Abstract: In view of the safety accidents caused by overlaying rock movement in the overlaying process of highdip coal seam,such as support toppling,conveyor sliding and roof crushing,etc.,take the 10428C working face of Huozhou coal electricity group co.LTD.Xinzhi coal mine as an example,FLAC3D numerical simulation software was used to analyze the mining characteristics of roof strata along the strike and tendency of working face.Results show that no matter along the strike or tendency of the working face,the vertical stress contour and displacement contour of the largeangle underhand stoping coal seam are asymmetric arch form.The support pressure and displacement value under the working face are greater than above generally,the overlying strata movement range expands rapidly in the middle and upper part.The plastic failure zone of the roof of the working face develops toward the roof,the damage range of the lower roof of the working face increases obviously.

Key words: Steeply inclined coal seam,Strata movement,Numerical simulation,Deformation