Abstract: Roof collapse is one of serious and normal engineering disaster in the underground exploitation process of metal mine. Aiming at the rock properties of layered roof of Sinosteel Group Cangshan Iron Mine, destroy process of strata and influence law of each factors were analyzed. 3-D numerical mechanical analysis model was established by using FLAC3D software. The stress-strain analysis was done on roof, changing destroy law of roof in condition of different delamination-terrane thickness and buried depth and other factors under depth of 50~300 m were studied through numerical analysis software.

Key words: Hard Rock, Layered structure roof, Mechanical structure model, FLAC^3D