Insight into the Creep Damage Evolution in Water-Immersed Coal Pillars: Experiment and Numerical Model Investigation
Coal mine underground reservoirs play a significant role in energy utilization while also contributing to energy security. Prolonged immersion in mine water reduces the long-term strength of coal, subsequently leading to continuous creep damage in coal pillars. This manifests as the propagation of d...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-06-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/13/3340 |
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| author | Xueliang Li Sihai Yi Zheng Chen Qingbiao Guo Xiangjun Cai Xin Guo Haiyang Yi |
| author_facet | Xueliang Li Sihai Yi Zheng Chen Qingbiao Guo Xiangjun Cai Xin Guo Haiyang Yi |
| author_sort | Xueliang Li |
| collection | DOAJ |
| description | Coal mine underground reservoirs play a significant role in energy utilization while also contributing to energy security. Prolonged immersion in mine water reduces the long-term strength of coal, subsequently leading to continuous creep damage in coal pillars. This manifests as the propagation of damage, ultimately resulting in instability, which affects their load-bearing capacity and impermeability. A multi-faceted approach involving laboratory experiments, similar model tests, and numerical simulations was employed to investigate the mechanical properties of water-immersed coal and the continuous creep damage process in coal pillars. Key findings reveal that water immersion significantly diminishes the long-term strength of coal; for example, initial instantaneous strain rose from 0.16% (non-immersed) to 0.25% (8-week immersion), with final creep strain reaching 1.15% versus 0.78%, respectively. The combined modeling methods effectively replicated the creep damage process, demonstrating that when concentrated stress exceeds the reduced long-term strength of coal, damage propagates toward the center of the pillar, forming continuous creep damage extending approximately 3.8 m within 7 years. This study contributes to our understanding of the creep damage mechanism in coal pillars and supports the long-term stability evaluation of CMURs. |
| format | Article |
| id | doaj-art-52a95698b4dd4f5580e680ba8471edd0 |
| institution | DOAJ |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-52a95698b4dd4f5580e680ba8471edd02025-08-20T03:16:42ZengMDPI AGEnergies1996-10732025-06-011813334010.3390/en18133340Insight into the Creep Damage Evolution in Water-Immersed Coal Pillars: Experiment and Numerical Model InvestigationXueliang Li0Sihai Yi1Zheng Chen2Qingbiao Guo3Xiangjun Cai4Xin Guo5Haiyang Yi6Beijing Tianma Intelligent Control Technology Co., Ltd., Beijing 101399, ChinaSchool of Safety Engineering, North China Institute of Science and Technology, Langfang 065201, ChinaSchool of Mine Safety, North China Institute of Science and Technology, Langfang 065201, ChinaSchool of Geomatics, Anhui University of Science and Technology, Huainan 232001, ChinaKailuan Energy Chemical Co., Ltd., Tangshan 063100, ChinaThe Urban and Rural Planning Service Center of Yuncheng County, Heze 274799, ChinaSchool of Mine Safety, North China Institute of Science and Technology, Langfang 065201, ChinaCoal mine underground reservoirs play a significant role in energy utilization while also contributing to energy security. Prolonged immersion in mine water reduces the long-term strength of coal, subsequently leading to continuous creep damage in coal pillars. This manifests as the propagation of damage, ultimately resulting in instability, which affects their load-bearing capacity and impermeability. A multi-faceted approach involving laboratory experiments, similar model tests, and numerical simulations was employed to investigate the mechanical properties of water-immersed coal and the continuous creep damage process in coal pillars. Key findings reveal that water immersion significantly diminishes the long-term strength of coal; for example, initial instantaneous strain rose from 0.16% (non-immersed) to 0.25% (8-week immersion), with final creep strain reaching 1.15% versus 0.78%, respectively. The combined modeling methods effectively replicated the creep damage process, demonstrating that when concentrated stress exceeds the reduced long-term strength of coal, damage propagates toward the center of the pillar, forming continuous creep damage extending approximately 3.8 m within 7 years. This study contributes to our understanding of the creep damage mechanism in coal pillars and supports the long-term stability evaluation of CMURs.https://www.mdpi.com/1996-1073/18/13/3340coal pillarunderground water reservoirdamage propagationsimilar modelcreep damage |
| spellingShingle | Xueliang Li Sihai Yi Zheng Chen Qingbiao Guo Xiangjun Cai Xin Guo Haiyang Yi Insight into the Creep Damage Evolution in Water-Immersed Coal Pillars: Experiment and Numerical Model Investigation Energies coal pillar underground water reservoir damage propagation similar model creep damage |
| title | Insight into the Creep Damage Evolution in Water-Immersed Coal Pillars: Experiment and Numerical Model Investigation |
| title_full | Insight into the Creep Damage Evolution in Water-Immersed Coal Pillars: Experiment and Numerical Model Investigation |
| title_fullStr | Insight into the Creep Damage Evolution in Water-Immersed Coal Pillars: Experiment and Numerical Model Investigation |
| title_full_unstemmed | Insight into the Creep Damage Evolution in Water-Immersed Coal Pillars: Experiment and Numerical Model Investigation |
| title_short | Insight into the Creep Damage Evolution in Water-Immersed Coal Pillars: Experiment and Numerical Model Investigation |
| title_sort | insight into the creep damage evolution in water immersed coal pillars experiment and numerical model investigation |
| topic | coal pillar underground water reservoir damage propagation similar model creep damage |
| url | https://www.mdpi.com/1996-1073/18/13/3340 |
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