Study of a novol cyclic loading-unloading constitutive model of rock based on a developed discrete element program

This study has developed a novel discrete element computation program that enhances the efficiency of model generation by improving internal algorithms and offers high editability. Although existing constitutive models in commercial software are able to simulate rock material, they exhibit noticeable limitations in capturing the cyclic loading-unloading mechanical characteristics of materials. In this research, a cyclic loading-unloading constitutive model that considers damage was developed for rock materials. The numerical outcomes were compared and analyzed with experimental data. Research on three different types of rock demonstrates a high degree of concordance between numerical simulation results and laboratory experiments. The developed constitutive models effectively capture the plastic failure process of rock material under cyclic loading, with stress-strain curves exhibiting hysteresis loops. Compared to traditional discrete element software employing parallel bonding models, this program provides more accurate results, making it more suitable for simulating cyclic loading-unloading performance.