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Method for constructing an irregular sand particle model based on discrete element simulation

A construction method and irregular technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problems of particle shape difference, single elliptical particle shape, etc., to achieve the effect of simplifying the modeling method

Inactive Publication Date: 2018-10-26
HUBEI UNIV OF TECH
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Problems solved by technology

At present, when many researchers use the particle flow discrete element method to analyze the rock and soil structure, they regard the sand in the model as spherical (disc-shaped) particles, which is inconsistent with the extremely irregular shape of the sand in reality. Scholars use the "Clump" method to construct various types of non-circular particle units. Generally, three disk particles are used to construct elliptical clump particles in shape. Significant difference between real sand and soil

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  • Method for constructing an irregular sand particle model based on discrete element simulation
  • Method for constructing an irregular sand particle model based on discrete element simulation
  • Method for constructing an irregular sand particle model based on discrete element simulation

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Embodiment Construction

[0079] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0080] see Figure 5 , the present invention provides a method for building an irregular sand particle model based on discrete element simulation, comprising the following steps:

[0081] (1) The sand in the embankment filling is determined by sieving the gradation of sand particles, and the screened sand particles with a particle size greater than 4.75mm are photographed to obtain the digital data of the sand particles with a particle size greater than 4.75mm photo;

[0082] (2) In the embankment filler, it is coarse-grained material greater than 4.75 mm. Use IPP6.0 image processing software to convert the digital image of sand particles with a particle size greater than 4.75 mm in step (1) into a binary image (such as figure 1 shown), a Cartesian coordinate system is established through a binary image, where the horizontal axis is the boun...

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Abstract

A method for constructing an irregular sand particle model based on discrete element simulation includes the steps of: carrying out statistical analysis on sand particles with particle size greater than 4.75 mm, obtaining a statistical law related to sand particle shape characteristics, establishing a statistical model, and determining relevant parameter value of sand particle shape distribution;according to the random distribution law of sand particles in the actual embankment filling, obtaining the distribution characteristics of sand particles such as azimuth angle and center position coordinate; performing secondary development on PFC2D3.0 by FISH language according to the parameters of sand particle shape distribution and the characteristics of sand particle distribution, and realizing the establishment of the random sand particle model. The invention uses the built-in FISH language programming to realize that the two-dimensional model of the sand particle is more in line with the actual sand particle shape when simulating, and the large-grain sand particle discrete element modeling is determined by the sand shape rule, so as to achieve the purpose of adopting the discrete element method to analyze the meso-mechanical characteristics of the sand particle.

Description

technical field [0001] The invention relates to a two-dimensional discrete element simulation technology for roadbed filling, in particular to a method for constructing an irregular sand particle model based on discrete element simulation. Background technique [0002] The discrete element method is based on the theory of discontinuous medium mechanics, with a single block or particle as the basic unit, and there is no need to satisfy the displacement continuity and deformation coordination conditions between the units. It is suitable for solving the discontinuous deformation of rock and soil, and has been widely used in In geotechnical engineering. At present, when many researchers use the particle flow discrete element method to analyze the rock and soil structure, they regard the sand in the model as spherical (disc-shaped) particles, which is inconsistent with the extremely irregular shape of the sand in reality. Scholars use the "Clump" method to construct various type...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 马强吴峰肖衡林库准邓谦陈智胡智刘一鸣张晋付佩
Owner HUBEI UNIV OF TECH
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