Citation

Tian S, Ma R, Zou Y, Xu S, Lin H, Yu Z. China Saf. Sci. J. 2020; 30(3): 82-86.

Copyright

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

DOI

10.16265/j.cnki.issn1003-3033.2020.03.013

PMID

unavailable

Abstract

In order to accurately measure the width of stress-relief zone ahead of roadway working face, borehole gas continuous flow method was proposed based on the relationship between gas flow discharged from coals and in-suit stress, and its feasibility was verified theoretically. Then, borehole gas flow was measured in 2303 ventilating roadway of Xuehu coal mine by using outburst prediction device. The results show that gas flow increases first and then decreases with its peak being the boundary of stress-relief zone, and the width of the zone ahead of working face is determined to be 9-10 meter. Meanwhile, that measured by using drillings amount and drillings gas absorption index Δh2 is 9.5 - 10 meter, consistent with results of borehole gas continuous flow method, therefore verifying its reliability in determining width of stress-relief zone. © 2020 China Safety Science Journal. All rights reserved.

Language: zh