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

doi:10.1016/j.egyr.2021.10.080

	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
	Wang, Wei 5,6; Zhang, Jianwei 5,6; Chen, Xiangjun 4; Liu, Yanwei 4; Li, Hong 3; Wang, Haifeng 2; Fang, Zhiming 1
刊名	ENERGY REPORTS
	2021-11-01
卷号	7 页码:8834-8848
关键词	Directional long borehole Roof extraction roadway Fractured zone Reasonable position Annular-shaped fractured zone
ISSN号	2352-4847
DOI	10.1016/j.egyr.2021.10.080
英文摘要	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. (C) 2021 The Authors. Published by Elsevier Ltd.
资助项目	National Key Research and Development Program of China[2018YFB0605601] ; National Natural Science Foundation of China[51774119] ; primary research projects of critical scientific research projects in Henan Colleges and Universities[19zx003]
WOS研究方向	Energy & Fuels
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000727748600009
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28328]
专题	中科院武汉岩土力学所
通讯作者	Zhang, Jianwei
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.China Univ Min & Technol, Fac Safety Engn, Xuzhou 221001, Jiangsu, Peoples R China 3.Henan Univ Engn, Sch Safety Engn, Zhengzhou 451191, Peoples R China 4.Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454000, Henan, Peoples R China 5.Henan Prov Res Ctr Engn Intelligent Construct Rai, Kaifeng 475004, Peoples R China 6.Henan Univ, Sch Civil Engn & Architecture, Kaifeng 475004, Peoples R China
推荐引用方式 GB/T 7714	Wang, Wei,Zhang, Jianwei,Chen, Xiangjun,et al. 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[J]. ENERGY REPORTS,2021,7:8834-8848.
APA	Wang, Wei.,Zhang, Jianwei.,Chen, Xiangjun.,Liu, Yanwei.,Li, Hong.,...&Fang, Zhiming.(2021).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.ENERGY REPORTS,7,8834-8848.
MLA	Wang, Wei,et al."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".ENERGY REPORTS 7(2021):8834-8848.