Citation

Guo H. China Saf. Sci. J. 2019; 29(3): 108-113.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.03.018

PMID

unavailable

Abstract

The paper aims to study temporal-spatial evolution features of outburst prevention effect in protective layer mining area and provide the basis for determining gas drainage parameters and mining sequence. A mechanical modle for underlying rock stress (deformation) was established to carry out the numerical simulation. The spatiotemporal distribution of parameters of protected coal seam was investigated. The results show that main factors influencing spatiotemporal distribution of protection effect are rock quality and structure, coal seam mining thickness and length of mining face, that the distribution of stress of protected coal seam is W-shaped and that of deformation is M-shaped, that with the change of mining face position, the gas pressure firstly increases and then decreases, while the expansion rate and permeability firstly decrease and then increase, and that the change of coal deformation lags behind the advancing of mining face position, which shows the creep characteristics of the coal deformation. © 2019 China Safety Science Journal. All rights reserved.

Language: zh