id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
esrj-91378	Xie, Xiaoping ; Fang, Xinqiu ; Liang, Minfu ; Ai, Dechun 	Geological evolution process, mechanism, and application of protective layer in semi-coal and rock face	2021	8	.pdf	application/pdf	6348	223	53	Keywords: Semi-coal rock; Geological Evolution; Non-coal pillar; Distressed blind-zone; Gas extraction. J. Vol. 24, No. 4 (December, 2020): 499-506 Xiaoping Xie1,2, Xinqiu Fang1*, Minfu Liang1,3, Dechun Ai2 1State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China 2College of Mining and Civil Engineering, Liupanshui Normal University, Liupanshui 553004, China 3School of Management, China University of Mining and Technology, Xuzhou 221116, China” *Corresponding author: 264580414@qq.com M IN IN G E NG IN EE RI NG 500 Xiaoping Xie, Xinqiu Fang, Minfu Liang, Dechun Ai Introduction When the roadway excavation section has both rock and coal seam, and when the coal seam occupies 1/5 to 4/5 of the area of the excavation face, it is called semi-coal-rock mining working seam, which generally exists in thin coal seam conditions.	cache/esrj-91378.pdf	txt/esrj-91378.txt