Crack propagation simulation of rock-like specimen using strain criterion

Zhao, Cheng; Ma, Chuangchuang; Zhao, Chunfeng; Du, Shigui; Bao, Chong Gao

doi:10.1080/19648189.2017.1359677

Cited by 8 publications

(6 citation statements)

References 18 publications

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“…As shown in the left column of Table 2, the failure statuses and crack trajectories of dry cracks are quite similar to the outcomes of uniaxial compression loading tests [39] and numerical simulation results. There was no secondary cracks or anti-wing cracks occurred, but only two primary cracks developed from the crack tips throughout the whole loading processes no matter how large the inclination angle was.…”

Section: Trajectories Of Dry Crackssupporting

confidence: 65%

“…Based on the above judgement criteria, the tensile fracture and shear fracture can be separated easily and accurately on a micro scale using SEM system, and this is the basis of the further microscopic study. It is worth emphasizing that due to many other factors like stress statuses and boundary conditions, the micro characteristics of TFZ and SFZ are not equal to macroscopic characteristics of tensile cracks and shear cracks, which are presented in our previous studies [39,41].…”

Section: Shear and Tensile Fracturing Zonesmentioning

confidence: 80%

“…Actually, the primary dry cracks in this paper consisted of tensile cracks, shear cracks, and mixed cracks. Based on our previous experimental and numerical study [39,41], the types of dry cracks can be separated by macroscopic observation and analysis on the tensile/shear strain field. Considering this is not the focus of this paper, the mechanical properties and crack nature of dry cracks are directly marked in Table 2 without more analysis ('T' for tensile cracks and 'S' for shear cracks).…”

Section: Trajectories Of Dry Cracksmentioning

confidence: 99%

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Experimental Study on the Fracturing Behaviors and Mechanical Properties of Cracks under Coupled Hydro-Mechanical Effects in Rock-like Specimens

Zhou

Zhao

et al. 2018

Water

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The artificial fracturing technique under coupled hydro-mechanical effects is widely used in many rock engineering. Therefore, the study on the fracturing behaviors and mechanical properties of hydro-mechanical coupled cracks is very crucial. In this study, a series of fracturing tests were conducted on the cylinder gypsum specimens with single pre-existing cracks using triaxial compression loading system. Water pressure was applied inside the pre-existing cracks and led to the specimen failure with external compression loading. A new type of cracks, namely horizontal coupled cracks (HCC), were found in some specimens. Macroscopic observations reveal that HCC, which were mainly caused by the hydraulic pressure, were different from any tensile wing cracks, shear secondary cracks, or shear anti-wing cracks. Subsequently, a microscopic study was performed using scanning electron microscope (SEM), the outcomes suggest that: (1) Shear fracturing zones (SFZ) and tensile fracturing zones (TFZ) under coupled hydro-mechanical effects displayed distinct characteristics on orientations, length, and independence of gypsum grains; and (2) the HCC were tensile cracks when they just initiated from outer tips of pre-existing cracks. While tensile stress made major contribution to the specimen failure during the whole fracturing processes, the HCC became tensile and shear mixed cracks when the specimen was about to fail.

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Section: Trajectories Of Dry Crackssupporting

confidence: 65%

Section: Shear and Tensile Fracturing Zonesmentioning

confidence: 80%

Section: Trajectories Of Dry Cracksmentioning

confidence: 99%

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Experimental Study on the Fracturing Behaviors and Mechanical Properties of Cracks under Coupled Hydro-Mechanical Effects in Rock-like Specimens

Zhou

Zhao

et al. 2018

Water

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“…This criterion is proposed on the basis of the linear elastic fracture mechanics (LEFM) and employs the similar equations to the Griffith criterion, the maximum tangential stress criterion, the stress‐based criterion, and the maximum circumferential strain criterion . Compared with the previous experimental results, our earlier numerical simulations indicate that the strain strength criterion, which consists of the principal strain criterion and the Mohr‐Coulomb criterion, is capable of accurately predicting crack initiation direction, initiation stress, and peak strength. Moreover, the stress‐strain curves and crack propagation paths (wing cracks and secondary cracks) obtained from the strain criterion are highly consistent with the results from laboratory tests.…”

Section: Description Of the Strain Strength Criterionmentioning

confidence: 93%

“…The initiation, propagation, and coalescence of preexisting cracks have been universally regarded as significant issues in rock engineering. Many theoretical, experimental, and numerical studies have been carried out to study the cracking behavior of natural or artificial flaws. Since the stress intensity factor (SIF) K was proposed, the SIFs around a crack tip have been related to the energy release if an infinitely small displacement occurs.…”

Section: Introductionmentioning

confidence: 99%

Influence of inclination angles and confining pressures on mechanical behavior of rock materials containing a preexisting crack

Zhao

Zhou

Zhang

et al. 2019

Num Anal Meth Geomechanics

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To deeply understand the cracking mechanical behavior of brittle rock materials, numerical simulations of a rock specimen containing a single preexisting crack were carried out by the expanded distinct element method (EDEM).Based on the analysis of crack tips and a comparison between stress-and strain-based methods, the strain strength criterion was adopted in the numerical models to simulate the crack initiation and propagation processes under uniaxial and biaxial compression. The simulation results indicated that the crack inclination angle and confining pressure had a great influence on the tensile and shear properties, peak strength, and failure behaviors, which also showed a good agreement with the experimental results. If the specimen was under uniaxial compression, it was found that the initiation stress and peak strength first decreased and then increased with an increasing inclination angle α. Regardless of the size of α, tensile cracks initiated prior to shear cracks. If α was small (such as α ≤ 30 ), the tensile cracks dominated the specimen failure, the wing cracks propagated towards the direction of uniaxial compression, and the propagation of shear cracks was inhibited by the high concentration of tensile stress. In contrast, if α was large (such as α ≥ 45 ), mixed cracks dominated the specimen failure, and the external loading favored the further propagation of shear cracks. Analyzing the numerical results of the specimen with a 45 inclination angle under biaxial compression, it was revealed that lateral confinement had a significant influence on the initiation sequence and the mechanical properties of new cracks. K E Y W O R D Sconfining pressure, crack inclination angle, EDEM, mechanical properties

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Microscopic Experimental Study on Failure Mechanism of Rock-Like Material with Flaw Pairs Under Uniaxial Compression

Zhao

Niu

Zhang

2018

Proceedings of GeoShanghai 2018 International Conference: Rock Mechanics and Rock Engineering

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Crack propagation simulation of rock-like specimen using strain criterion

Cited by 8 publications

References 18 publications

Experimental Study on the Fracturing Behaviors and Mechanical Properties of Cracks under Coupled Hydro-Mechanical Effects in Rock-like Specimens

Experimental Study on the Fracturing Behaviors and Mechanical Properties of Cracks under Coupled Hydro-Mechanical Effects in Rock-like Specimens

Influence of inclination angles and confining pressures on mechanical behavior of rock materials containing a preexisting crack

Microscopic Experimental Study on Failure Mechanism of Rock-Like Material with Flaw Pairs Under Uniaxial Compression

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