Influence mechanisms of dynamic metamorphism on the evolution of micro/nano pore structures in tectonically deformed coals
ObjectiveMicro/nano pore structures in coals act as a significant space for gas occurrence. Exploring the evolutionary mechanisms of micro/nano pore structures in tectonically deformed coals (TDCs) under the influence of dynamic metamorphism assists in gaining a deep understanding of the mechanisms...
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Editorial Office of Coal Geology & Exploration
2024-12-01
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| Series: | Meitian dizhi yu kantan |
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| author | Hewu LIU Xiaoxue LYU Chenliang HOU Zuopeng XIONG |
| author_facet | Hewu LIU Xiaoxue LYU Chenliang HOU Zuopeng XIONG |
| author_sort | Hewu LIU |
| collection | DOAJ |
| description | ObjectiveMicro/nano pore structures in coals act as a significant space for gas occurrence. Exploring the evolutionary mechanisms of micro/nano pore structures in tectonically deformed coals (TDCs) under the influence of dynamic metamorphism assists in gaining a deep understanding of the mechanisms underlying coal and gas outbursts. MethodsUsing CO2 adsorption experiments, Fourier transform infrared (FTIR) spectroscopy, and molecular dynamics simulations, this study investigated the evolutionary characteristics and mechanisms of micro/nano pore structures in different TDCs occurring within the No.72 coal seam of the Qi’nan Coal Mine in Suzhou Province. Results and ConclusionsThe results indicate that with enhanced tectonic deformations, the pore sizes of ultra micropores (0.3 to 0.7 nm) shifted towards small pore sizes generally, and the micro/nano pores exhibited increased fractal dimensions of volumes and specific surface areas, intensified heterogeneity, and elevated complexity of pore structures. The results of molecular structure tests and molecular dynamics simulations reveal that the TDCs subjected to brittle deformations experienced primarily stress-induced degradation. Specifically, the activity of the molecular structures was enhanced by the breaking and dissociation of hydrogen bonds, aliphatic side chains, and oxygen-containing functional groups in the molecular structures of the TDCs, and the macromolecular structures of the TDCs were initially compressed under tectonic stress. In contrast, TDCs subjected to brittle-ductile and ductile deformations underwent significant stress-induced polycondensation. In detail, the aromatic structures in the TDCs experienced chemical changes like rotation, folding, and recombination, forming a more tightly arranged molecular structural configuration. Therefore, the enhanced tectonic deformations can lead to continuously compressed and changed macromolecular structures, as well as partitioned gaps between molecular structures. Consequently, the morphologies and sizes of micro/nano pore structures change, their pore complexity increases, and their pore sizes shift towards small pore sizes generally. |
| format | Article |
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| institution | Kabale University |
| issn | 1001-1986 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Editorial Office of Coal Geology & Exploration |
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| series | Meitian dizhi yu kantan |
| spelling | doaj-art-45164d70622e4797817a28f6833e20cd2024-12-30T05:21:44ZzhoEditorial Office of Coal Geology & ExplorationMeitian dizhi yu kantan1001-19862024-12-01521211210.12363/issn.1001-1986.24.06.037324-06-0373-Liu-HewuInfluence mechanisms of dynamic metamorphism on the evolution of micro/nano pore structures in tectonically deformed coalsHewu LIU0Xiaoxue LYU1Chenliang HOU2Zuopeng XIONG3State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, ChinaState Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, ChinaState Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, ChinaState Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, ChinaObjectiveMicro/nano pore structures in coals act as a significant space for gas occurrence. Exploring the evolutionary mechanisms of micro/nano pore structures in tectonically deformed coals (TDCs) under the influence of dynamic metamorphism assists in gaining a deep understanding of the mechanisms underlying coal and gas outbursts. MethodsUsing CO2 adsorption experiments, Fourier transform infrared (FTIR) spectroscopy, and molecular dynamics simulations, this study investigated the evolutionary characteristics and mechanisms of micro/nano pore structures in different TDCs occurring within the No.72 coal seam of the Qi’nan Coal Mine in Suzhou Province. Results and ConclusionsThe results indicate that with enhanced tectonic deformations, the pore sizes of ultra micropores (0.3 to 0.7 nm) shifted towards small pore sizes generally, and the micro/nano pores exhibited increased fractal dimensions of volumes and specific surface areas, intensified heterogeneity, and elevated complexity of pore structures. The results of molecular structure tests and molecular dynamics simulations reveal that the TDCs subjected to brittle deformations experienced primarily stress-induced degradation. Specifically, the activity of the molecular structures was enhanced by the breaking and dissociation of hydrogen bonds, aliphatic side chains, and oxygen-containing functional groups in the molecular structures of the TDCs, and the macromolecular structures of the TDCs were initially compressed under tectonic stress. In contrast, TDCs subjected to brittle-ductile and ductile deformations underwent significant stress-induced polycondensation. In detail, the aromatic structures in the TDCs experienced chemical changes like rotation, folding, and recombination, forming a more tightly arranged molecular structural configuration. Therefore, the enhanced tectonic deformations can lead to continuously compressed and changed macromolecular structures, as well as partitioned gaps between molecular structures. Consequently, the morphologies and sizes of micro/nano pore structures change, their pore complexity increases, and their pore sizes shift towards small pore sizes generally.http://www.mtdzykt.com/article/doi/10.12363/issn.1001-1986.24.06.0373tectonically deformed coal（tdc）dynamic metamorphismpore structuremolecular structureinfluence mechanism |
| spellingShingle | Hewu LIU Xiaoxue LYU Chenliang HOU Zuopeng XIONG Influence mechanisms of dynamic metamorphism on the evolution of micro/nano pore structures in tectonically deformed coals Meitian dizhi yu kantan tectonically deformed coal（tdc） dynamic metamorphism pore structure molecular structure influence mechanism |
| title | Influence mechanisms of dynamic metamorphism on the evolution of micro/nano pore structures in tectonically deformed coals |
| title_full | Influence mechanisms of dynamic metamorphism on the evolution of micro/nano pore structures in tectonically deformed coals |
| title_fullStr | Influence mechanisms of dynamic metamorphism on the evolution of micro/nano pore structures in tectonically deformed coals |
| title_full_unstemmed | Influence mechanisms of dynamic metamorphism on the evolution of micro/nano pore structures in tectonically deformed coals |
| title_short | Influence mechanisms of dynamic metamorphism on the evolution of micro/nano pore structures in tectonically deformed coals |
| title_sort | influence mechanisms of dynamic metamorphism on the evolution of micro nano pore structures in tectonically deformed coals |
| topic | tectonically deformed coal（tdc） dynamic metamorphism pore structure molecular structure influence mechanism |
| url | http://www.mtdzykt.com/article/doi/10.12363/issn.1001-1986.24.06.0373 |
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