Mechanoelectrical transformations in quartz and quartz-bearing rocks under acoustic action

Беспалько, А. А.; Yavorovich, L. V.; Fedotov, P.I.

doi:10.1007/s10913-007-0049-8

Cited by 15 publications

(11 citation statements)

References 2 publications

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“…As mentioned previously, many explanations have been proposed for the generation of electromagnetic waves observed during the fracture of rocks. The theory of a piezoelectric effect of quartz [18][19][20] seems to be one of the most convincing theories, which our results of figures 11 and 12 support. It has also been proposed that the electromagnetic emission is caused by the electrification due to friction between crack surfaces contacting each other [21].…”

Section: (D) Electromagnetic Waves Observedsupporting

confidence: 77%

“…These models include the piezoelectric effect [18], e.g. quartz [19,20], electrification due to the scraping of crack surfaces [21], emission of electrons and charged particles from the fracture surfaces [22], movement of electric charges and so on. However, a complete theoretical explanation has not yet been given for the generation mechanism of electromagnetic phenomena.…”

Section: Introductionmentioning

confidence: 99%

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Impact compressive and bending behaviour of rocks accompanied by electromagnetic phenomena

Kobayashi

Horikawa

Ogawa³

et al. 2014

Phil. Trans. R. Soc. A.

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It is well known that electromagnetic phenomena are often observed preceding earthquakes. However, the mechanism by which these electromagnetic waves are generated during the fracture and deformation of rocks has not been fully identified. Therefore, in order to examine the relationship between the electromagnetic phenomena and the mechanical properties of rocks, uniaxial compression and three-point bending tests for two kinds of rocks with different quartz content, granite and gabbro, have been carried out at quasi-static and dynamic rates. Especially, in the bending tests, pre-cracked specimens of granite were also tested. Using a split Hopkinson pressure bar and a ferrite-core antenna in close proximity to the specimens, both the stress–strain (load–displacement) curve and simultaneous electromagnetic wave magnitude were measured. It was found that the dynamic compressive and bending strengths and the stress increase slope of both rocks were higher than those observed in static tests; therefore, there is a strain-rate dependence in their strength and stress increase rate. It was found from the tests using the pre-cracked bending specimens that the intensity of electromagnetic waves measured during crack extension increased almost proportionally to the increase of the maximum stress intensity factor of specimens. This tendency was observed in both the dynamic and quasi-static three-point bending tests for granite.

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Section: (D) Electromagnetic Waves Observedsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Impact compressive and bending behaviour of rocks accompanied by electromagnetic phenomena

Kobayashi

Horikawa

Ogawa³

et al. 2014

Phil. Trans. R. Soc. A.

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“…It was shown in Tomsk polytechnic university that EMS generation in rocks is caused not only by microcrack creations and also by acoustic wave running through them [8,9,10]. At the same time, as it will be shown below, influence of material properties at EMS generation by applying acoustic waves is similar to influence of material properties on parameters of EMS excited at mechanical action.…”

Section: Introductionmentioning

confidence: 74%

“…It should be noted that the quartz existence [9], having piezoelectric properties, exerts a great influence on EMS amplitude of rock samples. The X-ray-phase analysis has shown an existence in samples of minerals of quartz, pyrites, chalcopyrite and calcite.…”

Section: Resultsmentioning

confidence: 99%

Studying electromagnetic signal of rock effected by acoustic impact under uniaxial compression

Yavorovich¹,

Беспалько²,

Pomishin³

et al. 2016

AIP Conference Proceedings

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Abstract. Physical modeling in vitro is a way to carry out basic laws of mechanoelectric transformations in a rock massive. In this paper we examined how rock mechanical properties influenced on parameters of electromagnetic signals (EMS) excited by the determined acoustic impulse under uniaxial compression. It has been determined that sulphides and quartz in rock samples from the Tashtagolsky iron-ore deposit (Western Siberia, Russia) promote transformation of a mechanical energy to an electromagnetic field energy which is expressed in an augmentation of an EMS voltage. An EMS voltage reduction at the change of the stress-strained state of the sample in the course of an uniaxial compression is observed with quantity augmentation of containing of high-conducting magnetite in rocks. The obtained results are important for a physical substantiation of the method of monitoring of the stress-strained state of rock massive by mechanoelectric transformation characteristics.

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“…This is the transformation of the mechanical field energy in structural inhomogeneities or defects in dielectric structures [9]. This approach employs different techniques to conduct the study: short-pulse broadband excitation with subsequent analysis of the recorded responses [10], which increases the signal to noise ratio due to the probing signal energy; excitation by narrowband signals [11][12][13] and separation of responses from inhomogeneities with filters of high selectivity based on the principles of the test sample linearity.…”

Section: Introductionmentioning

confidence: 99%

Method for Separation of Electromagnetic Responses of Mechanoelectrical Transformations Under the Impact of External Noise

et al. 2016

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Abstract. The paper addresses the diagnosis of the presence of defects in concrete, cement-sand and other building and structure mixes using mechanoelectrical transformations. The problem of high levels of electromagnetic noise and interference affecting the correct interpretation of the data to diagnose presence of defects is considered. A version of the electromagnetic response from the unit heterogeneity is proposed, and the assumption of the total electromagnetic signal is suggested. The experiment on acoustic excitation of the sample was conducted and the electromagnetic responses were recorded and filtered using the correlation analysis. The obtained result was compared to the model one to confirm the single response model.

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Mechanoelectrical transformations in quartz and quartz-bearing rocks under acoustic action

Cited by 15 publications

References 2 publications

Impact compressive and bending behaviour of rocks accompanied by electromagnetic phenomena

Impact compressive and bending behaviour of rocks accompanied by electromagnetic phenomena

Studying electromagnetic signal of rock effected by acoustic impact under uniaxial compression

Method for Separation of Electromagnetic Responses of Mechanoelectrical Transformations Under the Impact of External Noise

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