Research on the Macro-Mesoscopic Response Mechanism of Multisphere Approximated Heteromorphic Tailing Particles

Abstract The shape of tailing particles is essential factors their macroscopic mechanical properties. Scholars have studied the effects controllable factors, such as loading method, confining pressure, and strain rate, on strength sand. However, research particle structure through laboratory tests has proved to be difficult due uncertain discrete distribution. Thus, macro-mesoscopic response heteromorphic rarely investigated. In this paper, using multisphere approximation, numerical simulation triaxial conducted. Nonlinear evolution patterns porosity, internal friction angle, cohesion with variation angularity were investigated flexible boundary program developed in study, which revealed intrinsic relationship between mesostructure mechanism engineering characteristics particles. results showed that (1) changes led rearrangements and, turn, porosity changes. With increased sphericity decreased, deviatoric peak stress accordingly. meantime, softening was more significant exceeded, while cohesive force generally increased. (2) fixed angularity, angle decreased slightly effective pressure (3) shearing process, simulated contact chain different shapes similar. disordered chains gradually undergo directional connection, i.e., reduced number free stressed (4) stress-strain rigid simulations under pressures lower than those simulations. difference insignificant, indicating good feasibility reasonability for behaviors tests. could offer direct insights into mechanisms nonspherical provide references tailings at microscopic levels.