Citation

Nian J, Gao W, Li R, Wang W. China Saf. Sci. J. 2019; 29(5): 117-123.

Copyright

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

DOI

10.16265/j.cnki.issn1003-3033.2019.05.020

PMID

unavailable

Abstract

The space between boreholes for gas drainage replacing roadway is currently determined on the basis of the experience of buried pipe drainage technology or only on the simulation of gas distribution in goaf, and its reliability is not high. Therefore, with the 2-105 working face of Tenghui mine as an experimental area, the gas concentration distribution in goaf at different hole positions and then the goaf flow field were simulated successively. On account of the gas concentration distribution and the trend of the flow track change, the influence of boreholes on gas in upper corner was analyzed so as to decide the space between boreholes. Finally, the space determined through the simulation was applied to the field test of borehole gas drainage instead of roadway in 2-105 working face, and the field data and simulation results were compared and verified. The results show that the space determined through the simulation can ensure that the gas volume fraction in upper corner is always below 0. 8%, thus solving the problem of corner gas overflow on the 2-105 working face. © 2019 China Safety Science Journal

Language: zh