Citation

Zang Z, Li Z, Niu Y, Liu S, Song J, Zhang Q. China Saf. Sci. J. 2021; 31(3): 90-95.

Copyright

(Copyright © 2021, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2021.03.013

PMID

unavailable

Abstract

In order to study influence of gas on mechanical properties of coal, a uniaxial compression test of coal under different gas pressure was designed. Change trend of coal samples' mechanical parameters and deformation characteristics along with gas pressure was studied to explore influence mechanism of gas on their mechanical properties, their parameters under uniaxial compression were obtained, and failure mode was recorded. The results show that with increase of gas pressure, compaction stage of stress-strain curve increases while elastic stage decreases, and the curve decreases slowly after instability failure. Meanwhile, compressive strength and elastic modulus decrease monotonously while peak strain increases monotonously. Cracks of coals with no gas produced under load are relatively simple, but gas-containing coal samples, after being damaged under load, see obvious main cracks and multi-directional bifurcation cracks as well as partial coal body shedding. © 2021 China Safety Science Journal

Language: zh