Exploring the effect of pore shape on mechanical properties of porous rock-like materials under uniaxial compression via DEM
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The pore shape is a crucial factor affecting the mechanical properties and failure characteristics of porous rock-like materials. This paper quantitatively analyzes the effects of the angularity and aspect ratio of pores on the mechanical properties of porous rock-like materials under uniaxial compression via the Discrete Element Method (DEM). Numerical models containing pores of various shapes were constructed as Voronoi polygon aggregates to more realistically reflect material fracture. The results indicate that as either angularity or aspect ratio increases, the uniaxial compressive strength and elastic modulus decrease in distinct patterns, while Poisson's ratio remains constant. Additionally, an increase in angularity or aspect ratio not only causes cracks to initiate at the sharp corner and make the crack deviate from the axial loading direction, but also results in an increase in the total length of cracks and the number of fragments. Finally, the evolution of the microstructure, including contact forces and the spatial distribution of stress, was evaluated to investigate the impact of pore shape on microscopic characteristics.