id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ajst-14311	Sun, Rui	Research on the Relief Effect of Coal and Rock in The Protected Layer Under the Mining Action of The Upper Protective Layer	2023	5	.pdf	application/pdf	3340	151	58	Analysis of gas pressure relief effect in coal seam mining with lower protective layer [J]. After the mining of the working face is completed, the vertical stress changes of the goaf floor and coal seams 12 and 13 show the trend shown in Figure 4.	cache/ajst-14311.pdf	txt/ajst-14311.txt