Research on damage and degradation of coal-bearing sandstone under freeze-thaw cycles
Comprehending the effect of freeze-thaw cycles on the damage and degradation of coal-bearing sandstones is crucial for the end-wall slope stability of open-pit mines in cold areas. In this study, freeze-thaw cycle tests on water-saturated coal-bearing sandstone samples under different freezing tempe...
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1522502/full |
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| author | Yiwen Mao Ming Li Peng Wu Shuai Guo Fuqiang Zhu |
| author_facet | Yiwen Mao Ming Li Peng Wu Shuai Guo Fuqiang Zhu |
| author_sort | Yiwen Mao |
| collection | DOAJ |
| description | Comprehending the effect of freeze-thaw cycles on the damage and degradation of coal-bearing sandstones is crucial for the end-wall slope stability of open-pit mines in cold areas. In this study, freeze-thaw cycle tests on water-saturated coal-bearing sandstone samples under different freezing temperatures and different freeze-thaw cycles were conducted by a fully automatic low-temperature freeze-thaw testing system, and the effects of freeze-thaw cycle parameters on P-wave velocity and porosity of sandstone samples were obtained. With the assistance of CT scanning imaging technology, the microscopic damage and deterioration mechanism of sandstone samples under freeze-thaw cycles was further revealed, and a characterization method for the damage and deterioration of sandstone samples under freeze-thaw cycles was established, and damage and degradation effects of freeze-thaw cycles on the sandstone samples were predicted. The research results suggest that as the freezing temperature decreases and the number of freeze-thaw cycles increases, the P-wave velocity of the sandstone sample decreases, while the volume of the sandstone sample increases. The relative change rate of P-wave velocity and porosity increment of the sample are positively correlated with freezing temperature, and negatively correlated with the number of freeze-thaw cycles. The CT scan results show that with the decrease of the freezing temperature and the increase of the number of freeze-thaw cycles, the number and geometric size of pores on the sample cross section increase significantly. Additionally, the evolution equation of freeze-thaw damage factors was established with freezing temperature and number of freeze-thaw cycles as parameters, and the internal mechanism and physical characterization of freeze-thaw damage degradation of coal measure sandstone were revealed. This research provides a reference for the safety and stability evaluation and technology research and development of related rock engineering in cold areas. |
| format | Article |
| id | doaj-art-a436755d3ec94d1ea6a2eadbb76718e9 |
| institution | DOAJ |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj-art-a436755d3ec94d1ea6a2eadbb76718e92025-08-20T02:45:30ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-01-011210.3389/feart.2024.15225021522502Research on damage and degradation of coal-bearing sandstone under freeze-thaw cyclesYiwen Mao0Ming Li1Peng Wu2Shuai Guo3Fuqiang Zhu4School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaSchool of Physics and New Energy, Xuzhou University of Technology, Xuzhou, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, ChinaComprehending the effect of freeze-thaw cycles on the damage and degradation of coal-bearing sandstones is crucial for the end-wall slope stability of open-pit mines in cold areas. In this study, freeze-thaw cycle tests on water-saturated coal-bearing sandstone samples under different freezing temperatures and different freeze-thaw cycles were conducted by a fully automatic low-temperature freeze-thaw testing system, and the effects of freeze-thaw cycle parameters on P-wave velocity and porosity of sandstone samples were obtained. With the assistance of CT scanning imaging technology, the microscopic damage and deterioration mechanism of sandstone samples under freeze-thaw cycles was further revealed, and a characterization method for the damage and deterioration of sandstone samples under freeze-thaw cycles was established, and damage and degradation effects of freeze-thaw cycles on the sandstone samples were predicted. The research results suggest that as the freezing temperature decreases and the number of freeze-thaw cycles increases, the P-wave velocity of the sandstone sample decreases, while the volume of the sandstone sample increases. The relative change rate of P-wave velocity and porosity increment of the sample are positively correlated with freezing temperature, and negatively correlated with the number of freeze-thaw cycles. The CT scan results show that with the decrease of the freezing temperature and the increase of the number of freeze-thaw cycles, the number and geometric size of pores on the sample cross section increase significantly. Additionally, the evolution equation of freeze-thaw damage factors was established with freezing temperature and number of freeze-thaw cycles as parameters, and the internal mechanism and physical characterization of freeze-thaw damage degradation of coal measure sandstone were revealed. This research provides a reference for the safety and stability evaluation and technology research and development of related rock engineering in cold areas.https://www.frontiersin.org/articles/10.3389/feart.2024.1522502/fullfreeze-thaw cyclecoal-bearing sandstonepore structuredamage and deteriorationmicroscopic mechanism |
| spellingShingle | Yiwen Mao Ming Li Peng Wu Shuai Guo Fuqiang Zhu Research on damage and degradation of coal-bearing sandstone under freeze-thaw cycles Frontiers in Earth Science freeze-thaw cycle coal-bearing sandstone pore structure damage and deterioration microscopic mechanism |
| title | Research on damage and degradation of coal-bearing sandstone under freeze-thaw cycles |
| title_full | Research on damage and degradation of coal-bearing sandstone under freeze-thaw cycles |
| title_fullStr | Research on damage and degradation of coal-bearing sandstone under freeze-thaw cycles |
| title_full_unstemmed | Research on damage and degradation of coal-bearing sandstone under freeze-thaw cycles |
| title_short | Research on damage and degradation of coal-bearing sandstone under freeze-thaw cycles |
| title_sort | research on damage and degradation of coal bearing sandstone under freeze thaw cycles |
| topic | freeze-thaw cycle coal-bearing sandstone pore structure damage and deterioration microscopic mechanism |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1522502/full |
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