The Simulation of Rockfill in a Characteristic of Three-Dimensional Strength

Abstract

To study the three-dimensional strength characteristics of rockfill material under an anisotropic state, the anisotropic state variables were introduced into the Mohr-Coulomb failure criterion, and the failure criterion describing the three-dimensional strength of rockfill which was obtained in linear form in this paper. The anisotropic state variables were established with the fabric of rockfill particles. Based on the experimental results of a large triaxial consolidated drained test, fractal dimension theory was introduced to study the relationship between strength and deformation characteristics under different gradation and confining pressures. The experimental results and simulation have shown that: (1) The fractal theory can be used to quantitatively describe the rockfill particles crushing with all kinds of grades under different stress levels. (2) The fabric of rockfill particles was closely related to the three-dimensional strength characteristics. (3) The anisotropic state variables can describe the three-dimensional strength characteristics of rockfill well from a microscopic perspective. 1 INTRODUCTION Rockfill was a common engineering material extensively used in hydraulic, railway, transportation, and other basic engineering construction. It showed different strength characteristics in the macroscopic affecting the stability of the structure. Therefore, the strength characteristics of rockfill materials have attracted the attention of the engineering and academic circles under different stress paths [1-2]. To study the strength characteristics of rockfill, many researchers carried a lot of large-scale triaxial test research. Studies have shown that void [3] , stress level and density [4] , confining pressure [5] , particle crushing [6] ,