An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression

Lee, Heekwang; Jeon, Seokwon

doi:10.1016/j.ijsolstr.2010.12.001

Cited by 636 publications

(248 citation statements)

References 37 publications

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“…To understand the initiation and propagation of cracks in rock many researchers [1][2][3][4][5] conducted study based on laboratory experiments and numerical analysis. Most of them studied the brittle behavior in rock and found some common crack behaviour when subjected to loading.…”

Section: Studies On Crack Initiation and Propagationmentioning

confidence: 99%

“…3. A study by [3] presents crack initiation, propagation and coalescence at or Both experimental and numerical results are expected to improve the understanding of the characteristics of cracking and crack coalescence and can be used to analyze the stability of rock and rock structures, such as underground openings/slopes and tunneling constructions, where preexisting cracks or fractures play a crucial role in the overall integrity of the structures. Crack initiation and propagation in rocks has tremendous application in Hydro fracking.…”

Section: Studies On Crack Initiation and Propagationmentioning

confidence: 99%

“…Based on the literature [1][2][3], gypsum is found to be an ideal model rock with which a wide range of brittle rocks can be represented and eases of preparing a significant number of specimens in a reasonable period. The experimental study is carried to confirm the effectiveness numerical model while capturing crack initiation and propagation in a specimen with pre-existing flaw.…”

Section: Experimental Studiesmentioning

confidence: 99%

“…The gypsum sample is prepared [3] having dimensions of 76 mm (width) × 152 mm (height) with a thickness varying from 25 mm to 30 mm and flaw size of 12.5 mm (length). To prepare this sample of this size a mold set up is fabricated and flaw is created with metal shims while casting.…”

Section: Experimental Studiesmentioning

confidence: 99%

“…With the recent development in the numerical analysis, the study can be extended from intact rock properties to jointed rock material by considering the presence of the flaws/cracks. Many researchers attempted to study the rock having cracks and developed model based on the fracture mechanics concept [1][2][3][4][5][6][7]. The theory of fracture mechanics is useful to study the presence of the cracks and their effects on material property values.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of crack propagation in rocks by XFEM

Sivakumar¹,

Maji²

2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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Abstract-Understanding the failure mode and crack propagation in rock can provide useful information for safe and economic design of various structures in rock. Many researchers have developed theoretical criteria for rock failure with crack growth based on experimental observations. Numerically using cohesive zone model for brittle material with an assumption of some plasticity is found to be a good approach to predict the crack growth in rocks. The cohesive zone model is popularly used for fracture simulation in brittle materials, uses traction-separation law. The tractionseparation law represents the material damage zone in front of the crack tip where the material elements are pulled apart. The extended finite element method (XFEM) enhanced the capability of the classical finite element method capturing the crack propagation problems. The important feature of XFEM is that, it can extend the crack without any remeshing which makes it suitable for fracture process analysis. The present paper combines XFEM approach with cohesive zone model (CZM) to analyze the crack growth for rock using ABAQUS. The results of the analysis are compared with the experiments carried out in the laboratory and with available literatures on crack growth in rocks. The present paper demonstrates different crack types (tensile/shear) that gets initiated from the pre-existing flaw with respect to the applied loading. The numerical model using ABAQUS shows a good agreement with the theoretical and experimental results while predicting the crack propagation.

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Section: Studies On Crack Initiation and Propagationmentioning

confidence: 99%

Section: Studies On Crack Initiation and Propagationmentioning

confidence: 99%

Section: Experimental Studiesmentioning

confidence: 99%

Section: Experimental Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simulation of crack propagation in rocks by XFEM

Sivakumar¹,

Maji²

2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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An analytical solution of direction evolution of crack growth during progressive failure in brittle rocks

Li,

Yan

et al. 2024

Deep Underground Science and Engineering

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Microcrack growth during progressive compressive failure in brittle rocks strongly influences the safety of deep underground engineering. The external shear stress τxy on brittle rocks greatly affects microcrack growth and progressive failure. However, the theoretical mechanism of the growth direction evolution of the newly generated wing crack during progressive failure has rarely been studied. A novel analytical method is proposed to evaluate the shear stress effect on the progressive compressive failure and microcrack growth direction in brittle rocks. This model consists of the wing crack growth model under the principal compressive stresses, the direction correlation of the general stress, the principal stress and the initial microcrack inclination, and the relationship between the wing crack length and strain. The shear stress effect on the relationship between y‐direction stress and wing crack growth and the relationship between y‐direction stress and y‐direction strain are analyzed. The shear stress effect on the wing crack growth direction during the progressive compressive failure is determined. The initial crack angle effect on the y‐direction peak stress and the wing crack growth direction during the progressive compressive failure considering shear stress is also discussed. A crucial conclusion is that the direction of wing crack growth has a U‐shaped variation with the growth of the wing crack. The rationality of the analytical results is verified by an experiment and from numerical results. The study results provide theoretical support for the evaluation of the safety and stability of surrounding rocks in deep underground engineering.

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A review of mechanical deformation and seepage mechanism of rock with filled joints

Yue,

Li,

Liu

et al. 2024

Deep Underground Science and Engineering

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Various defects exist in natural rock masses, with filled joints being a vital factor complicating both the mechanical characteristics and seepage mechanisms of the rock mass. Filled jointed rocks usually show mechanical properties that are weaker than those of intact rocks but stronger than those of rocks with fractures. The shape of the rock, filling material, prefabricated fissure geometry, fissure roughness, fissure inclination angle, and other factors mainly influence the mechanical and seepage properties. This paper systematically reviews the research progress and findings on filled rock joints, focusing on three key aspects: mechanical properties, seepage properties, and flow properties under mechanical response. First, the study emphasizes the effects of prefabricated defects (shape, size, filling material, inclination angle, and other factors) on the mechanical properties of the rock. The fracture extension behavior of rock masses is revealed by the stress state of rocks with filled joints under uniaxial compression, using advanced auxiliary test techniques. Second, the seepage properties of rocks with filled joints are discussed and summarized through theoretical analysis, experimental research, and numerical simulations, focusing on organizing the seepage equations of these rocks. The study also considers the form of failure under stress–seepage coupling for both fully filled and partially filled fissured rocks. Finally, the limitations in the current research on the rock with filled joints are pointed out. It is emphasized that the specimens should more closely resemble real conditions, the analysis of mechanical indexes should be multi‐parameterized, the construction of the seepage model should be refined, and the engineering coupling application should be multi‐field–multiphase.

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An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression

Cited by 636 publications

References 37 publications

Simulation of crack propagation in rocks by XFEM

Simulation of crack propagation in rocks by XFEM

An analytical solution of direction evolution of crack growth during progressive failure in brittle rocks

A review of mechanical deformation and seepage mechanism of rock with filled joints

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