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Evolutionary Model and Experimental Validation of Gas-Bearing Coal Permeability under Negative Pressure Conditions

[Image: see text] Coal bed methane drainage is the main approach to lower risks of coal seam while raising the efficiency in natural resource utilization. The negative pressure used for extraction in coal mines is largely determined empirically due to a lack of experimental research on how coal perm...

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Autores principales: Li, Xiangchun, Shi, Yaoyu, Zeng, Jianhua, Zhang, Qi, Gao, Jiaxing, Zhang, Liang, Huang, Tao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10157848/
https://www.ncbi.nlm.nih.gov/pubmed/37151551
http://dx.doi.org/10.1021/acsomega.3c01349
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author Li, Xiangchun
Shi, Yaoyu
Zeng, Jianhua
Zhang, Qi
Gao, Jiaxing
Zhang, Liang
Huang, Tao
author_facet Li, Xiangchun
Shi, Yaoyu
Zeng, Jianhua
Zhang, Qi
Gao, Jiaxing
Zhang, Liang
Huang, Tao
author_sort Li, Xiangchun
collection PubMed
description [Image: see text] Coal bed methane drainage is the main approach to lower risks of coal seam while raising the efficiency in natural resource utilization. The negative pressure used for extraction in coal mines is largely determined empirically due to a lack of experimental research on how coal permeability changes under the combined influence of effective stress and negative pressure. This results in low gas extraction efficiency and concentration. In this paper, to study the effect law of complex stress and extraction on coal permeability during coal and gas co-mining, a test system was specially designed to determine the gas flow and coal permeability of coal samples under different stress paths and negative pressure conditions in the lab. The study analyzed the correlation between coal permeability, effective stress, and negative pressure and subsequently developed a permeability evolution model for gas-bearing coal under negative pressure conditions. The results showed that the permeability of coal increases with the increase in negative pressure and decreases with the increase in effective stress; the permeability of coal can be abruptly changed by changes in stress loading patterns; the established model of permeability evolution of gas-bearing coal can better reflect the correlation between permeability, effective stress, and negative pressure. The research outcomes offer a valuable theoretical foundation for the efficient extraction and utilization of methane in coal mines.
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spelling pubmed-101578482023-05-05 Evolutionary Model and Experimental Validation of Gas-Bearing Coal Permeability under Negative Pressure Conditions Li, Xiangchun Shi, Yaoyu Zeng, Jianhua Zhang, Qi Gao, Jiaxing Zhang, Liang Huang, Tao ACS Omega [Image: see text] Coal bed methane drainage is the main approach to lower risks of coal seam while raising the efficiency in natural resource utilization. The negative pressure used for extraction in coal mines is largely determined empirically due to a lack of experimental research on how coal permeability changes under the combined influence of effective stress and negative pressure. This results in low gas extraction efficiency and concentration. In this paper, to study the effect law of complex stress and extraction on coal permeability during coal and gas co-mining, a test system was specially designed to determine the gas flow and coal permeability of coal samples under different stress paths and negative pressure conditions in the lab. The study analyzed the correlation between coal permeability, effective stress, and negative pressure and subsequently developed a permeability evolution model for gas-bearing coal under negative pressure conditions. The results showed that the permeability of coal increases with the increase in negative pressure and decreases with the increase in effective stress; the permeability of coal can be abruptly changed by changes in stress loading patterns; the established model of permeability evolution of gas-bearing coal can better reflect the correlation between permeability, effective stress, and negative pressure. The research outcomes offer a valuable theoretical foundation for the efficient extraction and utilization of methane in coal mines. American Chemical Society 2023-04-19 /pmc/articles/PMC10157848/ /pubmed/37151551 http://dx.doi.org/10.1021/acsomega.3c01349 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Li, Xiangchun
Shi, Yaoyu
Zeng, Jianhua
Zhang, Qi
Gao, Jiaxing
Zhang, Liang
Huang, Tao
Evolutionary Model and Experimental Validation of Gas-Bearing Coal Permeability under Negative Pressure Conditions
title Evolutionary Model and Experimental Validation of Gas-Bearing Coal Permeability under Negative Pressure Conditions
title_full Evolutionary Model and Experimental Validation of Gas-Bearing Coal Permeability under Negative Pressure Conditions
title_fullStr Evolutionary Model and Experimental Validation of Gas-Bearing Coal Permeability under Negative Pressure Conditions
title_full_unstemmed Evolutionary Model and Experimental Validation of Gas-Bearing Coal Permeability under Negative Pressure Conditions
title_short Evolutionary Model and Experimental Validation of Gas-Bearing Coal Permeability under Negative Pressure Conditions
title_sort evolutionary model and experimental validation of gas-bearing coal permeability under negative pressure conditions
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10157848/
https://www.ncbi.nlm.nih.gov/pubmed/37151551
http://dx.doi.org/10.1021/acsomega.3c01349
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