An analytical model of fully grouted rock bolts subjected to tensile load

An analytical model for fully encapsulated rock bolts subjected to tensile load in pull-out tests is presented. This model is based on the bond-slip relationship describing the mechanical interaction at the bolt-grout interface. The model takes into account the residual shear stress in addition to the complete decoupling mechanisms. Formulations are also derived for the load-displacement curve, shear stress distribution at the bolt-joint interface and axial load distribution in the bolt. The model was validated with experimental results from both the laboratory experiments and in situ studies.