Effects of Crushing Characteristics on Rheological Characteristics of Particle Systems

Abstract

A particle system’s large-deformation shear flow exhibits obvious random characteristics, making accurate modeling of the particle system difficult. Particle systems, which are frequently used in engineering, are prone to breakage, which introduces additional uncertainty into the system. The purpose of this study was to conduct ring-shear experiments on a variety of common engineering materials in order to quantify the effect of the dynamic crushing process of the particle system on the instability of shear flow. Different shear fracture characteristics may result in a change in the volume trend of the system, from dilatancy to shrinkage. While the mean value of the crushable system’s stress ratio does not increase with shear rate, the stress ratio’s fluctuation characteristic parameters are negatively correlated with shear rate. As particles become more easily sheared, the initial value of the stress ratio fluctuation increases. The effect of shear rate on the fluctuation in the system stress ratio is determined indirectly by the degree of system fragmentation. The study of the particle system’s fluctuation characteristics will aid in developing a stochastic dynamic model for the landslide system in the future, allowing for improved prediction and prevention of landslide disasters.

Effect of Particle Form and Surface Friction on Macroscopic Shear Flow Friction in Particle Flow System

“…Figure 1 shows the experimental equipment, materials and zonal filling method. This figure is modified from a previously published article by the author [24]. After completing the zonal filling, normal stress was applied to achieve system pre-consolidation and retain strong particle contact.…”

“…Figure 1 shows the experimental equipment, materials and zonal filling method. This figure is modified from a previously published article by the author [24].…”

“…Lu et al [23] conducted a discrete element simulation of overland flow and demonstrated that there exists a considerable correlation between the dynamic characteristic fluctuation of the particle flow system and the system particle size. Huang et al [24] conducted a series of ring shear experiments to investigate the relationship between particle fragmentation and the fluctuations in the macroscopic shear behavior of particle flow systems. However, the source of the variation in the flow properties of a particle system has not been elucidated to date, and experimental data are lacking.…”