Discrete element combined particle and discrete element stacking test simulation method thereof

Abstract

The invention relates to a discrete element combined particle and a discrete element stacking test simulation method thereof. The discrete element combined particle comprises Clump particles at various degrees of sphericity; each Clump particle is composed of a unit ball A, a unit ball B, a unit ball C and a unit ball D; the unit ball A, the unit ball B and the unit ball C are in equal radius; the unit ball A, the unit ball B and the unit ball C are arrayed on the periphery of the unit ball D in a circumferential distribution form; the unit ball A, the unit ball B and the unit ball C are all tangent or intersected with the unit ball D; and the value n of the degree of sphericity of the Clump particles is more than or equal to 0.33 but less than or equal to 1. According to the invention, a discrete element method is adopted for developing the Clump particles and performing the stacking test simulation; a friction coefficient of the practical particle is directly utilized to simulate the mechanical characteristics of the sand particles according to the statistical result of the degree of sphericity of the particles; the defect of the traditional ball particle adopting a bigger friction coefficient is avoided; and the mechanical property is more approximate to the mechanical property of the practical sand soil.

Description

technical field [0001] The invention relates to a simulated particle and a simulation method for a stacking test, in particular to a discrete element composite particle and a simulated method for a discrete element stacking test. Background technique [0002] Compared with continuum mechanics methods such as finite element method, the discrete element method can consider the bulk characteristics of soil particles, overcome the macro-continuity assumption, and can be well used to solve problems such as soil nonlinearity, and is usually used to simulate bulk The mechanical properties of the medium. For the research on the physical and mechanical properties of sandy soil, the existing research mainly focuses on the influence of particle size and gradation on the macroscopic properties of sandy soil, and the particle size, gradation and shape are the factors that affect the mechanics and deformation of sandy soil. The three extremely important parameters of the characteristics,...

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Problems solved by technology

For the research on the physical and mechanical properties of sandy soil, the existing research mainly focuses on the influence of particle size and gradation on the macroscopic properties of sandy soil, and the particle size, gradation and shape are the factors that affect the mechanics and deformation of sandy soil. The three extremely important parameters of the characteristics, the traditional discrete element method usually uses spherical particles to simulate the sand, which is quite different from the irregular shape of the actual sand, and the spherical particles of the discrete element are difficult to achieve the interlocking of the particles , that is, it is difficult for spherical particles to achieve the occlusal friction characteristics of irregular-shaped natural sand, and the friction coefficient is usually increased to make the final simulation results approach the indoor test, which eventually leads to the set friction coefficient far exceeding the actual value

In addition, using spherical particles to simulate the actual mechanical properties of sand and soil, the occlusal force and rotation angle of the particles during the stress process are significantly smaller than those of non-round particles, which is significantly different from the actual mechanical properties of soil particles with various shapes, and it is difficult to accurately Reveal the mechanical mechanism of sandy soil from the perspective of particle size

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