Study On The Mechanism Of Strong Strata Behavior In Partitional Mining Of Nanliang Coal Mine

The shallow coal seam has the characteristics of shallow buried depth, thin bedrock thick cover, heavy soil, It’s rock pressure in coal face always different with other coal seam, Pressure of workface are strong,so as to shallow coal seam, It’s still a difficult problem at present to control the coal face pressure. But the key strata structural morphology in shallow coal seam re-mining and the movement characteristics of breaking are the important factor to judge the severe degree of pressure manifestation, it’s also the premise to master the mechanism of strong strata behavior in lower coal seam. As to the shallow seam has single key stratum that the up seam has been mined, when the key stratum fractured structure is in an unstable state after the coal seam is mined, the lower key strata structural morphology prone to sliding instability, the pressure of workface is very stronger, the workface prone to step subsidence and crushing accident.NanLiang coal mine located in the mine area of ShenFu XinMin,the 2-2 and 3-1 coal seam are the main mineable seams,the average distance between the two seams was 20 meters,the 2-2 coal seam use the longwall mining method and the room-pillar mining method,the 3-1 coal seam adopts the longwall mining method.Aiming at the Shendong mining area of shallow buried close distance coal seam repeated mining easy to appear the characteristics of dynamic load of mine pressure, using NanLiang coal mine as engineering background, Using the spot investigation, the similar material simulation experiment, theoretical analysis and numerical simulation, To carry out the study on overburden strata structure failure mechanism of repeated mining of shallow coal seam mining in the close coal seams, Determine the NanLiang coal mine partitional mining influence factors to the lower coal seam pressure, Nan Liang coal mine close coal seams partitional mining overlying strata structure of control instability and measures are put forward, to avoid the strong strata behavior influence the normal production...