Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network

The process of underground coal mining fractures the overlying strata and may provide storage and transportation space for gas by changing the roof rock permeability, which is released by pressure after mining. This paper adopts the experimental method of physical similarity simulation and combines...

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Autores principales:	Peiyun Xu, Shugang Li, Haifei Lin, Yang Ding, Haiqing Shuang, Sibo Liu, Yu Tian
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	permeability fractal dimension overburden fracture physical similarity simulation pressure-relief gas high-level borehole Technology T
Acceso en línea:	https://doaj.org/article/35bbeac36d0c4d7ebba15b12bb54e3d3
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id	oai:doaj.org-article:35bbeac36d0c4d7ebba15b12bb54e3d3
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spelling	oai:doaj.org-article:35bbeac36d0c4d7ebba15b12bb54e3d32021-11-11T15:50:57ZFractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network10.3390/en142170311996-1073https://doaj.org/article/35bbeac36d0c4d7ebba15b12bb54e3d32021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7031https://doaj.org/toc/1996-1073The process of underground coal mining fractures the overlying strata and may provide storage and transportation space for gas by changing the roof rock permeability, which is released by pressure after mining. This paper adopts the experimental method of physical similarity simulation and combines the fractal theory to study the permeability characteristics of the fracture network after mining, and it establishes the fractal permeability equation of pressure-relief gas. The results of the study show that the fracture opening shows a positive correlation with the overburden permeability, whereas the tortuosity of the fracture shows a negative correlation with the overburden permeability. The shape of the high permeability area in the fracture network is found to be similar to the hat-shaped elliptical parabolic zone. In the process of permeability evolution, the key layer structure of the overburden rock is considered as the main factor that affects the trend of change in permeability. Furthermore, based on the above research results, this study developed a targeted design of high-level boreholes in the experimental face and reversed the permeability changes around the drainage borehole. The average error between the actual measured value and the theoretically calculated value is found to be 8.11%. The theoretical model and the permeability evolution law obtained from the research results can provide valuable references and insights into further research on the pressure-relief gas flow model in the goaf.Peiyun XuShugang LiHaifei LinYang DingHaiqing ShuangSibo LiuYu TianMDPI AGarticlepermeabilityfractal dimensionoverburden fracturephysical similarity simulationpressure-relief gashigh-level boreholeTechnologyTENEnergies, Vol 14, Iss 7031, p 7031 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	permeability fractal dimension overburden fracture physical similarity simulation pressure-relief gas high-level borehole Technology T
spellingShingle	permeability fractal dimension overburden fracture physical similarity simulation pressure-relief gas high-level borehole Technology T Peiyun Xu Shugang Li Haifei Lin Yang Ding Haiqing Shuang Sibo Liu Yu Tian Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network
description	The process of underground coal mining fractures the overlying strata and may provide storage and transportation space for gas by changing the roof rock permeability, which is released by pressure after mining. This paper adopts the experimental method of physical similarity simulation and combines the fractal theory to study the permeability characteristics of the fracture network after mining, and it establishes the fractal permeability equation of pressure-relief gas. The results of the study show that the fracture opening shows a positive correlation with the overburden permeability, whereas the tortuosity of the fracture shows a negative correlation with the overburden permeability. The shape of the high permeability area in the fracture network is found to be similar to the hat-shaped elliptical parabolic zone. In the process of permeability evolution, the key layer structure of the overburden rock is considered as the main factor that affects the trend of change in permeability. Furthermore, based on the above research results, this study developed a targeted design of high-level boreholes in the experimental face and reversed the permeability changes around the drainage borehole. The average error between the actual measured value and the theoretically calculated value is found to be 8.11%. The theoretical model and the permeability evolution law obtained from the research results can provide valuable references and insights into further research on the pressure-relief gas flow model in the goaf.
format	article
author	Peiyun Xu Shugang Li Haifei Lin Yang Ding Haiqing Shuang Sibo Liu Yu Tian
author_facet	Peiyun Xu Shugang Li Haifei Lin Yang Ding Haiqing Shuang Sibo Liu Yu Tian
author_sort	Peiyun Xu
title	Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network
title_short	Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network
title_full	Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network
title_fullStr	Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network
title_full_unstemmed	Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network
title_sort	fractal characterization of pressure-relief gas permeability evolution in a mining fracture network
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/35bbeac36d0c4d7ebba15b12bb54e3d3
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Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network

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