False triaxial shear test discrete element numerical simulation method based on cylinder servo condition

A three-axis shearing and numerical simulation technology, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve the problem of increasing the amount of simulation calculation, long calculation time, lack of randomness and representativeness, etc. Questions to achieve the effect of simple writing, high popularity and easy understanding

Active Publication Date: 2019-07-02
SOUTHEAST UNIV
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Problems solved by technology

The disadvantage of this method is that the sample it simulates is axisymmetric, and it is not random and representative when simulating anisotropic sample materials.
In the simulation, the state change of the overall boundary condition is determined by calculating the contact between each boundary sphere and the material particle. However, due to the large number of boundary condition spheres generated by this method, the calculation amount of the simulation will be greatly increased, resulting in excessive calculation time. long

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  • False triaxial shear test discrete element numerical simulation method based on cylinder servo condition
  • False triaxial shear test discrete element numerical simulation method based on cylinder servo condition
  • False triaxial shear test discrete element numerical simulation method based on cylinder servo condition

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[0040]The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] The present invention designs a pseudo-triaxial shear test discrete element numerical simulation method based on cylinder servo conditions, which is used to simulate the sample confining pressure and axial In order to control the pressure, and then test the shear strength of the discrete material of the rock and soil mass, the practical application includes the following steps.

[0042] step a. Generate samples, According to the discrete material of rock and soil, within the boundary condition of the cylinder, use the RSA method to generate spherical particles or irregular particles that do not touch each other until each particle fills the inner space of the cylinder, and then enter step B.

[0043] In practical applications, if the newly generated particles are in contact with the already generated particles, t...

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Abstract

The invention relates to a false triaxial shear test discrete element numerical simulation method based on a cylinder servo condition. According to the invention, on the basis of a Lamb formula basedon boundary conditions, the rigid boundary condition of the cylinder is assumed to be a thin-wall pipeline, the radius change condition of the rigid boundary condition of the cylinder in the sample consolidation and shearing process is calculated through the pressure difference so as to achieve the effect of servo control over the confining pressure of the sample, and the method is innovative in idea, easy to understand, simple in code writing and high in universality.

Description

technical field [0001] The invention relates to a discrete element numerical simulation method for a pseudo-triaxial shear test based on cylinder servo conditions, and belongs to the technical field of numerical simulation of geotechnical disciplines. Background technique [0002] At present, with the popularization of computer technology, more and more researchers are paying attention to the study of measuring the shear strength of discrete rock and soil materials using numerical simulation methods. Compared with the disadvantages of long laboratory test cycle, time-consuming, large number of personnel, and large expenses, the numerical simulation method can greatly reduce labor costs and test cycle. [0003] In order to simulate the control of confining pressure in the process of consolidation and shear in pseudo-triaxial tests, the first difficulty to be overcome is to solve the calculation of the pressure applied on the cylindrical surface, but this problem is difficult ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2111/10G06F30/23G06F2119/06
Inventor 吴恺
Owner SOUTHEAST UNIV
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