The dynamics of the acoustic emission with water initiation

Соболев, Г. А.; Пономарев, А. В.; Maibuk, Yu. Ya.; Zakrzhevskaya, N. A.; Ponyatovskaya, V. I.; Sobolev, D. G.; Khromov, A. I.; Tsyvinskaya, Yu. V.

doi:10.1134/s1069351310020035

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…The gradual migration of pore water to the microcracks field increased the stress around microdefects leading to an increase in the rate of cracking and their rapid development. The obtained AE behavior is similar to the activity of earthquake swarms recorded in seismically active regions (Sobolev et al 2010). In general, the moisture of crystalline rocks influenced the physical precursors of failure.…”

Section: Influence Of Moisturesupporting

confidence: 74%

“…It should be noted that, as water penetrates into stressed material, the pore pressure increases causing the dilatancy of the rock. It is known that the acoustic emission (AE) due to water infusion into loaded samples is a possible model of swarm seismicity (Smirnov et al 2010, Sobolev et al 2010. The effects of temperature on the physicomechanical properties of rock samples and the thermal cracking effects on physical rock properties have been studied by Baddari et al (2012), David et al (1999), Fortin et al (2011), Vinciguerra et al (2005), and Wan et al (2009).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Stress-Strain Conditions on Physical Precursors and Failure Stages Development in Rock Samples

et al. 2015

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Precursory stages of failure development in large rock samples were studied and simultaneous observations of the space-time variation of several physical fields were carried out under different stress-strain states. The failure process was studied in detail. A hierarchical structure of discreet rock medium was obtained after loading. It was found that the moisture reduced the rock strength, increased the microcrack distribution and influenced the shape of the failure physical precursors. The rise in temperature up to 400 °C affected the physical precursors at the intermediate and final stages of the failure. Significant variations were detected in the acoustic and electromagnetic emissions. The coalescence criterion was slightly depending on the rock moisture and temperature effect. The possibility of identifying the precursory stage of failure at different strain conditions by means of a complex parameter derived from the convolution of physical recorded data is shown. The obtained results point out the efficiency of the laboratory modelling of seismic processes.

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Section: Influence Of Moisturesupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Effect of Stress-Strain Conditions on Physical Precursors and Failure Stages Development in Rock Samples

et al. 2015

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“… 30 , 31 . The AE signals were registered during compaction of coarse-grained sand 21 and water penetration into granular samples 32 , 33 . For example 34 , it was shown that the excitation of AE is detected during the onset of the clastic and stiffness recovery regimes 35 .…”

Section: Acoustic Emissionmentioning

confidence: 99%

Acoustic emission induced by sand liquefaction during vibration loading

Frid

Shulov

2022

Sci Rep

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The article deals with the study of poorly graded sand samples of different grain content subjected to liquefaction. The research results show the V-shaped behavior of the AE parameters that correspond to the three-stage sand behavior: Phase A is associated with microfractures/displacements between sand grains caused by an increase in pore pressure before the liquefaction point. Phase B (the stage of AE silence just before the liquefaction point) reflects the equality between pore pressure and stress in the confining chamber. Phase C (the stage of increase in AE parameters’ values) is explained by intense friction between sand grains during their movement caused by liquefaction. Our results show that the AE behavior before, at, and after the liquefaction point is significantly affected by the sand grain content. The change in the sand composition from the poorly graded dune sand to "extremely poorly graded sand" significantly increases the time for the creation of the liquefaction state while the coarser the sand grains become, the longer duration of vibration loading is required to reach the liquefaction state.

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“…In the last few years, a number of laboratory experiments have been performed to investigate the EMR generated on compression and fracture of rock samples (Lacidogna et al 2011, Koktavy 2009, Sobolev et al 2010, Kobayashi et al 2014. The reverse seismoelectric effect, i.e., generation of elastic vibrations by a rock in an AC electric field, is also essential to the understanding of the EMR physics (Ponomarev et al 2002, Sobotka 2004, 2009a.…”

Section: Introductionmentioning

confidence: 99%

“…The reverse seismoelectric effect, i.e., generation of elastic vibrations by a rock in an AC electric field, is also essential to the understanding of the EMR physics (Ponomarev et al 2002, Sobotka 2004, 2009a. The investigations were aimed both at verifying some EMR generation models (Frid et al 2003, Koktavy et al 2004, Koktavy 2009 and at finding relationships between the rock properties and the associated electromagnetic phenomena (Sobolev et al 2010, Wan et al 2008, Kobayashi et al 2014. Recently, neutron bursts have been detected to occur on fracture of quasi-brittle materials such as rocks.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Radiation Generated by Acoustic Excitation of Rock Samples

et al. 2016

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The paper presents an experiment on acoustic excitation of electromagnetic radiation (EMR) signals in skarn, sandstone, and magnetite ore samples. For the skarn and sandstone samples, the EMR signal amplitude was observed to decrease with increasing ultimate strength. Supposedly, this effect can be explained by assuming that EMR is generated when an acoustic wave propagates through an electrical double layer. The presence of piezoelectric inclusions (e.g., quartz) in the magnetite ore enhances the analog EMR signal and its spectral components.

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The dynamics of the acoustic emission with water initiation

Cited by 12 publications

References 7 publications

Effect of Stress-Strain Conditions on Physical Precursors and Failure Stages Development in Rock Samples

Effect of Stress-Strain Conditions on Physical Precursors and Failure Stages Development in Rock Samples

Acoustic emission induced by sand liquefaction during vibration loading

Electromagnetic Radiation Generated by Acoustic Excitation of Rock Samples

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