a study on particle stress evolution in biaxial test

Abstract eng:
This paper examines the evolution of particle stress inside uncrushable granular materials in biaxial test using DEM and probabilistic method. It is found that the magnitude of normalized maximum shear stress inside particles have a nearly unified probability distribution at different loading stages, while the orientation shows increasing anisotropy with the rising of stress ratio. For samples with different initial void ratios but the same grading, the magnitude of normalized maximum shear stress probability density function can be approximately expressed by a two-parameter Weibull distribution function, in which the scale parameter and shape parameter are affected by sample grading, showing better grading samples having lower probability of high maximum shear stress. Second order Fourier series can be used to approximate probability density functions of the maximum shear stress orientation.

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