Abstract
The microscopic damage of materials will induce changes in the macroscopic mechanical characteristics of rock material. When simulating engineering problems using the discrete element method, to explore the macroscopic mechanical response of rock material, the microscopic parameters that match the macro material characteristics must be obtained. In this paper, the influence of macroscopic mechanical properties of rock materials is studied through the variation of microscopic parameters, and the quantitative relation between macroscopic parameters of rock material is discussed. The results show that, (1) In accordance with the order of influencing factors, the parameters affecting the elastic modulus of the specimen are parallel bond elastic modulus, particle contact modulus, and parallel bond stiffness ratio. (2) The Poisson’s ratio of the specimen was most influenced by the parallel bond stiffness ratio, and their relation was nonlinear. The influence of parallel bond modulus and friction factor on the Poisson’s ratio was negatively correlated. (3) The effect of particle contact stiffness ratio, parallel bond stiffness ratio, and particle contact modulus on the uniaxial compressive strength was less than that of the particle friction factor.
Highlights
Understanding the failure mechanism of rock materials is significant in mechanics theory, underground engineering construction, and geological disaster management [1,2,3,4,5,6,7]
The elastic modulus E of the specimen increased with enlarging elastic modulus of the parallel bond E, particle contact modulus E, and friction factor μ
The analysis showed that the factors that exerted the greatest impact on the specimens’ Poisson’s ratio are the parallel bond stiffness ratio k /k, parallel bond elastic modulus, and particle contact modulus
Summary
Understanding the failure mechanism of rock materials is significant in mechanics theory, underground engineering construction, and geological disaster management [1,2,3,4,5,6,7]. Scholtès [14] investigated the mode I fracture propagation in brittle rocks using numerical simulations based on the discrete element method. The microscopic view of materials and the macroscopic mechanical properties do not correspond with each other, and the rational determination of mechanical parameters has been a constantly difficult aspect in geotechnical engineering [14, 19, 20]. Many scholars have established the qualitative relationship between the microscopic parameters and macroscopic parameters of adhesive particles [8, 21,22,23] These studies mainly consider the influence of microscopic strength. A numerical simulation method of the particle flow discrete element (PFC) is adopted to study the quantitative effects of rock parameters on elastic modulus and strength
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