Study on safety mining technology under goaf of steep inclined coal mining face in seam with close distance

Taking the mining under the goaf of steep inclined coal mining face in seam with a close distance as the study background,the paper analyzed the mechanisms of the coal wall spalling,roof falling,and downward sliding of the hydraulic powered supports and face conveyor.The analysis results showed that the coal pillar left in the goaf of the overlying seam would cause the stress concentration,the secondary mining failure of the coal mining face would enhance the deformation of the coal and rock in the coal mining face and the seam inclination and the floor failure depth would have high influences to the downward sliding of the hydraulic powered supports and face conveyor.Therefore the relevant safety mining control technology was provided to have a safety mining of the coal mining face and to offer a valuable experiences to the safety mining of the coal mining face under the similar conditions.