A Simulation Method of General Numerical Simulation Box for 3D Discrete Element Rapid Modeling of Rock and Soil Mass

Abstract

The invention discloses a universal simulation box used for three-dimensional discrete element modeling and simulation of a rock and soil mass. 1) a universal simulation box is established, specified-size boundary plates in six directions of a box body are generated, the boundary plates are composed of a series of sphere particles, smaller-size buffer boundary pressure plates are respectively generated inside the six boundary plates, and the three-dimensional simulation box is established; 2) a particle accumulation body is generated in the box body, and no-gravity particles are randomly generated in the box body; 3) a three-dimensional model of different structures is established, files including delamination and demarcation coordinate files are imported, the particles outside an outlineare removed, and the three-dimensional model of the structures is formed; 4) material properties of the rock and soil mass are assigned to the three-dimensional model, a material attribute file of therock and soil mass is imported, parameters of the rock and soil mass are converted into parameters of the particles according to conversion formulas, the parameters are assigned to the particles, anda three-dimensional discrete element model with specified elastic properties and failure properties is established; and 5) loading of force, displacement and vibration is carried out through the boundary pressure plates, displacement and vibration are applied through boundaries, loads such as stress action are applied through the pressure plates, iteration operating is carried out, and a result is output.

Description

technical field

[0001] The invention relates to three-dimensional discrete element simulation of rock and soil, in particular to an efficient modeling method and a multifunctional three-dimensional simulation box. Background technique

[0002] Many problems in the field of geotechnical engineering and geological engineering involve large deformation and failure, such as landslides, collapses, land subsidence, tunnel excavation, hydraulic fracturing, etc. Most of the current simulation methods for rock and soil structures are based on continuum mechanics (such as finite element method, finite difference method). On the microscopic level, rock and soil is a structural system composed of a series of particles, pores, and cracks. These methods are difficult to effectively simulate this discreteness, as well as large deformation and failure. The discrete element numerical simulation method is based on a large number of spherical particles for calculation, and is an effective mea...

Examples

Embodiment Construction

[0010] The working process of the inventive method is as Figure 1-Figure 4 shown.

[0011] figure 1 Flowchart of the implementation of the generic simulation box modeling and simulation method for 3D discrete element models.

[0012] Step 10 Input the geometric parameters of the three-dimensional simulation box to establish the outer contour of the simulation box, including the outer boundary plate and the inner boundary pressure plate. Both plates are composed of spherical particles with a particle size similar to that of the sample, and the boundary plate is rigid. , to apply boundary displacement, and the pressure plate is flexible to buffer boundary displacement and generate pressure.

[0013] Step 11 creates a close-packed body. Close-packed heaps are created by gravity deposition and cyclic compaction.

[0014] Step 12 assigns geometric conditions. According to the geometric shape and layered boundary conditions of the structure, the external coordinate file is rea...

technical field

[0001] The invention relates to three-dimensional discrete element simulation of rock and soil, in particular to an efficient modeling method and a multifunctional three-dimensional simulation box. Background technique

[0002] Many problems in the field of geotechnical engineering and geological engineering involve large deformation and failure, such as landslides, collapses, land subsidence, tunnel excavation, hydraulic fracturing, etc. Most of the current simulation methods for rock and soil structures are based on continuum mechanics (such as finite element method, finite difference method). On the microscopic level, rock and soil is a structural system composed of a series of particles, pores, and cracks. These methods are difficult to effectively simulate this discreteness, as well as large deformation and failure. The discrete element numerical simulation method is based on a large number of spherical particles for calculation, and is an effective mea...

Examples

Embodiment Construction

[0010] The working process of the inventive method is as Figure 1-Figure 4 shown.

[0011] figure 1 Flowchart of the implementation of the generic simulation box modeling and simulation method for 3D discrete element models.

[0012] Step 10 Input the geometric parameters of the three-dimensional simulation box to establish the outer contour of the simulation box, including the outer boundary plate and the inner boundary pressure plate. Both plates are composed of spherical particles with a particle size similar to that of the sample, and the boundary plate is rigid. , to apply boundary displacement, and the pressure plate is flexible to buffer boundary displacement and generate pressure.

[0013] Step 11 creates a close-packed body. Close-packed heaps are created by gravity deposition and cyclic compaction.

[0014] Step 12 assigns geometric conditions. According to the geometric shape and layered boundary conditions of the structure, the external coordinate file is rea...

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