Characteristics of mining gas channel and gas flow properties of overlying stratum in high intensity mining
Abstract：According to the breakage and fracture developing of overlying strata, the layer with fracture diameter of more than 10-1 mm is the mining gas channels development area. Based on the theory of voussoir beam structure, the characteristic of gas channel development in the overburden under the key stratum was studied, and the identification method of the gas pattern were established for gas flow in gas channel based on Kozeny-Carman criterion. Then the overlying rock was divided into turbulent channel area, transitional circulation channel area and seepage channel area, according to the gas pattern in gas channels,and the artificial diversion method for transitional circulation channel area was set up by taking high level suction roadway as main means. Finally, the evolution law of gas channel and its influ- ence on gas guidance flow was inversed by field test at working face 80201 in Xinjing Coal Mine of Yangquan Coal In- dustry (Group) Co. ,Ltd. ,and the gas pattern was classified for transitional circulation channel area,which verified the correction and rationality of the theoretical method and the classification for mining gas channel proposed in this paper.
Keywords：high intensity miningmining gas channelgas flow characteristicsgas patternkey stratum
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 1437-1443 )