Failure of transversely isotropic rock under Brazilian test conditions

Experimental and theoretical study of the anisotropic properties of shale

“…In many cases, for transversely isotropic rock materials, the fracture pattern is more complicated and composed of mixed-mode fractures along the weak planes and the matrix, which is different from the isotropic rocks. This is the main reason for the maximum failure strength is not obtained in the direction perpendicular to the bedding planes for transversely isotropy rocks [53,54].…”

Discrete element modeling of anisotropic rock under Brazilian test conditions

“…16 DEM model can reproduce mechanical properties of both soft and hard rocks by modifying the micro-parameters. As the main purpose of this study is to model the behaviors of inherently anisotropic rocks, a dimensionless analysis was first carried out to investigate the effect of weak layers properties.…”

“…[11][12][13][14][15] In general, the failure of anisotropic rocks under diametrical compression is very complex in terms of fracture mode and direction. Vervoort et al 16 generalized the experimental results of nine different anisotropic rocks into four trends of the Brazilian tensile strength (BTS) which are normalized by the strength for loading perpendicularly to weak planes versus anisotropy angles as illustrated in Fig. 1.…”

“…16. However, possible important parameters (including the strength of weak layers, ratio between tensile strength and cohesion, and anisotropic Young's modulus) and the ways in which they can affect variations of strength and fractures were not investigated in detail.…”

Influence of Bedding Planes on the Mechanical Characteristics and Fracture Pattern of Transversely Isotropic Rocks in Direct Shear Tests

“…Liao et al conducted a series of direct tensile tests on argillite to study the tensile properties of transversely isotropic rocks [16]. Vervoort and Tavallali [17][18][19] studied the induced fracture patterns during Brazilian tests of various transversely isotropic rock materials. However, all the studies mentioned above focused on the anisotropy of the strength and elastic deformation parameters and the fracture characteristics under compression or tension.…”