Rock mesoscopic numerical model generation method and system capable of avoiding malformation calculation unit

Abstract

The invention provides a rock mesoscopic numerical model generation method and system capable of avoiding a malformation calculation unit, and the method comprises the steps: 1, obtaining the microscopic image features of a rock sample through numerical image processing, carrying out random point scattering based on a point saturation theory in a spatial domain, extracting the spatial position ofmineral particles, carrying out Voronoi diagram-based spatial region division on the particle aggregate in the boundary of the rock sample to generate a Voronoi polygon, and simulating a mesoscopic geometric structure of irregular shapes of mineral particles; 2, calculating a centroid coordinate of the polygon according to geometric information of the polygon, and carrying out spatial subdivisionagain by adopting a centroid iteration method until a set iteration stop standard is met; replacing all short edges of the mineral particles with short edge midpoints, and regenerating a rock mineralparticle model; and 3, performing finite element mesh generation on the model, and inserting thickness-free interface units into particle boundaries and the interior of the particle boundaries to generate a finite element numerical model capable of simulating rock cracking.

Description

technical field [0001] The invention belongs to the field of rock mechanics research, and in particular relates to a method and a system for generating a rock mesoscopic numerical model capable of avoiding deformity calculation units. [0002] technical background [0003] Rocks are mineral aggregates with a certain structure formed by geological processes in nature. Due to the influence of internal mineral grains, pores and cementing materials and other mesoscopic structures, the mechanical properties and deformation and failure laws of rocks present their uniqueness and uniqueness. Complexity. A large number of experiments and numerical simulations have shown that the macroscopic mechanical properties of rocks are closely related to their microstructures, and the size, shape, interlocking degree and contact type of mineral particles can all affect the mechanical properties of rocks. From the perspective of mineral grain size, in igneous rocks, metamorphic rocks and sedimen...

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Problems solved by technology

[0005] However, in the above rock mesoscopic model generation method, the number of mineral particles generally needs to be controlled between 200 and 2000, resulting in limited calculation accuracy; moreover, there are many deformed mineral particles, and it is easy to generate deformed units and over-dense meshes during the meshing process. grid, which leads to a decrease in calculation efficiency and calculation accuracy, and even the phenomenon that the simulation does n

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