ABSTRACT: A new model of joint shear strength under cyclic loads is proposed. In the model, the joint roughness is divided into two parts: primary roughness and high order roughness. During the cyclic shear, the high order roughness will be sheared off gradually subjected to an exponential damage function, but the primary roughness will remain. The model is then implemented into the discrete element code, UDEC, by modifying the existed Coulomb slip criteria. A verification study on the model is carried out which indicates that the model is able to model the joint shear behavior including offset phenomenon, roughness damage and dilation under cyclic shear. Finally, the model is extended for dynamic analyses.

You can access this article if you purchase or spend a download.