Fracturing In and Around a Natural Discontinuity in Rock: A Comparison between Boundary and Discrete Element Models

Debecker, Bjorn; Vervoort, André; Napier, J.A.L.

doi:10.4203/ccp.84.168

Cited by 2 publications

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“…However, during the Brazilian test, a small eccentricity of the axial load may cause large non-uniformities of stress in specimens [24], or stress concentrations may be induced by caps. For transversely isotropic rock masses, failure under the Brazilian test is not necessarily a pure tensile failure; in some cases, it can even be pure shear failure, but it is often a combination of both tensile and shear failure [25][26][27]. Although these disadvantages are obviously present in the Brazilian test, it is still widely used in laboratory experimental and numerical studies to investigate the tensile properties of transversely isotropic rocks [28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Tensile Properties and Tensile Failure Criteria of Layered Rocks

et al. 2022

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Rocks are less resistant to tension than to compression or shear. Tension cracks commonly initiate compression or shear failure. The mechanical behavior of layered rocks under compression has been studied extensively, whereas the tensile behavior still remains uncertain. In this paper, we study the effect of layer orientation on the strength and failure patterns of layered rocks under direct and indirect tension through experimental and numerical testing (RFPA2D: numerical software of Rock Failure Process Analysis). The results suggest that the dip angle of the bedding planes significantly affects the tensile strength, failure patterns, and progressive deformation of layered rocks. The failure modes of the layered specimens indicate that the tensile strength obtained by the Brazilian disc test is not as accurate as that obtained by the direct tension test. Therefore, the modified Single Plane of Weakness (MSPW) failure criterion is proposed to predict the tensile strength of the layered rocks based on the failure modes of direct tension. The analytical predictions of the MSPW failure criterion agrees closely with the experimental and numerical results. In rock engineering, the MSPW failure criterion can conveniently predict the tensile strength and reflect the failure modes of layered rocks (such as shale, slate, and layered sandstone) with satisfactory accuracy.

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Section: Introductionmentioning

confidence: 99%

Tensile Properties and Tensile Failure Criteria of Layered Rocks

et al. 2022

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“…UDEC is a two-dimensional numerical program based on the distinct element method for discontinuity modelling. It has been widely used in the literature to explore damage of rock [24][25][26][27][28][29], as well as Brazilian test analysis [30,31]. UDEC especially joint model used in UDEC captures several features that are representative of the physical response of joints.…”

Section: Introduction About Distinct Elementmentioning

confidence: 99%

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Dai

Zhang

2018

Shock and Vibration

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To investigate the crack behaviour of rock or rock-like material in uniaxial loading, a series of numerical simulations were conducted on gypsum specimens containing a single flaw with different inclination angle (0 ∘ -90 ∘ ) and length (10 mm-30 mm). Based on the numerical simulations results, the effect of flaw length on peak strength, the CI stress, and the CD stress were investigated with different inclination angles. The results show that the peak strength decreased initially and then increased with increasing of the flaw angle. Meanwhile, the peak strength decreased gradually when the length of the preexisting flaw increased. When the inclination angle was 30 ∘ , 45 ∘ , and 60 ∘ , the reduction degree of peak strength increased with increasing of the flaw length. The CI stress and CD stress not only depend on the inclination angle but also depend on flaw length. Four types of crack were observed in numerical simulations. The present research facilitates increased understanding of crack behaviour of rock under different conditions.

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Fracturing In and Around a Natural Discontinuity in Rock: A Comparison between Boundary and Discrete Element Models

Cited by 2 publications

References 0 publications

Tensile Properties and Tensile Failure Criteria of Layered Rocks

Tensile Properties and Tensile Failure Criteria of Layered Rocks

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

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