Citation

Chen L, Wang E. China Saf. Sci. J. 2020; 30(12): 79-84.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.12.011

PMID

unavailable

Abstract

In order to accurately identify precursory signals of gas emission, failure tests of coal containing gas under different loading speed were carried out by using gassy coal seepage test system. Stress-gas emission law for different loading speed was analyzed, and gas emission characteristics in process of coal failure were studied according to critical slowing down theory. The results show that gas emission decreases first and then increases along with increase of stress for different loading speed, and before coal failure, gas emission rises obviously whose rising trend is more and more ahead of coal destruction when loading speed improves. Moreover, before coal failure, its gas emission shows characteristics of critical slowing down of variance and autocorrelation coefficient, and relatively larger window length and hysteresis step are conducive to accurately identifying failure signals of coal containing gas. © 2020 China Safety Science Journal. All rights reserved.

Language: zh