Simulation investigation of mechanical and failure characteristics of jointed rock with different shapes of joint asperities under compression loading

With the increase in the number of rock engineering projects, it has been recognized that the influence of joints on compressive damage of rock mass cannot be ignored. The existence of joints in the rock mass having complex surface configurations significantly influences its damage properties. Hence...

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Bibliographic Details
Published in:Computational particle mechanics 2023-02, Vol.10 (1), p.45-59
Main Authors: Yan, Ya-tao, Wang, Si-wei
Format: Article
Language:English
Subjects:
Asperity
Classical and Continuum Physics
Compression loads
Computational Science and Engineering
Configurations
Damage
Deformation effects
Degradation
Engineering
Failure modes
Jointed rock
Mechanical properties
Modulus of elasticity
Rectangles
Rock masses
Shape effects
Theoretical and Applied Mechanics
Trapezoids
Triangles
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Summary:With the increase in the number of rock engineering projects, it has been recognized that the influence of joints on compressive damage of rock mass cannot be ignored. The existence of joints in the rock mass having complex surface configurations significantly influences its damage properties. Hence, a particle flow code (PFC2D) was used to investigate the effects of joint surface configuration on mechanical properties of jointed rock when compressed. In this study, a hybrid model with parallel bond model (PBM) and flat-joint model (FJM) was applied to simulate granite material and the complex surface configuration was simplified into four types of shapes (i.e., rectangle, trapezoid, ellipse and triangle). The shape effect on deformation and failure modes of jointed rock was discussed. The numerical results show that joint asperity diminished mechanical property of jointed rock and is prone to damage. It is reflected that strength and elastic modulus markedly decreased and asperity degradation. In addition, because of the asperity asynchronous degradation, the joint surface exhibited inconsistent displacement. The joint asperity shape affected the failure properties of jointed rock. Three failure modes of the joint asperities were observed. Finally, the shape feature of the asperities (angle, radius ratios and side length) on the deformation and degradation of joint asperity was discussed.
ISSN:2196-4378
2196-4386
DOI:10.1007/s40571-022-00477-7