Citation

Zhao W, Liu F, Shi X, Liu H, Wang Z, Li Z. China Saf. Sci. J. 2022; 32(3): 65-74.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.03.009

PMID

unavailable

Abstract

In order to explore dynamic distribution characteristics of spontaneous combustion zone in goaf, a combination of theoretical analysis, numerical simulation and field measurement were used to study effects of changes in voids, fracture structure and oxidation rate on features of air leakage and oxygen volume fraction distribution, and it was revealed that spontaneous combustion zone of fully mechanized top coal caving changed from the back of goaf to top coal in working face. The results show that the fracture of top coal and void structure of mined-out area change with extension of exposure time due to influence of mining stress and overburden caving lag. Free diffusion air leakage is formed in open field of upper and middle eaves behind the support, and as exposure time of caving coal and rock mass increase, oxygen consumption rate increases, top coal fracture structure develops, caving space in goaf moves up, and internal void structure in middle and lower part declines, leading to the expansion of spontaneous combustion zone from the back of goaf to top coal of fully mechanized mining support. © 2022 China Safety Science Journal. All rights reserved.

Language: zh