Application and Effect of Loading Rates on Coal Sample Failure
In order to evaluate the coal pillar stability in recovery of residual room pillars under different mining rates, this paper studies the influence of loading rate on the mechanical properties of the coal body. The uniaxial compression tests of coal samples in Yangcheng area at different loading rate...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/6681082 |
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| _version_ | 1850162007080173568 |
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| author | Genwei Li Shuaifeng Lu Sifei Liu Jing Liu Peng Shi Bowen Fan |
| author_facet | Genwei Li Shuaifeng Lu Sifei Liu Jing Liu Peng Shi Bowen Fan |
| author_sort | Genwei Li |
| collection | DOAJ |
| description | In order to evaluate the coal pillar stability in recovery of residual room pillars under different mining rates, this paper studies the influence of loading rate on the mechanical properties of the coal body. The uniaxial compression tests of coal samples in Yangcheng area at different loading rates were carried out with the MTS815 electrohydraulic servo rock mechanics test system. The stress-strain curves and the evolution characteristics of AE signals were analyzed. At same time, the mechanism of damage and failure of specimens are also discussed. The results show the following. (1) With the increase in loading rate, the ultimate stress and ultimate strain of specimens decrease first and then increase. (2) Loading rate has a significant effect on the stability adjustment of specimens. With the decrease in loading rate, the earlier the stress adjustment is, the larger the adjustment range is, and the failure mode changes from shear failure to tensile failure. (3) In addition, when the loading rate increases, the AE evolves from continuous dense to discrete catastrophe, which indicates that the failure of the sample at a larger loading rate is sudden, which is not conducive to the maintenance of the stability of the coal pillar. (4) Finally, the failure mechanism of the specimen structure under different loading rates is obtained, and the improvement measures for the effect of mining velocity of working face on the stability of coal pillar are put forward. The results reveal the loading rate effect of mechanical properties of coal and provide a reference for controlling the stability of the residual coal pillar. |
| format | Article |
| id | doaj-art-fd50267c344548bda2fbcf9823dc82e7 |
| institution | OA Journals |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-fd50267c344548bda2fbcf9823dc82e72025-08-20T02:22:40ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/66810826681082Application and Effect of Loading Rates on Coal Sample FailureGenwei Li0Shuaifeng Lu1Sifei Liu2Jing Liu3Peng Shi4Bowen Fan5College of Energy Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaDepartment of Mining Engineering, Lvliang University, Lvliang, Shanxi 033001, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaIn order to evaluate the coal pillar stability in recovery of residual room pillars under different mining rates, this paper studies the influence of loading rate on the mechanical properties of the coal body. The uniaxial compression tests of coal samples in Yangcheng area at different loading rates were carried out with the MTS815 electrohydraulic servo rock mechanics test system. The stress-strain curves and the evolution characteristics of AE signals were analyzed. At same time, the mechanism of damage and failure of specimens are also discussed. The results show the following. (1) With the increase in loading rate, the ultimate stress and ultimate strain of specimens decrease first and then increase. (2) Loading rate has a significant effect on the stability adjustment of specimens. With the decrease in loading rate, the earlier the stress adjustment is, the larger the adjustment range is, and the failure mode changes from shear failure to tensile failure. (3) In addition, when the loading rate increases, the AE evolves from continuous dense to discrete catastrophe, which indicates that the failure of the sample at a larger loading rate is sudden, which is not conducive to the maintenance of the stability of the coal pillar. (4) Finally, the failure mechanism of the specimen structure under different loading rates is obtained, and the improvement measures for the effect of mining velocity of working face on the stability of coal pillar are put forward. The results reveal the loading rate effect of mechanical properties of coal and provide a reference for controlling the stability of the residual coal pillar.http://dx.doi.org/10.1155/2021/6681082 |
| spellingShingle | Genwei Li Shuaifeng Lu Sifei Liu Jing Liu Peng Shi Bowen Fan Application and Effect of Loading Rates on Coal Sample Failure Shock and Vibration |
| title | Application and Effect of Loading Rates on Coal Sample Failure |
| title_full | Application and Effect of Loading Rates on Coal Sample Failure |
| title_fullStr | Application and Effect of Loading Rates on Coal Sample Failure |
| title_full_unstemmed | Application and Effect of Loading Rates on Coal Sample Failure |
| title_short | Application and Effect of Loading Rates on Coal Sample Failure |
| title_sort | application and effect of loading rates on coal sample failure |
| url | http://dx.doi.org/10.1155/2021/6681082 |
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