Size Effect on the Rheological Shear Mechanical Behaviors of Different Joints: A Numerical Study

Under the condition of constant external stress, displacement and stress joint will be adjusted continuously with time, resulting in creep phenomenon, that is, continuous increase strain which further causes damage jointed rock mass. In order to study size effect shear rheological mechanical properties, this paper conducted numerical simulations on nonpenetrating penetrating models established Particle Flow Code (PFC) analyzed specimen behavior model. The results show following: (1) For direct test, instantaneous increases as increases, showing a significant positive effect. (2) through-type joints, only cohesion shows certain effect, strength friction angle have nonobvious relation size. (3) anchored model leads decrease strength, while angle-size joints is not remarkable.