Determination the cutting height of top-coal caving with great mining height in extra thick coal seam

摘要

With the aim to overcome the difficulty of determining the reasonable cutting height, the influence factors of determining the cutting height were analyzed in detail.Combined with the Panel 30101 of some mine, the stability of coal wall, the working resistance of support, the top-coal migration and recovery at different cutting height are studied by using numerical simulation and field practice.The result shows that the stability of coal wall, the support working resistance, top-coal migration positively correlate with the cutting height, which is not a linear relation, with the increase of cutting height, the top-coal recovery shows a trend of increases first and then decrease.Overall considering that the stability of coal wall, the working resistance of support, the top-coal migration and recovery, the determination a cutting height of 5 m for the Panel 30101 is reasonable.