Abstract:Granular materials are composed of a large number of discrete particles with different particle shapes, and their mechanical properties are closely related to the particle shape of the particle system. At present, the macro and micro properties of non spherical granular materials under complex stress paths are not fully understood. A series of constant-σ₃ constant-b true triaxial tests on ellipsoid particles system with a certain gradation are carried out by using the discrete element method (DEM), and the elongation of ellipsoid particles η is changed to reflect the effects of particle shape on the macro-mechanical properties, and the applicability of the commonly used three-dimensional strength criteria to the ellipsoid particle system is verified. The results show that under the three-dimensional loading path, different from the consistency of the macro and micro evolution laws of the spherical particle system, the evolution laws of the macro stress surface and the micro fabric surface of the