Coal wall mechanical environment of high cutting face in steeply dipping seam is complex,which might become instable,in order to better prevent and control coal wall instability,it is urgent to gain a clear idea of coal wall mechanics and deformation features. The coal wall mechanics,deformation features of 25221 high cutting face in steeply dipping seam are analyzed by field measurement,numerical calculation and theoretical analysis,results show that,abutment pressure in space affects high coal wall of ste...