Citation

Zou S, Xin S. China Saf. Sci. J. 2020; 30(4): 53-59.

Copyright

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

DOI

10.16265/j.cnki.issn1003-3033.2020.04.009

PMID

unavailable

Abstract

In order to predict effective extraction radius of drilling hole in gas control of coal mine, taking No. 6 coal seam of Sijichun mine in Guizhou Province as an example, a gas seepage model of surrounding units of boreholes was established. Then, gas pressure distribution cloud chart along radial direction at different drilling time was obtained through Comsol numerical simulation. Finally, effective extraction radius was determined based on theoretical derivation and numerical simulation data while considering critical gas pressure (0. 5 MPa), and verification was made with on-site test. The results show that relative error rate of theoretical and simulated effective extraction radius is less than 10%, verifying accuracy of both calculation results. Effective radius is linearly dependent on extraction time. Considering its complexity to measure effective radius on site, it can be obtained through theoretical and numerical simulation methods used in this paper, which provides a theoretical basis for underground gas control. © 2019 China Safety Science Journal

Language: zh