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The Brazilian splitting test is a widely used testing procedure forcharacterizing the tensile strength of natural rock or rock-like material dueto the fact. However, the results of Brazilian tests on specimens withnaturally existing voids and inclusions are strongly influenced by size effectsand boundary conditions, while numerical modeling can assist in explaining andunderstanding the mechanisms. On the other hand, the potential of utilizingBrazilian test to characterize inhomogeneous deformation of rock samples withvoids and inclusions of dissimilar materials still awaits to be explored. Inthe present study, fracture mechanisms in Brazilian discs with circular voidsand filled inclusions are investigated by using the phase field model (PFM).The PFM is implemented within the framework of finite element method to studythe influence of diameter, eccentricity, and quantity of the voids andinclusions on the fracture patterns and stress-strain curves. The phase fieldsimulations can reproduce previous experimental phenomena and furthermore itdeepens the understanding of the influence of inclusion and voids on thefracture pattern, overall strength and deformation behavior of inhomogeneousrock. The findings in the study highlight the potential of characterizinginhomogeneous rock through combining Brazilian tests and numerical modeling.

Phase Field Characterization of Rock Fractures in Brazilian Splitting Test Specimens Containing Voids and Inclusions