The new measuring method for distance of the gas drainage hole and seam permeability
QU Xian-chao
Abstract：On the basis of basic theories of fluid dynamics, gas extraction mechanical mathematical model was built to insure a reasonable distance of the gas drainage hole and discuss the new measuring method of coal seam permeability coefficient. The model was calcutated by using Mathematica software. According to the mathematical model and its solution, deduced the theoretical formula of distance extraction and the coal layer' s gas permeability coefficient. Took the face 15051 of Jiulishan Coal Mine for example which in Jiaozuo City Henan Province, by the gas drainage trial of the coal around the excavation roadway, calculated and verified the parameters of the gas drainage hole and seam permeability, etc. Based on the measure of gas drainage quantity and sub-pressure, the relationship of them was obtained. The exact seepage gas extraction model was founded, and the model can be calculated quickly and exactly by the computer. The application is in good accordance with the actual results.
Keywords：gas drainagedistance of the gas drainagecoal seam permeability
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1470-1474 )