Study of mining subsidence control under different mining-filling methods
He Qiang
Han Xinghua
Abstract：Based on the theory and method of surface subsidence on shallow buried coal seam and the key strata theory,mining mode with the combination of different mining methods was put forward.The experiment study and the numerical simulation were applied to analyze the surface subsidence in the mining area though different mining-filling methods.The results showed that the rate of roof-contact would be raised if some bentonite was put into the filling materials.If the method of strip mining was adopted,the mining width and leaving width of the coal pillar would be 25 m.In that case,the surface subsidence could be minimized and the long-term stability of coal pillar could be maintained.If the pillar was replaced fully,the filling height should be reached 4.5 m that was equal to the mining height,which was enough to ensure the stability of filling body for a long time.If 20 m pillar was replaced,the filling height could be reached 4.3 m and the strength of filling body could reach to 7.41 MPa,Which could maintain the stability of the filling body for a long term.
Keywords：mining subsidencespecial paste materialnumerical simulationstrip miningreplacement mining
Publication Date：2017-01-01
Pages：6( 32-36,42 )