Abstract: The shear stress distribution function of grouted rock bolt is set up based on the interface between bolt and wallrock mass and following the Coulomb-Mohr yield criterion.On this basis,the distribution functions of the shear stress and axial load of the grouted rock bolt in wallrock under the actual stress are set up based on the mechanism of interaction between wallrock mass and grouted rock bolt.Meanwhile,a computing formula of neutral point is set up according to the concept of neutral point.The effects of various factors on the actual stress of bolt are analyzed in detail,providing a certain theoretical basis for analyzing its reinforcement mechanism.

Key words: Rock Mechanics, Grouted rock bolt, Reinforcement Mechanism