Study on the deformation and strength characteristics of hard rock under true triaxial stress state using bonded-particle model
Deformation and strength characteristics of granite under true triaxial stress states () are studied using 3D discrete element method (DEM). Lode angle and the minimum principal stress are kept constant during each test by using distortional periodic boundary, eliminating the end effect and isolating the effect of intermediate principal stress . Results reveal significant effect of on the common mechanical behavior and magnitude distribution of acoustic emission events. Based on a three-invariant strength criterion, variations of the instantaneous internal friction angle upon failure give an explanation for the effect on peak strength, which can be explained additionally by the energy release quantified as b-value.
Keywords: Discrete element method, Hard rocks, Intermediate principal stress, Peak strength, Dilatancy, Magnitude distribution,