Study of mining subsidence control under different mining-filling methods

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 diffe rent mining methods was put forward. The experiment study and the numerical simulation were applied to analyze the surface subsidence in the mining area though diff erent miningilling methods. The results showed that the rate of roof-contact would be raised if some bentonite was put into the flling materials. If the method of strip m ining 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 stabil ity of coal pillar could be maintained. If the pillar was replaced fully, the flling height should be reached 4. 5 m that was equal to the mining height, which was enough to ensure the stability of flling body for a long time. If 20 m pillar was replaced, the flling height could be reached 4. 3 m and the strength of flling body could reach to 7. . 41 MPa, Which could maintain the stability of the flling body for a long term.