Gas Control Effect and Determination on Drainage Location of Directional High Level Long Borehole
LI Jie
Abstract：In order to effectively control the upper corner gas in a goaf,according to the status that directional high level long borehole was applied to drainage the upper corner gas in No.16041 Coal Mining Face in Jiulishan Mine,UDEC software was applied to simulate the plas-tic zone in the overburden strata above a coal mining face.In combination with a site experiment,an optimum drainage location of the direc-tional high level long borehole determined should be within distance of 13~25 m to the roof.The result showed that an average volume frac-tion of the upper corner gas in the coal mining face was reduced from 0.78% to 0.31% and the advancing speed of the coal mining face was improved from 3.6 m/d to 4.8 m/d and was increased by 1.33 times,which could ensure safety mining.
Keywords：directional high level long boreholeupper corner of goafgas controlgas drainage
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 51-53,57 )