Discrete element modeling on fracture coalescence behavior of red sandstone containing two unparallel fissures under uniaxial compression

Yang, Sheng‐Qi; Huang, Yan‐Hua; Jing, Hongwen; Xiang-ru, Liu

doi:10.1016/j.enggeo.2014.06.005

Cited by 287 publications

(93 citation statements)

References 42 publications

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“…The DIC method is used for rock deformation observation and to explain the process of rock failure from the perspective of strain localization [10]. The uniaxial compression test on sandstone with two nonparallel fissures has been carried out, and the relationship between the crack angle and the failure type was discussed [11]. A uniaxial compression test on rock materials was conducted with DIC [12].…”

Section: Introductionmentioning

confidence: 99%

Stress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation

Zhang

et al. 2017

Energies

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Abstract:For studying the law of crack propagation around a gas drilling borehole, an experimental study about coal with a cavity under uniaxial compression was carried out, with the digital speckle correlation method capturing the images of coal failure. A sequence of coal failure images and the full-field strain of failure were obtained. The strain softening characteristic was shown by the curve. A method of curve dividing-named fitting-damaging-was proposed, combining the least square fitting residual norm and damage fraction. By this method, the five stages and four key points of a stress-strain curve were defined. Then, the full-field stress was inverted by means of the theory of elasticity and the adjacent element weight sharing model. The results show that σ ci was 30.28-41.71 percent of σ f and σ cd was 83.08-87.34 percent of σ f , calculated by the fitting-damaging method, agreeing with former research. The results of stress inversion showed that under a low stress level (0.15 σ f < σ < 0.5 σ f ), microdamage evolving into plastic failure later was formed around the cavity. Under a high stress level (0.5 σ f < σ < 0.85 σ f ), the region of stress concentration suddenly crazed and formed a brittle crack. When σ ≥ 0.85 σ f , the crack was developing, crack lines were connecting with each other, and the coal finally failed. The outcome of the stress inversion was completely concomitant with the images of crack propagation. Additionally, the stress around the cavity was able to be calculated accurately.

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Section: Introductionmentioning

confidence: 99%

Stress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation

Zhang

et al. 2017

Energies

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“…Yang et al [15] conducted an experimental study on natural rock containing preexisting fissures using an "artificial customization technique." Yang et al [16,17] and Zhang et al [18] examined the effects of the shape and quantity of damage-induced fissures on the mechanical properties of brittle materials, of which regularly distributed initial fissures had been prefabricated artificially. In general, the damage-induced fissures in brittle materials are distributed in the form of open cracks and apertures, and microcracks are distributed randomly in a natural rock mass.…”

Section: Introductionmentioning

confidence: 99%

Use of Acoustic Emission for the Detection of Brittle Rock Failure under Various Loading Rates

Shuang

Chen

et al. 2018

Advances in Civil Engineering

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Acoustic emission has a direct correspondence to the internal damage of a material. To determine the effects of the loading rate on the mechanical properties of rock, the initial damage was characterized using the acoustic emission technique when a uniaxial preloading was imposed on a cylindrical rock sample. On this basis, the uniaxial compression test was conducted on sandstone that contains initial damage induced under a range of loading rates. e effects of the initial damage and loading rate on the mechanical properties of rock were analyzed. e uniaxial preloading generated randomly distributed microcracks in the natural rock. e results showed that the acoustic emission and positioning technique can characterize accurately the damage and its position due to preloading. e development of microcracks was found to be strongly dependent on the loading rate. Moreover, the loading rate accelerated the degradation of the rock strength. e effects of the loading rate and initial damage on the mechanical properties of rock are a complicated coupled process. From the experimental test result, a constitutive equation was constructed based on the damage mechanics.

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“…Later, Hoek et al found that there exists a critical orientation of the inclined crack under compression, in which the pressure required for crack propagation is at its minimum [7]. Then, scholars developed a number of rock models containing single joints [8,9], two joints [10,11] and three joints [12,13], to study the initiation, the propagation and the coalescence of joints. The mechanical properties of jointed rock masses under different loading conditions were also studied, such as uniaxial compression [8], biaxial compression [14], triaxial compression [15] and direct shear test [16].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

et al. 2018

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Due to the complex formation process of a rock mass, a large number of fissures, joints, faults, other defects exist and the defects commonly contain infilled materials. The jointed rock masses are in a complex geological environment, in which the geometric distribution and the boundary condition can greatly affect the mechanical behavior of the infilled jointed rock mass. In this study, the infilled jointed rock mass specimens with different dip angles are prepared using similar materials, and the uniaxial and biaxial compression tests on the specimens are conducted. The effect of the joint dip angle on the mechanical behavior of the infilled jointed rock mass under uniaxial and biaxial compressions is investigated. The results show that the uniaxial compressive strength shows a W-shaped variation, and the biaxial compressive strength shows a V-shaped variation with an increase in the dip angle. Most of the cracks appear in pairs around the joint and occur symmetrically in a bilateral distribution, and the existence of the infilled joints induces a nonlinear mechanical behavior in the specimen. In addition, the specimens exhibit three failure modes under uniaxial compression: splitting failure, step-path failure and planar failure. The specimens present two failure modes under biaxial compression: splitting failure and planar failure.

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Discrete element modeling on fracture coalescence behavior of red sandstone containing two unparallel fissures under uniaxial compression

Cited by 287 publications

References 42 publications

Stress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation

Stress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation

Use of Acoustic Emission for the Detection of Brittle Rock Failure under Various Loading Rates

The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

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