Analysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin

When mining high-rank coals with strong adsorption and weak desorption, the fully mechanized mining face of a thick coal seam under full-seam mining may encounter broken coal, surrounding rock and instantaneous release of large amounts of gas into the mining space from adjacent coal seams due to min...

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Autores principales:	Wei Wang, Jianwei Zhang, Xiangjun Chen, Yanwei Liu, Hong Li, Haifeng Wang, Zhiming Fang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Directional long borehole Roof extraction roadway Fractured zone Reasonable position Annular-shaped fractured zone Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/ef0e1983957c4cb685344c7060480101
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spelling	oai:doaj.org-article:ef0e1983957c4cb685344c70604801012021-12-02T05:01:56ZAnalysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin2352-484710.1016/j.egyr.2021.10.080https://doaj.org/article/ef0e1983957c4cb685344c70604801012021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721010982https://doaj.org/toc/2352-4847When mining high-rank coals with strong adsorption and weak desorption, the fully mechanized mining face of a thick coal seam under full-seam mining may encounter broken coal, surrounding rock and instantaneous release of large amounts of gas into the mining space from adjacent coal seams due to mining stress relief, which is extremely likely to cause gas overrun accidents at the working face. At present, the major gas control method adopted to solve this problem is the directional drainage of the fractured zone in the mining area through a roof extraction roadway (RER). However, the drainage effect is closely related to its horizontal distance from the return airway and its vertical distance from the coal seam roof. Based on the analysis of fracture characteristics in different areas of the overlying strata above the gob, this paper elaborates the extraction mechanism of RER, and employs three methods: RER at different positions, directional long borehole on roof (RDLB) at different horizontal and vertical positions, and numerical simulation of the stress release effect of the overlying rock, to investigate the gas drainage effect in mining area. A method to determine the best drainage location in the gob based on the stress release ratio of the overlying rock is proposed. The results show that either RERs or RDLBs work to conduct directional drainage in the mining area; the best position is 25 m from the return airway of the mining face horizontally and 50–55 m from the coal seam roof vertically. The research methods provide insight for later studies concerning highly gassy mines and coal and gas outburst mines. Moreover, the research results serve as guidance for other mines with similar mining conditions.Wei WangJianwei ZhangXiangjun ChenYanwei LiuHong LiHaifeng WangZhiming FangElsevierarticleDirectional long boreholeRoof extraction roadwayFractured zoneReasonable positionAnnular-shaped fractured zoneElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 8834-8848 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Directional long borehole Roof extraction roadway Fractured zone Reasonable position Annular-shaped fractured zone Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Directional long borehole Roof extraction roadway Fractured zone Reasonable position Annular-shaped fractured zone Electrical engineering. Electronics. Nuclear engineering TK1-9971 Wei Wang Jianwei Zhang Xiangjun Chen Yanwei Liu Hong Li Haifeng Wang Zhiming Fang Analysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin
description	When mining high-rank coals with strong adsorption and weak desorption, the fully mechanized mining face of a thick coal seam under full-seam mining may encounter broken coal, surrounding rock and instantaneous release of large amounts of gas into the mining space from adjacent coal seams due to mining stress relief, which is extremely likely to cause gas overrun accidents at the working face. At present, the major gas control method adopted to solve this problem is the directional drainage of the fractured zone in the mining area through a roof extraction roadway (RER). However, the drainage effect is closely related to its horizontal distance from the return airway and its vertical distance from the coal seam roof. Based on the analysis of fracture characteristics in different areas of the overlying strata above the gob, this paper elaborates the extraction mechanism of RER, and employs three methods: RER at different positions, directional long borehole on roof (RDLB) at different horizontal and vertical positions, and numerical simulation of the stress release effect of the overlying rock, to investigate the gas drainage effect in mining area. A method to determine the best drainage location in the gob based on the stress release ratio of the overlying rock is proposed. The results show that either RERs or RDLBs work to conduct directional drainage in the mining area; the best position is 25 m from the return airway of the mining face horizontally and 50–55 m from the coal seam roof vertically. The research methods provide insight for later studies concerning highly gassy mines and coal and gas outburst mines. Moreover, the research results serve as guidance for other mines with similar mining conditions.
format	article
author	Wei Wang Jianwei Zhang Xiangjun Chen Yanwei Liu Hong Li Haifeng Wang Zhiming Fang
author_facet	Wei Wang Jianwei Zhang Xiangjun Chen Yanwei Liu Hong Li Haifeng Wang Zhiming Fang
author_sort	Wei Wang
title	Analysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin
title_short	Analysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin
title_full	Analysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin
title_fullStr	Analysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin
title_full_unstemmed	Analysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin
title_sort	analysis of proper position of extraction roadway on roof in high-strength gas emission workface: a case study of zhaozhuang coal mine in southern qinshui basin
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/ef0e1983957c4cb685344c7060480101
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Analysis of proper position of extraction roadway on roof in high-strength gas emission workface: A case study of Zhaozhuang coal mine in southern Qinshui Basin

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