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Numerical Investigation of Failure Mode Transitions in Rock Specimens Containing Non-persistent Joints Under Compression-Shear Conditions
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Numerical Investigation of Failure Mode Transitions in Rock Specimens Containing Non-persistent Joints Under Compression-Shear Conditions
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Journal Article
Numerical Investigation of Failure Mode Transitions in Rock Specimens Containing Non-persistent Joints Under Compression-Shear Conditions
2024
Overview
Normal stress (σn) under compression-shear conditions significantly affects crack propagation and failure modes of specimens containing non-persistent joints (NPJs). Crack propagation and failure modes of specimens vary for different σn. In the present study, we adopt a strength-based local maximum stress criterion (SLMS) to describe tensile and shear cracks formed during shear and model crack propagation processes via the finite element method. Two classical cases are performed to validate the SLMS criterion for describing tensile and shear cracks under shear conditions. After that, crack initiation, propagation, and coalescence processes are modeled for specimens containing a pair of horizontal NPJs in coplanar and non-coplanar cases at different σn. Variations of crack propagation and failure modes of specimens containing coplanar and non-coplanar NPJs are investigated for σn ranging from low to high. Effects of rock bridge inclination angle (β) on crack propagation and failure mode of specimens containing non-coplanar NPJs are investigated. Also, the effects of σn on critical shear load (τsc) for crack initiation in specimens containing coplanar and non-coplanar NPJs are examined. Results indicate that failure modes of specimens with coplanar NPJs transform from tensile to mixed tensile-shear, then to shear, and finally to pure shear as σn increases. The increase of β promotes the appearance of tensile failure of specimens containing coplanar NPJs under high σn while suppressing the appearance of shear failure. The modeling results provide a reference for understanding crack propagation and failure modes in rocks containing NPJs under compression-shear conditions.
