The research macro-mechanical properties of rock based on discrete particle model

4th International Conference on Advanced Composite Materials and Manufacturing Engineering 2017

材料科学;化学

Zhang, Luchen^1 ; Li, Shuchen^1 ; Zhao, Shisen^1 ; Liao, Qikai^1

Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, SHANDONG

250061, China^1

关键词: Connection strength;    Discrete particle models;    Friction coefficients;    Laboratory experiments;    Macroscopic mechanical properties;    Microscopic parameter;    Numerical calculation;    Particle contacts;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/207/1/012092/pdf
DOI  :  10.1088/1757-899X/207/1/012092

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The influences of different microscopic parameters of the macroscopic mechanical properties are not the same. Based on discrete element granular flow theory, particle contact stiffness, friction coefficient, connection strength and other microscopic parameters of the material properties of macroscopic mechanical properties are analyzed combined with laboratory experiments. Using triaxial test to study IV surrounding rock specimen under different mechanical properties. Based on discrete element granular flow theory, using PFC2D to analyze the relationship between different microscopic parameters and macroscopic mechanical properties. It is found that particle contact stiffness has great influence on the peak strength, macroscopic initial tangent modulus and elastic modulus; With the increase of the friction coefficient between the particles, the peak strength increases; connection strength is greater, the greater the material cohesion and Poisson's ratio is smaller. Research results may reflect the influences of microscopic parameters on the macroscopic mechanical properties of materials, and provide a basis for the selection of microscopic parameters in the numerical calculation.