Effect of rock mechanical properties on electromagnetic radiation mechanism of rock fracturing

Lin, Peng; Wei, Pengcheng; Wang, Cheng; Kang, S. Z.; Wang, Xin

doi:10.1016/j.jrmge.2021.01.001

Cited by 22 publications

(17 citation statements)

References 30 publications

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“…This leads to asymmetric charge separation. Research is still being conducted on the elementary method of the essence of this phenomenon [44]. However, from observations, it can be concluded that the more cracks formed and the faster the crack propagation, the higher the electromagnetic field strength that can be recorded [33].…”

Section: T-time [S]mentioning

confidence: 99%

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Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

Maniak

Mydlikowski

2022

Sensors

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This paper analyses the function of an innovative integrated receiver for the measurement of electromagnetic field emissions. The autonomous receiver measures and registers the elevated emission levels of both components of the EM field originating from rocks subjected to increased mechanical stress. The receiver’s sensitivity of 60 µV/m, its dynamic range of 98 dB, and its impulse response of 0.23 V/µs were determined in laboratory conditions. Real EM field signals from hard coal samples subjected to crushing force were recorded using an autonomous receiver. The observed and recorded results confirm that the receiver operates in the full range of amplitudes of the EM field signal emitted from the rock. The results determine the band of characteristic signals for EM field emission from hard coal. The system created on the basis of autonomous EM receivers can support the existing seismic safety systems in real mine conditions by predicting the possibility of mine collapse hazards.

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Section: T-time [S]mentioning

confidence: 99%

“…For a given width d of the microcrack, the system can be regarded as an elementary According to the theory of crack propagation in rock material, the crack width d can be determined from the relation [44]:…”

Section: T-time [S]mentioning

confidence: 99%

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

Maniak

Mydlikowski

2022

Sensors

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“…Scholars have carried out a large number of experimental studies on cracked rock mass. (Bulloch, 1992;Eppes et al, 2018;Xu and Li, 2019;Ghasemi et al, 2019;Lin et al, 2021). Liu et al (2020) study of crack evolution characteristics using acoustic emission (AE) and charge-coupled device camera (CCD camera).…”

Section: Introductionmentioning

confidence: 99%

The effect of crack characteristics on the mechanical properties and energy characteristics of coal-rock composite structure

Li¹

2022

Acta Geodynamica Et Geomaterialia

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With the gradual increase of coal mining intensity, many coal pillars need to be left near the stope. The stability of the composite structure of coal pillars and their overlying strata determines the safety of the whole stope and the surface. This paper conducts uniaxial compression tests on coalrock composite structures with the same lithology and the same coal-rock height ratio and finds the coal-rock composite structure's mechanical properties and failure characteristics have greater discreteness. Combining the CT images of rock and coal, it is concluded that the main reason for the discreteness of the composite structure test results is the different crack characteristics in the rock specimen and the coal specimen. Therefore, this paper uses the PFC numerical simulation software to analyzes the influence of the crack characteristics on the mechanical properties, failure characteristics, and impact energy index of the coal-rock composite structure. The sensitivity factors are used to analyze the influence of crack angle, crack length, crack number and crack position on the peak stress, total crack number, and impact energy index of the coal-rock composite structure. The research results can provide a theoretical basis and guidance for preventing the instability and failure of the coal pillar-roof composite structure.

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“…Some researchers studied the failure characteristics of coal and rock materials with different properties under uniaxial compression, analyzed the relationship between EMR and characteristic parameters of coal and rock, and studied the change law of amplitude and main frequency at different loading stages. 15,47,[56][57][58][59] These researches mainly investigated the influences of mechanical properties and electrical properties of materials, loading condition and environmental condition, on the EMR waveform, amplitude, and frequency during rock fracturing. However, the investigation of the effect of composition and structure of coal and rock, especially cracks, pores, defects, and weak structural surfaces, on EMR has received less attention in the literatures.…”

mentioning

confidence: 99%

“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] And through the above researches, numerous health monitoring methods for detecting the deformation and fracture process of rock and rock-like materials have emerged, including acoustic emission techniques, [3][4][5][6] optical fiber sensing, 7 ultrasonic wave, 8,9 nuclear magnetic resonance techniques, 10 infrared thermal imaging techniques, 11 digital imaging and X-ray CT imaging techniques, 3,12,13 and electromagnetic radiation techniques. [14][15][16][17] Among these methods, electromagnetic radiation techniques are now widely used in the field of mining engineering for structural health monitoring due to its advantages of continuous, real time, non-contact, and so forth. The EMR phenomenon produced during material fracture was firstly discovered by Stepanov in 1933, 20 and studies on EMR in the fracture process of coal and rock originated from electromagnetic anomaly before earthquake.…”

mentioning

confidence: 99%

Experimental investigation on time‐frequency evolution characteristics of electromagnetic radiation below ULF reflecting the damage performance of coal or rock materials

Yang

Rui

et al. 2021

Structural Contr & Hlth

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As a form of energy dissipation, electromagnetic radiation (EMR) is gradually becoming a mainstream method prediction method for damage monitoring of coal and rock. To better improve the prediction accuracy of EMR, it is crucial to investigate time-frequency characteristics of EMR and the influence of coal and rock properties on EMR that occurs in the fracture process. In this paper, the deformation and fracture process of raw coal, shaped coal, and cement specimens under compression are observed, and time-frequency evolution characteristics of EMR below ultralow frequency (ULF) under different loading stages are evaluated. Then, the inherent reasons of time-frequency evolution of EMR reflecting the damage performance are analyzed. Meanwhile, the effect of loading condition and composition and structure of materials on EMR is discussed. Results show that there is obvious EMR below ULF in the deformation and fracture process of coal and rock materials, and the combined denoising method of ensemble empirical mode decomposition (EEMD) and wavelet is suitable for extraction of EMR. Besides, the amplitude is approximately inversely proportional to frequency of electromagnetic signals, and the relationship between pulse count of EMR and damage is related to the homogeneity of coal and rock materials. Moreover, the time-frequency characteristic parameter of EMR, such as amplitude, pulse count, and frequency spectrum, can indirectly reflect the damage evolution process of coal and rock. These results can provide a theoretical basis for remote monitoring of coal and rock dynamic disaster using EMR below ULF.coal and rock materials, damage evolution j EEMD, electromagnetic radiation, timefrequency characteristics | INTRODUCTIONThe safe development of the coal industry is crucial to the economic lifeline and energy security of the country, especially in coal-dependent countries such as China, India, and South Africa. With the increasing mining depth, high

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Effect of rock mechanical properties on electromagnetic radiation mechanism of rock fracturing

Cited by 22 publications

References 30 publications

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

Autonomous Instrumentation for Measuring Electromagnetic Radiation from Rocks in Mine Conditions—A Functional Analysis

The effect of crack characteristics on the mechanical properties and energy characteristics of coal-rock composite structure

Experimental investigation on time‐frequency evolution characteristics of electromagnetic radiation below ULF reflecting the damage performance of coal or rock materials

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