Numerical analysis of confinement effect on crack propagation mechanism from a flaw in a pre-cracked rock under compression

Manouchehrian, Amin; Marji, Mohammad Fatehi

doi:10.1007/s10409-012-0145-0

Cited by 80 publications

(25 citation statements)

References 31 publications

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“…e classical fracture mechanics approach considers that the propagation of cracks in the material is highly dependent on the stress intensity. According to the maximum tensile stress theory, when the tensile stress σ 1 at the crack tip exceeds the critical value, the crack begins to propagate [31].…”

Section: Analysis Of Crack Propagationmentioning

confidence: 99%

Microcrack Growth Properties of Granite under Ultrasonic High-Frequency Excitation

Zhao

Zhang

Wang

2019

Advances in Civil Engineering

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The failure of most rock materials is essentially a process of crack initiation and propagation. It is of great significance to study the microcrack growth characteristics of granite under ultrasonic high-frequency excitation for understanding the failure mechanism of rock under ultrasonic vibration. In this paper, the experimental and numerical simulation methods are used to study the propagation characteristics of rock cracks under ultrasonic vibration. Scanning electron microscopy (SEM) was used to observe the growth of microcracks in granite samples after ultrasonic vibration for 0 min, 2 min, and 4 min. A discrete element software PFC2D was used to simulate and solve the cracking mechanism of rock cracks under ultrasonic vibration. Also, it is found that the action of ultrasonic vibration can effectively promote the development of microcracks in the granite samples. The main three cracks causing the failure of quartz under the ultrasonic high frequency are intragranular cracks, transgranular cracks, and grain boundary cracks. The breakage of transgranular cracks usually contributes a shell-like fracture, that is, a regular curved surface with a concentric circular pattern appears on the fracture surface, which is a typical quartz brittle fracture mode. In addition, the feldspar grain failure is mainly caused by intragranular crack and transgranular crack. Microcracks are wavy expansion in feldspar grain. Mica failure is mainly caused by grain boundary crack, and the effect of lamellar cleavage on the failure of mica is significant. Moreover, it is also found that the mechanism of microcrack propagation is tensile failure. The failure of feldspar grains is mainly contributed to the failure of granite.

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Section: Analysis Of Crack Propagationmentioning

confidence: 99%

Microcrack Growth Properties of Granite under Ultrasonic High-Frequency Excitation

Zhao

Zhang

Wang

2019

Advances in Civil Engineering

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“…In recent years, many numerical methods have been widely used in rock mechanics and rock engineering. ese include the FEM or XFEM [144][145][146][147][148][149][150][151], DDA [152][153][154][155], NMM [156][157][158], smoothed particle hydrodynamics [159][160][161][162], and PFC [17,[163][164][165][166][167][168][169][170][171][172]. Overall, most of the numerical results show good agreement with experimental results.…”

Section: Numerical Simulationmentioning

confidence: 82%

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock-Like Specimens: A Review

Cao

Lin

Fan

et al. 2019

Advances in Civil Engineering

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Rock masses are heterogeneous materials containing a large number of discontinuities, and the failure of the natural rock mass is induced by the crack propagation and coalescence of discontinuities, especially for the rock mass around tunnel or underground space. Because the deformation or failure process of jointed rock mass exhibits strongly nonlinear characteristics, it is also very difficult to predict the strength and failure modes of the rock mass. Therefore, it is very necessary to study the failure mechanisms of jointed rock mass under different stress conditions. Apart from the stress condition, the discontinuities geometry also has a significant influence on the mechanical behavior of jointed rock mass. Then, substantial, experimental, and numerical efforts have been devoted to the study of crack initiation, propagation, and coalescence of rock or rock-like specimens containing different kinds of joints or fissures. The purpose of this review is to discuss the development and the contribution of the experiment test and numerical simulation in failure behavior of jointed rock or rock-like specimens. Overall, this review can be classified into three parts. It begins by briefly explaining the significance of studying these topics. Afterwards, the experimental and numerical studies on the strength, deformation, and failure characteristics of jointed rock or rock-like materials are carried out and discussed.

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“…At the same time, the vertical load and displacement of the specimen were also monitored. [42,44,45], it has been viewed as an effective and realistic method for modeling rocks [36][37][38][39]. Therefore, the parallel bond model is used to model multiple-jointed rock-like specimens in the current work.…”

Section: Laboratory Testsmentioning

confidence: 99%

“…Many kinds of numerical simulation methods have been successfully employed for such topics, including FEM [25][26][27][28][29][30], DDA [31][32][33][34], and NMM [32,35]. Currently, PFC (particle flow code), that is, a kind of DEM, has been widely accepted and used by many scholars to study the propagation of cracks in natural rocks or rock-like materials [36][37][38][39][40][41]. Previous studies have promoted the understanding of crack propagation, coalescence, and failure modes of jointed rocks.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Failure Behavior and Energy Mechanics of Rock-Like Materials Containing Multiple Joints

Cao

Lin

2017

Advances in Materials Science and Engineering

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This paper investigates the influence of joint geometry parameters on the characteristic stress, failure pattern, and energy mechanism of multiple jointed rock-like specimens under uniaxial compression. Both the laboratory and numerical results show that the higher value of UCS occurs when is around 0 ∘ and changes from 15 ∘ to 30 ∘ or when is around 30 ∘ and changes from 45 ∘ to 75 ∘ . However, the lowest value appears when is around 45 ∘ and changes from 15 ∘ to 30 ∘ . The CDiS (critical dilatancy stress) and CIS (crack initiation stress) show a similar tendency to UCS. Moreover, the specimens present different failure modes for various levels of , , and , and the failure mode can be classified into four categories: stepped path failure; failure through parallel plane; failure through cross plane; material failure. In addition, with higher strength, the input energy and strain energy are higher than those with lower strength. Dissipation energy is affected by the failure modes of the specimens. At the same time, when changes from 0.2 to 0.6, the boundary energy, strain energy, and dissipation energy show a decreasing trend.

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Numerical analysis of confinement effect on crack propagation mechanism from a flaw in a pre-cracked rock under compression

Cited by 80 publications

References 31 publications

Microcrack Growth Properties of Granite under Ultrasonic High-Frequency Excitation

Microcrack Growth Properties of Granite under Ultrasonic High-Frequency Excitation

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock-Like Specimens: A Review

Experimental and Numerical Study of Failure Behavior and Energy Mechanics of Rock-Like Materials Containing Multiple Joints

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