Spectral Characteristics of Acoustic Emission in Loaded Coal Specimens for Failure Prediction

Шкуратник, В. Л.; Nikolenko, P. V.; Koshelev, A. E.

doi:10.1134/s1062739117052825

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…For its greater sensitivity when compared to the other two AE output parameters (e.g., Counts and Energy), the Amplitude has been here considered as more useful in order to explore the capability of Acoustic Emission technique in early detecting Mode I and Mixed Mode fractures. Other authors reported the investigation on the Acoustic Emission Amplitude pa-rameter for the same purpose of evaluating pre-failure stages in different materials [41][42][43][44].…”

Section: Data Preprocessing and Analysismentioning

confidence: 99%

Exploring the Capability of Acoustic Emission Technique in Early Detecting Mode I and Mixed Mode Fractures

Boccacci¹,

Frasca²,

Aalto³

et al. 2022

SSRN Journal

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Section: Data Preprocessing and Analysismentioning

confidence: 99%

Exploring the Capability of Acoustic Emission Technique in Early Detecting Mode I and Mixed Mode Fractures

Boccacci¹,

Frasca²,

Aalto³

et al. 2022

SSRN Journal

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“…Moradian et al [12] found that AE events could be used to describe the failure levels of brittle rocks. Shkuratnik et al [13] studied the changes in the AE spectra of coal under uniaxial and triaxial compression tests and found that the AE spectral patterns vary greatly at the coal pre-failure stage under uniaxial compression tests. Abbas et al [14] investigated the impact of high attenuation on rock AE mapping failure and then proposed a new method to monitor the rock failure position based on the AE events.…”

Section: Introductionmentioning

confidence: 99%

Research on Precursor Information of Brittle Rock Failure through Acoustic Emission

Ren,

Wang,

Zhao

et al. 2023

Mathematics

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Dynamic failure of surrounding rock often causes many casualties and financial losses. Predicting the precursory characteristics of rock failure is of great significance in preventing and controlling the dynamic failure of surrounding rock. In this paper, a triaxial test of granite is carried out, and the acoustic emission events are monitored during the test. The fractal characteristics of acoustic emission events’ energy distribution and time sequence are analyzed. The correlation dimension and the b value are used to study the size distribution and sequential characteristics. Furthermore, a rock failure prediction method is proposed. The correlation dimension is chosen as the main index and the b value is chosen as a secondary index for the precursor of granite failure. The study shows that: (1) The failure process can be divided into an initial stage, active stage, quiet stage, and failure stage. (2) The b value and correlation dimension both can describe the process of rock failure. There is a continuous decline before failure. Because of the complexity of the field, it is difficult to accurately estimate the stability of surrounding rock using a single index. (3) The combination of the b value and correlation dimension to establish a new method, which can accurately represent the stability of the surrounding rock. When the correlation dimension is increasing, the surrounding rock is stable with stress adjusting. When the correlation dimension is decreasing and the b value remains unchanged after briefly rising, the surrounding rock is stable, and stress is finished adjusting. When the correlation dimension and b value are both decreasing, the surrounding rock will be destroyed.

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“…Ben Ammar et al [9] studied the efects of periodic stifness, hysteresis loop, energy dissipation, and damping on the damage density of sandwich-rich structures in different cyclic loading and unloading tests. Shkuratnik et al [10] discussed the acoustic-emission characteristics of coal samples under diferent loading paths and analyzed the relationship among acoustic-emission parameters, stress, and strain. He et al [11] and Bagde and Petroš [12] investigated the efects of cyclic loading and unloading frequencies, amplitudes, and loading rates on the fatigue mechanical properties of sandstone.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Xie,

Chen,

Fang

et al. 2023

Advances in Civil Engineering

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Four representative TS-RCR (three-soft rock-coal-rock) structural bodies were selected according to the lithofacies analysis of coal measures in the Xiangshui Coal Mine, Guizhou, China, to analyze the mechanical properties, internal structure damage characteristics, and crack evolution law of the TS-RCR structural body composed of a soft roof, a soft floor, and soft coal seams. The mechanical model of the TS-RCR structural body was proposed. (1) The stress-strain curves of TS-RCR structures with different lithologies under cyclic loading and unloading show a change rule of sparsity, density, and sparsity with the increased cycles. The deformation of TS-RCR structures under cyclic loading and unloading can be divided into four stages. When the height ratio of the TS-RCR structural body was the same, the higher the strength of the upper and lower rocks, the more cycles the TS-RCR structural body had, and the denser the cyclic loading and unloading curve. On the contrary, the fewer cycles the TS-RCR structural body had, the sparser the cyclic loading and unloading curve. (2) The T2 (transverse relaxation time) spectrum curves of the structural bodies were monitored at about 1 and 10 ms, and two obvious peaks were detected, indicating micropores and mesopores with a large volume in the structural body. Signal intensity increased at the relaxation time of 1 ms, decreased at 10–100 ms, and increased slightly at 100–1000 ms. The pore structure of the structural body with different lithologies changed significantly with the increased cycle number. (3) The damage and failure process of the structural body was roughly divided into three periods according to the time-history analysis of acoustic-emission AF (the ratio of acoustic-emission ringing count to duration) of the structural body: the active period with a relatively low AF value (AF < 60 kHz) in the 1st-2nd cycles; the rising period with a relatively stable increase of the AF value in the 3rd-4th cycles; and the explosive period with a relatively high AF value (AF ≥ 60 kHz) in the 5th cycles. According to the relationship between the RA (the ratio of the rise time to the amplitude of the acoustic-emission-detection wave) value and time, the evolution law of the RA value and AF value of structures with different lithologies is similar in different periods under cyclic loading and unloading.

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Spectral Characteristics of Acoustic Emission in Loaded Coal Specimens for Failure Prediction

Cited by 11 publications

References 13 publications

Exploring the Capability of Acoustic Emission Technique in Early Detecting Mode I and Mixed Mode Fractures

Exploring the Capability of Acoustic Emission Technique in Early Detecting Mode I and Mixed Mode Fractures

Research on Precursor Information of Brittle Rock Failure through Acoustic Emission

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

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