Damage quantification of intact rocks using acoustic emission energies recorded during uniaxial compression test and discrete element modeling

Khazaei, Cyrus; Hazzard, Jim; Chalaturnyk, Rick

doi:10.1016/j.compgeo.2015.02.012

Cited by 146 publications

(44 citation statements)

References 32 publications

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“…There exists very close relation between the phenomenon of AE and rock fracture, and the AE curve during the whole loading process expresses the growth of cracks in rock samples [4,6]. Through the above analysis, we get some qualitative results on AE characters of heated rock samples at different high temperature under uniaxial compression.…”

Section: Fractals In Ae Behaviormentioning

confidence: 92%

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Effect of Thermal Treatment on Fractals in Acoustic Emission of Rock Material

Zhang

Sun

et al. 2016

Advances in Materials Science and Engineering

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Acoustic emission (AE) series on time and location distributions on space are all fractal during the failure process of rock material. In this paper, AE signals of heated rock samples at different temperature under uniaxial compression were captured, and the correlation fractal dimensions (CFDs) of AE counts series at different stress level were calculated using Grassberger-Procaccia algorithm. The temperature effect on AE fractal behavior was revealed. The results show that as the heat temperature increases, the total AE counts are more, while the peak value is less. With the increase of external loading, the AE CFD increases fast to a peak at first and then decreases to a bottom and, after that, increases again but within a narrow range. 200°C and 800°C are two thresholds. As the heat temperature rises, the maximum CFD value and the corresponding stress level both increase from 25°C to 200°C and decrease from 200°C to 800°C and then increase again from 800°C to 1200°C. The CFD value at the failure point shows polynomial decline with rising heat temperature.

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Section: Fractals In Ae Behaviormentioning

confidence: 92%

“…Additionally, AE waveform parameters like duration and frequency content depend on the motion of the crack tip and, therefore, carry information about the mode of the crack. Study of the AE indices enlightens the fracture process, enabling predictions on the rock deformation and failure [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Treatment on Fractals in Acoustic Emission of Rock Material

Zhang

Sun

et al. 2016

Advances in Materials Science and Engineering

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“…During the uniaxial compression process, the development, expansion, and damage of fractures of coal will release stress-strain energy, which can be captured by AE [32][33][34]. The stress-time, acoustic emission energy-time, and acoustic emission cumulative energy-time curves of five groups of coal specimens with different water-soaking heights are shown in Figure 9:…”

Section: Acoustic Emissions Recordsmentioning

confidence: 99%

Effects of Water-Soaking Height on the Deformation and Failure of Coal in Uniaxial Compression

et al. 2019

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The stability of water-preventing coal pillar plays an important role in preventing gob water inrush. The gob side of the water-preventing coal pillar is soaked in a certain height of mine water. Different soaking heights may affect the stability of coal pillars. Few studies have been conducted on the properties of coals with different water-soaking heights. We carried out uniaxial compressive tests on coal specimens with different water-soaking heights to gain a better understanding of different water-soaking-height-induced weakening characteristics of coal. Results show that: (1) The water content of coal specimens increases with the soaking height. Water significantly weakens the strength of coal specimens. However, the extent of strength weakening of the coal specimen does not increase with the increase of the soaked height. The strength of the fully soaked coal specimen is lowest among all groups of coal specimens. The strength of the three groups of partially soaked coal specimens is between the fully soaked coal specimens and the coal specimens without being soaked in the water. In the three groups of partially soaked coal specimens, the strength of the coal specimens increases with the increase of the soaking height. (2) The acoustic emission activities of complete water soaking and nonsoaking coal specimens are relatively concentrated, occurring mainly in unstable fracture expansion stage and post-peak destruction stage, and acoustic emission exhibits main-shock mode. Partially soaking coal specimens, especially the 25% water-soaking height and 50% water-soaking height coal specimens, produces obvious acoustic emission activities during the fracture expansion stabilization phase, and then generates more acoustic emission activities during the unstable expansion stage and the post-peak stage. The acoustic emission presents foreshock-main shock mode. (3) The softening effect of the water soaking on the coal specimens is obvious. It was further found that the deformation of coal specimens with partial water soaking is not synchronized in different layers, the nonuniform deformations of partially soaked coal specimens aggravate its damage.

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“…Park et al (2014) had analyzed on heat transfer and heat loss characteristic of rock cavern thermal energy storage. Khazaei et al (2015) had studied the energies of acoustic emission of intact rock during uniaxial compression test and discrete element modeling. Arsalan et al (2015) had researched the surface energy and wetting behavior of reservoir rocks.…”

Section: Introductionmentioning

confidence: 99%

Energy Analysis and Experiment of Breaking Cobalt-Rich Crust

Liu

Zhang

et al. 2016

Geotech Geol Eng

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The uniaxial compressive breaking process of energy of deep-sea Cobalt-Rich Crust was selected as researching content, and the calculation of energy conversion of breaking Cobalt-Rich Crust under loading and unloading conditions was described in detail, and also the specimens of Cobalt-Rich Crust were tested in rock mechanical testing system under the specified stressing paths. From experimental data, the elastic energy, the dissipated energy and the total inputting energy of unloading points were analyzed systematically. The conclusions are as follows: (1) the specimens of Cobalt-Rich Crust are anisotropic rock, and different testing specimens need to load different axial forces to break, and the maximum of axial force is 8KN, and the minimum is 5KN; (2) when increasing the axial force, the elastic energy, the dissipated energy and the total inputting energy of the unloading points increased nonlienearly; (3) Cobalt-Rich Crust is not the same with other ordinary elastic rock, the elastic energy is lower than the corresponding dissipated energy, and with the increasing of the axial force, the difference between two values becomes more and more.

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Damage quantification of intact rocks using acoustic emission energies recorded during uniaxial compression test and discrete element modeling

Cited by 146 publications

References 32 publications

Effect of Thermal Treatment on Fractals in Acoustic Emission of Rock Material

Effect of Thermal Treatment on Fractals in Acoustic Emission of Rock Material

Effects of Water-Soaking Height on the Deformation and Failure of Coal in Uniaxial Compression

Energy Analysis and Experiment of Breaking Cobalt-Rich Crust

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