Experimental and numerical investigation on crack mechanism of folded flawed rock-like material under uniaxial compression

Fan, Wenchen; Yang, Hui; Jiang, Xueliang; Cao, Ping

doi:10.1016/j.enggeo.2021.106210

Cited by 48 publications

(10 citation statements)

References 44 publications

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“…and numerical studies have been carried out on rock or rock-like specimens containing different defects under different loading conditions. 2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] These studies show that the initiation, propagation, and coalescence of preexisting defects are the main causes of rock engineering instability. Therefore, it is important to deeply study the rock failure mechanism caused by preexisting defects.…”

mentioning

confidence: 87%

“…The presence of defects can significantly deteriorate the stability of a rock mass 2,3 . To investigate the effect of defects on the mechanical behavior of rocks, a large number of theoretical, experimental, and numerical studies have been carried out on rock or rock‐like specimens containing different defects under different loading conditions 2 , 4–20 . These studies show that the initiation, propagation, and coalescence of preexisting defects are the main causes of rock engineering instability.…”

Section: Introductionmentioning

confidence: 99%

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A novel quantitative explanation for the fracture mechanism of sandstone containing a circular inclusion

Zhang

Bao

et al. 2023

Fatigue Fract Eng Mat Struct

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In this study, uniaxial compressive tests combined with the digital image correlation (DIC) method are used to investigate the mechanical properties, fracture process, and failure pattern of sandstone containing a circular inclusion. A DIC‐based methodology is proposed to quantitatively explain the crack initiation and propagation mechanism. The identification criterion of crack type is presented based on the nature of cracks and the development trends of relative displacement. Three crack types, including tensile cracks, tensile–shear cracks, and shear cracks, with different cracking mechanisms are identified. The inhibitory effect of the inclusions on crack initiation and propagation is revealed. The inclusion–matrix debonding mechanism is further investigated, and it is found that the inclusion interface consists of tensile concentration zones on the left/right sides and compressive concentration zones on the top/bottom sides. The tensile concentration zone is the main reason for debonding of the inclusions from the sandstone matrix.

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confidence: 87%

Section: Introductionmentioning

confidence: 99%

A novel quantitative explanation for the fracture mechanism of sandstone containing a circular inclusion

Zhang

Bao

et al. 2023

Fatigue Fract Eng Mat Struct

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“…These models typically simplify the physical properties or the force of the rock for analysis purposes [ 7 ]. However, discontinuities exist widely in natural rock masses [ 8 ], and the intact rocks are separated by different types of structural planes. In other words, the rock masses have different heterogeneity because of the macroscopic structural planes and microscopic structural planes in the rock mass.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, advanced techniques offer us chances to attain a more practical and even real-time development of microstructure, e.g., acoustic emission (AE) detection [ 10 , 11 ], the scanning electron microscope (SEM) [ 12 ], X-ray micro-computed tomography (CT) [ 13 , 14 ]. As for crack propagation, many scholars have conducted laboratory experiments with natural crack rock and rock-like materials [ 5 , 8 , 15 , 16 ]. At present, the widely used numerical simulation methods in geomechanics can be divided into continuum analysis and non-continuum analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Overall, laboratory experiments are usually interfered with by many factors, time-consuming and laborious. In addition, those non-destructive, advanced techniques are expensive, while the numerical simulation method, as a useful supplement, has many advantages: the numerical simulation method is efficient, cost-effective, repeatable, and the transient states of fracture development can be captured [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Failure Behavior of Brittle Heterogeneous Rock under Uniaxial Compression Test

Liu

Guo

et al. 2022

Materials

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Rocks have formed heterogeneous characteristics after experiencing complex natural geological processes. Studying the heterogeneity of rocks is significant for rock mechanics. In this study, a linear parallel bond model with Weibull distribution in two-dimensional particle flow code (PFC2D) is adopted to study the mechanical characteristics and brittle failure mode of granite rock specimens with different heterogeneity. Firstly, we selected several combinations of key micro-parameters of the parallel bond model. Then, we subjected them to a Weibull distribution to satisfy heterogeneity, respectively. Finally, we chose one optimal combination plan after comparing the stress–strain curves of heterogeneous rock specimens. We analyzed the simulated results of heterogeneous rock specimens. The crack distribution of rock specimens under peak stress shows different characteristics: a diagonal shape in rock specimens with low heterogeneity indexes, or a rotated “y” shape in rock specimens with high heterogeneity indexes. As for failure mode, the numerical simulation results show high consistency with the laboratory experiment results. The rock specimen breaks down almost diagonally, and the whole specimen tends to form an x-shaped conjugate shear failure or the well-known “hour-glass” failure mode. With the increase of the homogeneity index of the rock specimen, the shear rupture angle becomes larger and larger. Generally, the crack number increases with time, and when the rock specimen reaches the peak failure point, the number of cracks increases sharply. The development of cracks in numerical rock specimens under compression test is a result of the coalescence of many microscopic cracks. Furthermore, tensile cracks formed initially, followed by shear behavior along the macroscopic crack plane. We also preliminarily study the mechanical characteristics of heterogeneous rock specimens with discontinuous structural planes. The discontinuous structural planes are simulated by the smooth-joint model. We can conclude that the discontinuous structural planes and the microscopic structural planes which contribute to the heterogeneity have a mutual influence on each other.

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Numerical investigation on the influence of secondary flaw lengths on the mechanical characteristics and cracking behaviour of red sandstone containing orthogonal cross flaws

Xu,

Dou,

Zhao

et al. 2024

Num Anal Meth Geomechanics

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Flaw length has a significant effect on the cracking behaviour of fractured rock. PFC2D was used to simulate the uniaxial compression of red sandstone samples with secondary flaw lengths L2 of 0 mm, 5 mm, 10 mm, 15 and 20 mm under different primary flaw angles α(α = 0°, 15°, 30°, 45°, 60°, 75°, and 90°). Based on the simulation results, the effects of the secondary flaw length on the mechanical parameters, crack initiation location and crack evolution process of the fractured rock were analysed. Then, a method for judging the initiation location of the first cracks was proposed. Finally, the characteristics of the particle displacement field at preexisting flaw tips during first and secondary crack initiation were analysed. The results of this study are helpful for more deeply understanding the cracking behaviour of fractured rock.

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Experimental and numerical investigation on crack mechanism of folded flawed rock-like material under uniaxial compression

Cited by 48 publications

References 44 publications

A novel quantitative explanation for the fracture mechanism of sandstone containing a circular inclusion

A novel quantitative explanation for the fracture mechanism of sandstone containing a circular inclusion

Numerical Simulation of Failure Behavior of Brittle Heterogeneous Rock under Uniaxial Compression Test

Numerical investigation on the influence of secondary flaw lengths on the mechanical characteristics and cracking behaviour of red sandstone containing orthogonal cross flaws

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