Experimental investigation on predicting precursory changes in entropy for dominant frequency of rockburst

Wang, Chunlai; Chen, Zeng; Liao, Ze-feng; Hou, Xiaolin; Li, Haitao; Wang, Aiwen; Li, Changfeng; Qian, Pengfei; Li, Guangyong; Lü, Hui

doi:10.1007/s11771-020-4506-8

Cited by 24 publications

(6 citation statements)

References 38 publications

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“…The AE count is the number of waves in which an AE signal exceeds the threshold, and AE energy refers to the area under the detection envelope of the AE signal. These parameters are useful for investigating the failure processes and crack-coalescence mechanisms of flawed specimens with different fissure angles [39][40][41][42]. Figure 6 shows the curves of stress, AE count, and AE energy with respect to time in the uniaxial compression tests.…”

Section: Ae Counts and Energymentioning

confidence: 99%

Mechanical Behaviors and AE Characteristics of Brittle Coal Specimens with Different Fissure Angles

Guo

Zhang

et al. 2022

Geofluids

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Uniaxial compression tests were performed on coal specimens with five fissure angles to study the mechanical behaviors and acoustic emission (AE) characteristics of fractured coals. AE and video monitoring techniques were used to examine crack propagation in the fractured specimens. The stress–strain curves, mechanical properties, and cracking processes at different fissure angles were analysed. The AE counts and dominant frequency characteristics, during the failure processes of the specimens, were investigated. In addition, five types of AE signals were classified according to the AE spectral frequency analysis, and low-frequency–high-energy signals were used to accurately predict the brittle fracture processes of the fractured specimens. Finally, a comparison with sandstone specimens revealed the influence of primary cracks on the strength of brittle coal specimens containing preexisting fissures under uniaxial compression. The test results are helpful to elucidate the mechanical behavior and failure mechanism in underground engineering, such as hydraulic slotting in mines.

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Section: Ae Counts and Energymentioning

confidence: 99%

Mechanical Behaviors and AE Characteristics of Brittle Coal Specimens with Different Fissure Angles

Guo

Zhang

et al. 2022

Geofluids

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“…When the mesoelement under uniaxial tension reaches the maximum tensile strain, brittle damage occurs. e primary failure mode of brittle rocks is tensile-induced failure [19,20]. As soon as the tensile stress approaches f t (tensile strength) of the element, damage takes place as per the main damage criteria.…”

Section: Representation Of Damage On the Mesoscopic Scale Viamentioning

confidence: 99%

Study on Mesoscale Damage Evolution Characteristics of Irregular Sandstone Particles Based on Digital Images and Fractal Theory

Zheng

Zuo

Líu

et al. 2021

Advances in Materials Science and Engineering

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To study the mesoscale damage evolution law of irregular sandstone particles, based on RFPA2D and digital image processing technology, a real mesostructure numerical model of irregular sandstone particles is established to simulate the breakage process of particles, the effects of loading conditions and mesoscale heterogeneity on irregular sandstone particle damage are studied, and the calculation method of fractal dimension of irregular rock particles mesoscale fracture is proposed. The results show that the fracture damage degree (ω) and fractal dimension (D) maximum values of the constrained particles are 0.733 and 1.466, respectively, and the unconstrained particles are 0.577 and 1.153, respectively. The final failure mode of constrained particles is more complicated than unconstrained particles, the damage is more serious, and the fracture is more complete. Thus, the larger values of D yield a more complicated final failure mode of the particles. Consequently, with the larger ω, the final damage is more serious, and the breakage effect is comparatively better. The study is of great significance for exploring the laws of rock particle breakage and energy consumption, rock breakage mechanism, and searching for efficient and energy-saving rock-breaking methods.

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“…During the test, the internal AE signals of the specimens were monitored, and the combined analysis index of thermal-acoustic sensitivity was proposed. Wang et al [ 13 ] Wang analysed the main parameters of AE signals, including frequency, entropy, energy, event rate, and amplitude, throughout the entire process of rock fracture as preliminary information of rock fracture. Song et al [ 14 ] conducted uniaxial AE tests on limestone with different freeze-thaw cycles, obtained corresponding physical and mechanical parameters, and studied the correlation between AE signals and microcrack activity in freeze-thaw limestone.…”

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties and acoustic emission characteristics of deep diorite under uniaxial compression

Liu,

Zhou,

Zhang

et al. 2024

Heliyon

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Experimental investigation on predicting precursory changes in entropy for dominant frequency of rockburst

Cited by 24 publications

References 38 publications

Mechanical Behaviors and AE Characteristics of Brittle Coal Specimens with Different Fissure Angles

Mechanical Behaviors and AE Characteristics of Brittle Coal Specimens with Different Fissure Angles

Study on Mesoscale Damage Evolution Characteristics of Irregular Sandstone Particles Based on Digital Images and Fractal Theory

Study on mechanical properties and acoustic emission characteristics of deep diorite under uniaxial compression

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