bearing capacity of the anchor system is reduced. The debonding process of the anchoring section of the coal–rock combined anchor body gradually expands from the beginning section of the anchor to the bottom of the borehole. The coal–rock combined anchor body undergoes time differential development of cracks, and the failure of the coal and rock mass occurs at different times. Its failure process can be divided into three stages: (1) the coal anchor and rock anchor act together; (2) the rock anchor acts alone; and (3) the coal anchor and rock anchor have residual action. |
| first_indexed | 2024-03-10T04:12:36Z |
| format | Article |
| id | doaj.art-e7ce14167bee42c1a49d54972be24f12 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T04:12:36Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-e7ce14167bee42c1a49d54972be24f122023-11-23T08:09:32ZengMDPI AGEnergies1996-10732022-05-01159331310.3390/en15093313Investigation of the Bearing Characteristics of Bolts on a Coal–Rock Combined Anchor Body under Different Pull-Out RatesPandong Zhang0Lin Gao1Xinyu Zhan2Pengze Liu3Xiangtao Kang4Zhenqian Ma5Yongyin Wang6Ping Liu7Sen Han8College of Mining, Guizhou University, Guiyang 550025, ChinaCollege of Mining, Guizhou University, Guiyang 550025, ChinaCollege of Mining, Guizhou University, Guiyang 550025, ChinaCollege of Mining, Guizhou University, Guiyang 550025, ChinaCollege of Mining, Guizhou University, Guiyang 550025, ChinaCollege of Mining, Guizhou University, Guiyang 550025, ChinaCollege of Mining, Guizhou University, Guiyang 550025, ChinaCollege of Mining, Guizhou University, Guiyang 550025, ChinaCollege of Mining, Guizhou University, Guiyang 550025, ChinaIn order to reveal the influence of the pull-out rate on the load-bearing properties of the coal–rock combined anchor body, the mechanical properties and failure characteristics of a coal–rock combined anchor body under different pull-out rates (10, 20, 30, 40, 50 mm/min) were studied using the pull-out test and theoretical analysis. The results show that the bearing capacity of the bolt on the coal–rock combined anchor body improves under a dynamic load, but the load-bearing properties of the coal–rock combined anchor body are different from those of the full rock (coal) anchor body. With the increase in the pull-out rate, the maximum pull-out load of the bolt on the coal–rock combined anchor body increases first, then decreases, and finally tends to be stable. Under the condition of a low drawing rate, the bearing capacity of the coal–rock combined anchor system can be greatly improved, but when the pull-out rate exceeds 20 mm/min, the bearing capacity of the anchor system is reduced. The debonding process of the anchoring section of the coal–rock combined anchor body gradually expands from the beginning section of the anchor to the bottom of the borehole. The coal–rock combined anchor body undergoes time differential development of cracks, and the failure of the coal and rock mass occurs at different times. Its failure process can be divided into three stages: (1) the coal anchor and rock anchor act together; (2) the rock anchor acts alone; and (3) the coal anchor and rock anchor have residual action.https://www.mdpi.com/1996-1073/15/9/3313coal–rock combined bodypull-out rateload-bearing propertiespull-out test |
| spellingShingle | Pandong Zhang Lin Gao Xinyu Zhan Pengze Liu Xiangtao Kang Zhenqian Ma Yongyin Wang Ping Liu Sen Han Investigation of the Bearing Characteristics of Bolts on a Coal–Rock Combined Anchor Body under Different Pull-Out Rates Energies coal–rock combined body pull-out rate load-bearing properties pull-out test |
| title | Investigation of the Bearing Characteristics of Bolts on a Coal–Rock Combined Anchor Body under Different Pull-Out Rates |
| title_full | Investigation of the Bearing Characteristics of Bolts on a Coal–Rock Combined Anchor Body under Different Pull-Out Rates |
| title_fullStr | Investigation of the Bearing Characteristics of Bolts on a Coal–Rock Combined Anchor Body under Different Pull-Out Rates |
| title_full_unstemmed | Investigation of the Bearing Characteristics of Bolts on a Coal–Rock Combined Anchor Body under Different Pull-Out Rates |
| title_short | Investigation of the Bearing Characteristics of Bolts on a Coal–Rock Combined Anchor Body under Different Pull-Out Rates |
| title_sort | investigation of the bearing characteristics of bolts on a coal rock combined anchor body under different pull out rates |
| topic | coal–rock combined body pull-out rate load-bearing properties pull-out test |
| url | https://www.mdpi.com/1996-1073/15/9/3313 |
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