Abstract: Fully grouted rock bolts are widely used in mining and civil engineering. In this study, numerical simulation was adopted to study the loading transfer performance of fully grouted rock bolts. First, based on the shear failure behaviour of the interface between the bolt and grout, a bond-slip model considering the residual shear strength was developed. Then, it was incorporated into the structural elements of piles. After that, the experimental pulling tests of rock bolts were carried out to validate the accuracy of this bond-slip model and the corresponding numerical modelling results. Finally, the influence of the residual shear strength, the shear stiffness coefficient and the grouted length on the bolting performance was studied through the validated numerical model. The results showed that the interfacial residual shear strength had a significant effect on the maximum and residual bearing capacity of rock bolts, which cannot be neglected in the test. With the increasing of interfacial shear stiffness coefficient, the maximum bearing capacity of bolts remarkably increased, and meanwhile there is no observable effect on the residual bearing capacity of bolts.

Key words: rock bolting, bond-slip, shear stress, residual shear strength, numerical simulation