Study on hysteretic deformation characteristics and energy dissipation of granite under cyclic loading

Abstract

Abstract The cyclic load test of granite under different paths is conducted using the strain control method. The nonlinear hysteretic deformation behavior is analyzed, and the energy evolution law in the process is described in detail. Three specific discoveries were made. (1) The skeleton curve shape in the cyclic test is less affected by the increase in the upper load limit and shows good loading memory characteristics. (2) The hysteretic characteristics of the stress-strain curve characterize the energy dissipation process. Dissipated energy is divided into plastic hysteresis and damping energy consumption. Damping energy consumption accounts for a considerable proportion of the total energy consumption at all levels, and the changing trend of the two is positively correlated. The upper limit of the cyclic load can significantly change the plastic hysteretic energy. (3) The loading-unloading process is more prone to large hysteresis deformation, and the unloading-reloading process has an unloading threshold. When the unloading amount is less than the threshold, the unloading-reloading curve linearly coincides, and the energy is dissipated during the process. When the unloading amount is greater than the threshold, damping energy will be generated to increase energy dissipation, and the hysteresis characteristic will appear.