Abstract
Rock bolts have been widely employed on slopes as a reinforcement measure. Modeling the shear mechanical behaviors of bolted rock joints is very complicated due to the complex factors that affect the axial and shear forces on the bolts. The rough surface of the joint surface undergoes a dilation effect and morphological abrasion under shearing. However, existing analysis models do not fully consider these effects. This study proposes an analytical model for predicting the shear behaviors of bolted rough joints. The model considers the relationship between the dilation effect and the bolt deformation and the influence of joint surface abrasion on the attenuation of the internal friction angle. Moreover, the axial force development is corrected at a bolt installation angle of 90 degrees, and the effect of the initial normal stress of the joint surface on the deformation and fracture of the bolt is also considered. The analysis model successfully predicts the shear load-shear displacement curve of the anchoring joint and the change curve of the anchor shaft force. The analysis model is verified by an indoor direct shear test. The validation shows that the proposed model can effectively describe the deformation characteristics of the bolts in shear tests.
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