Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush

Abstract The initiation process of the mine water inrush accident, the essence of this process is the sudden change of the seepage state of the broken coal medium under pressure and the instability of the skeleton. In order to study the re-crushing mechanism and seepage characteristics of the broken...

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Autores principales:	Mingkun Pang, Tianjun Zhang, Yi Guo, Lei Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/37adb74cec4f4582b0f71481cf42b26c
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spelling	oai:doaj.org-article:37adb74cec4f4582b0f71481cf42b26c2021-12-02T17:51:06ZRe-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush10.1038/s41598-021-90449-32045-2322https://doaj.org/article/37adb74cec4f4582b0f71481cf42b26c2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90449-3https://doaj.org/toc/2045-2322Abstract The initiation process of the mine water inrush accident, the essence of this process is the sudden change of the seepage state of the broken coal medium under pressure and the instability of the skeleton. In order to study the re-crushing mechanism and seepage characteristics of the broken coal medium under load, a set of three-axis seepage system was designed independently. Using the steady-state infiltration method, multiple flow factors under different particle size combinations and different stress conditions of the broken coal medium were obtained. The results of the study indicate: in one hand, the reduction of the porosity of the broken coal medium will cause the flow channel to be rebuilt, and the sudden change of flow rate will directly lead to the non-Darcian flow behavior. The early stage of compaction mainly affects the permeability k value, and the later stage of compaction mainly affects the non-Darcian β value; On the other hand, the seepage throat in the broken coal medium may have a sharp increase in its flow rate, leading to a sudden change in the flow pattern. The critical Reynolds number is also used to determine whether non-Darcian flow is formed, and its value in the water inrush system is about 40–133; at the same time, the non-Darcian flow in the broken coal medium conforms to the Forchheimer-type flow law. By analyzing the dependence relationship between factors, a seepage factor representation algebraic relationship suitable for Forchheimer type non-Darcian flow of broken coal medium is given, which can be used as a calculation basis in the prevention and treatment of mine water inrush accidents.Mingkun PangTianjun ZhangYi GuoLei ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mingkun Pang Tianjun Zhang Yi Guo Lei Zhang Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush
description	Abstract The initiation process of the mine water inrush accident, the essence of this process is the sudden change of the seepage state of the broken coal medium under pressure and the instability of the skeleton. In order to study the re-crushing mechanism and seepage characteristics of the broken coal medium under load, a set of three-axis seepage system was designed independently. Using the steady-state infiltration method, multiple flow factors under different particle size combinations and different stress conditions of the broken coal medium were obtained. The results of the study indicate: in one hand, the reduction of the porosity of the broken coal medium will cause the flow channel to be rebuilt, and the sudden change of flow rate will directly lead to the non-Darcian flow behavior. The early stage of compaction mainly affects the permeability k value, and the later stage of compaction mainly affects the non-Darcian β value; On the other hand, the seepage throat in the broken coal medium may have a sharp increase in its flow rate, leading to a sudden change in the flow pattern. The critical Reynolds number is also used to determine whether non-Darcian flow is formed, and its value in the water inrush system is about 40–133; at the same time, the non-Darcian flow in the broken coal medium conforms to the Forchheimer-type flow law. By analyzing the dependence relationship between factors, a seepage factor representation algebraic relationship suitable for Forchheimer type non-Darcian flow of broken coal medium is given, which can be used as a calculation basis in the prevention and treatment of mine water inrush accidents.
format	article
author	Mingkun Pang Tianjun Zhang Yi Guo Lei Zhang
author_facet	Mingkun Pang Tianjun Zhang Yi Guo Lei Zhang
author_sort	Mingkun Pang
title	Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush
title_short	Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush
title_full	Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush
title_fullStr	Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush
title_full_unstemmed	Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush
title_sort	re-crushing process and non-darcian seepage characteristics of broken coal medium in coal mine water inrush
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/37adb74cec4f4582b0f71481cf42b26c
work_keys_str_mv	AT mingkunpang recrushingprocessandnondarcianseepagecharacteristicsofbrokencoalmediumincoalminewaterinrush AT tianjunzhang recrushingprocessandnondarcianseepagecharacteristicsofbrokencoalmediumincoalminewaterinrush AT yiguo recrushingprocessandnondarcianseepagecharacteristicsofbrokencoalmediumincoalminewaterinrush AT leizhang recrushingprocessandnondarcianseepagecharacteristicsofbrokencoalmediumincoalminewaterinrush
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Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush

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