Deformation and heat transfer modelfor surrounding rock in thick loose layer-extra thick coal seam working face

By using theoretical analysis and numerical calculation, the mechanical properties of the surrounding rock of the thick loose layer and extra thick coal seam comprehensive discharge face were deeply studied. The multi-parameter critical control equation for the sudden change of the roof plate along the working face was derived, and the influence of variables such as fracture block degree, rotation angle, breaking angle, friction factor and corner end extrusion coefficient on the stability of the roof ?rotation-slide? was obtained. A heat transfer model for the broken layers under the underground ventilation is proposed. This study has great significance for the safe mining and high yield and efficiency of the mine.