Rock crystal structure rapid modeling method based on particle cluster substitution

A technology of crystal structure and modeling method, applied in design optimization/simulation, geometric CAD, etc., can solve problems such as the difficulty of three-dimensional space promotion

Active Publication Date: 2020-04-10
WUHAN UNIV
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Problems solved by technology

However, this method assumes that the grains are geometrically convex polygons, and the grain boundaries can only be kept clear when the inner grains are relatively small.
Moreover, the GBM method for dividing particle clusters into two-dimensional crystal structures is difficult to generalize in three-dimensional space.

Method used

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  • Rock crystal structure rapid modeling method based on particle cluster substitution
  • Rock crystal structure rapid modeling method based on particle cluster substitution
  • Rock crystal structure rapid modeling method based on particle cluster substitution

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Experimental program
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Embodiment

[0056] Construct rock samples that meet the following parameter conditions and perform mesostructure modeling:

[0057] The height of the model calculation area is H=0.24m, and the width is W=0.17m;

[0058] Wall related parameters: elastic modulus E=500e6 Pa, stiffness ratio K rat = 0 and friction coefficient μ = 0;

[0059] Granule (ball) group number N=4, density ρ=2650kg / m 3 , damping coefficient D=0.7;

[0060] Contact model related parameters: elastic modulus E=500e6 Pa, stiffness ratio K rat = 1.5 and coefficient of friction μ = 0.4;

[0061] The ratio of the original particle radius to the particle cluster replacement ball diameter is N=4, and the particle cluster compression coefficient is 0.75;

[0062] The magnification ratio of mechanical parameters of particle cluster grain boundary contact factor=1000;

[0063] The number of material groups S=4 groups, the grain boundary contact group name is "GB_" and the contact model number, the intragranular contact gro...

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Abstract

The invention discloses a rapid rock crystal structure modeling method based on particle cluster substitution, which comprises the following steps: firstly, specifying a model area in PFC (Power Factor Correction) software, establishing a boundary wall of a rock sample, analyzing and setting different put particle groups according to the crystal grain components of the sample, and endowing attribute parameters of a wall body and particles; generating particle clusters by adopting small balls with the radius reduced in equal proportion relative to the radius of original particles to replace theoriginal particles, compressing the particle clusters according to a certain proportion, and then deleting the original particles; after the particle clusters are generated, assigning attribute parameters of the particle clusters, and expanding the particle clusters into a crystal structure through expansion among particles; and finally, grouping the materials according to a contact identification method, and endowing corresponding contact model parameters to finish modeling. Compared with an existing method, rapid modeling of the rock crystal microstructure is achieved through the self-compiled FISH language function, the method is popularized to the three-dimensional space, and the method conforms to the physical process of rock crystal structure formation.

Description

technical field [0001] The invention belongs to the field of numerical simulation of particle flow in rock mechanics, and relates to a rock crystal structure modeling method, in particular to a rock crystal structure rapid modeling method based on particle cluster substitution. Background technique [0002] With the continuous development of rock mass engineering technology, the problems of rock mass mechanics faced by engineering are becoming more and more complex, and the requirements for rock mechanics and its numerical simulation have also shifted from macroscopic to microscopic. The analysis of the mesoscopic structure of rock crystals is an important means to understand the physical and mechanical properties of rocks, and it is of great significance to understand the mesomechanics related to rocks. [0003] Based on previous research, Potyondy invented a method (Grained-base Method, GBM) that can realize the mesoscopic modeling of rock crystal structure. He used the V...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13G06F30/20
Inventor 赵先宇王涛张浩浩刘骞
Owner WUHAN UNIV
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