Field experience and similar material simulation indicate that there is the bending catastrophe phenomenon of anchor roof beam in bolting roadway sometimes. By means of mechanical model analysis
bending catastrophe steady mechanism and equilibrium conditions of anchor roof beam are systematically studied; and the bearing area and horizontal thrust of the anchor roof beam are analyzed
too. It is discovered that anchor roof beam different steady characteristics and different dynamic equilibriums in different stages. The theoretical and engineering value of them are prospected for the presentation and controlling of anchor roof beams.