Study on stability of underlying room and pillar old goaf in close coal seam and mining of the upper coal seam

Possible issues during mining of the upper coal seam in old goaf of nearby coal seams, including step subsidence, gas overflow in goaf, and roadway around rock fragmentation. Using the Hanjiawa Coal Mine’s upper coal seam mining, which takes place 28 m above the working face of the lower coal seam,...

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Hlavní autoři:	Hongtao Liu, Cheng Hao, Zhiwen Wang, Chong Li, Linfeng Guo, Jialu Liang, Haozhu Wang
Médium:	Artigo
Jazyk:	Inglês
Vydáno:	Frontiers Media S.A. 2023-01-01
Edice:	Frontiers in Earth Science
Témata:	close coal seams upper coal seam mining stability of old goaf stress distribution evolution of plastic zone
On-line přístup:	https://www.frontiersin.org/articles/10.3389/feart.2022.1071250/full
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