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

Abstract

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.