ABSTRACT
Rock materials are often subjected to cyclic loadings in earthquakes, so it is necessary to investigate the cyclic properties of different rocks for evaluating the stability in rock engineering. The classical plastic mechanics is impossible to describe the plastic deformation in the yield surface and cannot explain the hysteresis loops and the accumulative plastic deformation of rock materials in the cyclic loading process. Based on the Drucker-Prager (D-P) yield criterion and sub-loading surface theory, the sub-loading surface stress path model was established to simulate the deformation properties of rock materials under cyclic loading through self-programming. The cyclic deformation characteristics of different rocks with various mechanical properties were analyzed. The results show that the effect of cohesion and internal friction angle on the size of hysteresis, the cumulative plastic deformation and similar ratio of the model is greater than that of the elastic modulus and Poisson’s ratio.
