Method for generating two-dimensional high-volume-fraction earth-rock mixed material geometric model

Abstract

The invention discloses a method for generating a geometric model of a two-dimensional high-volume-fraction earth-rock mixed material, which comprises the following steps of: firstly, generating randomly distributed particles in any shape according to a grading curve; performing Minkowski sum operation on the particles, and controlling the minimum gap between the adjacent particles; achieving transition from particles to clusters by an overlapped discrete element cluster method, and randomly placing the particles in a certain area; assigning a linear contact model, performing DEM simulation, separating overlapped clusters, and recording initial positions, displacement and rotation of the clusters; and finally, reconstructing the model based on the displacement and rotation information. The theoretical maximum volume fraction of any particle shape is easy to obtain, meanwhile, the boundary distribution problem of the particles and the contact problem between the particles are solved, in addition, the periodic boundary condition in the DEM provides a simple implementation method for the periodic microstructure, the generated model better conforms to the actual situation. Reliability of a subsequent numerical method test research result can be improved, and the method has relatively high application significance.

Description

technical field [0001] The invention belongs to the technical field of research on mechanical parameters of inhomogeneous rock-soil materials, and in particular relates to a method for generating a two-dimensional high-volume-fraction earth-rock mixture geometric model based on a discrete element method (DEM) for generating material numerical model test blocks. Background technique [0002] The numerical method to study the mechanical parameters of heterogeneous rock and soil materials (such as concrete and accumulation bodies) has developed rapidly in recent years. This type of method can well overcome the difficulty of sampling, sample disturbance, and discrete results in the study of real test parameters. The size of the test is too large, and the test scale is too small compared with the internal structure scale. However, there is a big problem in the study of heterogeneous material parameters by numerical methods: the problem of model establishment, that is, to generate...

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Problems solved by technology

However, there is a big problem in the study of heterogeneous material parameters by numerical methods: the problem of model establishment, that is, to generate values ​​that meet the requirements of numerical experiments according to various internal structural parameters of the accumulation body (such as: aggregate gradation in concrete, aggregate shape, etc.) model test block

However, the current method of generating a two-dimensional high volume fraction particle volume model has some disadvantages. When generating a high volume fraction aggregate model, the efficiency is not high and it takes a long time. The particles are not allowed to be placed on the boundary, which will affect the modeling. accuracy of results

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