Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine
To explore the fracture mechanism of surrounding rock for thermal-mechanical coupling in deep mining, the theoretical solution of the internal temperature and stress evolution of the underground chamber cold boundary subjected to cold impact was obtained by thermoelastic theory. The conduction law o...
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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: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/8490864 |
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| author | Xinghui Wu Qifeng Guo Peng Li Fenhua Ren Jie Zhang Meifeng Cai |
| author_facet | Xinghui Wu Qifeng Guo Peng Li Fenhua Ren Jie Zhang Meifeng Cai |
| author_sort | Xinghui Wu |
| collection | DOAJ |
| description | To explore the fracture mechanism of surrounding rock for thermal-mechanical coupling in deep mining, the theoretical solution of the internal temperature and stress evolution of the underground chamber cold boundary subjected to cold impact was obtained by thermoelastic theory. The conduction law of temperature and the evolution characteristics of stress were studied by theoretical formulas, and the influence of the convective heat transfer coefficient on the rate of tensile stress reduction was analyzed. The results show that the theoretical solution is in good agreement with the field measured value, which proves that the theoretical calculation method adopted in this paper is reliable and accurate. When the surface of the underground chamber is impacted by the change of temperature, the cold boundary temperature drops sharply at first, then gradually slows down, and finally reaches the same temperature as the air; the tensile stress decreases sharply from the initial high-stress value, then gradually decreases, and finally tends to be stable. The effects of different convective heat transfer coefficients on the change of temperature resistance of rocks were considered by numerical simulation. The numerical simulation results show that increasing the convective heat transfer coefficient not only increases the tensile stress of the heat transfer boundary but also increases the possibility of cracks, which makes the rock easier to crack. Based on the research results, we introduced the thermal-mechanical coupling disturbance range coefficient β = L/2D (β = 6–8) and proposed that the convective heat transfer coefficient is the reference index of the deep mining support structure, which can provide a theoretical basis and technical support for the selection of support materials. |
| format | Article |
| id | doaj-art-041d2ce23cc94f87a8d250b0bfae1d52 |
| institution | OA Journals |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-041d2ce23cc94f87a8d250b0bfae1d522025-08-20T02:03:05ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422021-01-01202110.1155/2021/84908648490864Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold MineXinghui Wu0Qifeng Guo1Peng Li2Fenhua Ren3Jie Zhang4Meifeng Cai5School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaTo explore the fracture mechanism of surrounding rock for thermal-mechanical coupling in deep mining, the theoretical solution of the internal temperature and stress evolution of the underground chamber cold boundary subjected to cold impact was obtained by thermoelastic theory. The conduction law of temperature and the evolution characteristics of stress were studied by theoretical formulas, and the influence of the convective heat transfer coefficient on the rate of tensile stress reduction was analyzed. The results show that the theoretical solution is in good agreement with the field measured value, which proves that the theoretical calculation method adopted in this paper is reliable and accurate. When the surface of the underground chamber is impacted by the change of temperature, the cold boundary temperature drops sharply at first, then gradually slows down, and finally reaches the same temperature as the air; the tensile stress decreases sharply from the initial high-stress value, then gradually decreases, and finally tends to be stable. The effects of different convective heat transfer coefficients on the change of temperature resistance of rocks were considered by numerical simulation. The numerical simulation results show that increasing the convective heat transfer coefficient not only increases the tensile stress of the heat transfer boundary but also increases the possibility of cracks, which makes the rock easier to crack. Based on the research results, we introduced the thermal-mechanical coupling disturbance range coefficient β = L/2D (β = 6–8) and proposed that the convective heat transfer coefficient is the reference index of the deep mining support structure, which can provide a theoretical basis and technical support for the selection of support materials.http://dx.doi.org/10.1155/2021/8490864 |
| spellingShingle | Xinghui Wu Qifeng Guo Peng Li Fenhua Ren Jie Zhang Meifeng Cai Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine Advances in Materials Science and Engineering |
| title | Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine |
| title_full | Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine |
| title_fullStr | Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine |
| title_full_unstemmed | Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine |
| title_short | Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine |
| title_sort | investigating the effect of temperature changes on the physical field of surrounding rock in a deep gold mine |
| url | http://dx.doi.org/10.1155/2021/8490864 |
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