Overlying rock movement law simulation of local filling of gangue in longwall mining areas of large dip angle coal seam
In order to further explore the characteristics of overlying rock movement in the roof of a working face under min-ing conditions of high dip coal seams,a certain high dip coal seam of the Teaching Second Mine was taken as a research case,and FLAC3D numerical simulation software was used to build a numerical model of mining face.Through controlling variable experimental method,the five typical conditions of no filling,filling of 1/5,filling of 1/3,filling of 1/2 and filling of 2/3 were selected to carry out the analysis of roof displacement,stress distribution and plastic characteristics.The results show that reasonable increasing of filling ration is conducive to reduction of the stress and displacement of overlying rock strata and decreasing of the failure range of coal seam roof.At the same time,the extending of working face's length has a negative effect on the mechanical performance of roof.Eventually,a reasonable parameter combination is determined with the filling ration of 2/3,and the working face length of 75 m.
large dip angle coal seamcoal ganguethe movement law of rock layerssimulation analysis
万方数据
维普
