Study of Strength and Deformation Evolution in Raw and Briquette Coal Samples under Uniaxial Compression via Monitoring Their Acoustic Emission Characteristics

Meng, Han; Yang, Yuzhong; Wu, Liyun; Wang, Fei; Peng, Lei

doi:10.1155/2020/8868754

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…The amplitude of intact coal varied continuously during the test, while the amplitude of fractured coal and rock mass changed from disperse to continuity, and the amplitude frequency was high when the stress level was 0.6∼1. The results of this study were consistent with those of Meng et al [38,39]. In the compaction and elastic stages, the amplitude of AE energy was relatively low, and new micro-cracks could not be formed under low stress.…”

Section: Temporal and Spatial Distribution Characteristics Of Acoustic Emission Eventssupporting

confidence: 92%

Research on the Failure Evolution Process of Rock Mass Base on the Acoustic Emission Parameters

et al. 2021

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Fracture mechanics behavior and acoustic emission (AE) characteristics of fractured rock mass are related to underground engineering safety construction, disaster prediction, and early warning. In this study, the failure evolution characteristics of intact and fracture (e.g., single fracture, parallel fractures, cross fractures, and mixed fractures) coal were studied and contrasted with each other on the basis of the distribution of max amplitude of AE. The study revealed some meaningful results, where the value of b (i.e., the distribution characteristic of max amplitude of AE) could represent the failure evolution process of intact and fractured coal. The maximum amplitude distribution of AE events was characterized by Gaussian normal distribution, and the probability of the maximum amplitude of AE events corresponding to 35∼50 dB was the largest. In the stress range of 60∼80%, AE events and maximum amplitude increased rapidly, and the corresponding b value decreased. The energy of AE events showed a downward trend after reaching the maximum value at about 80% stress level. Under the same stress level, the more complex the fracture was, the larger the b value of coal–rock mass was, and the stronger the inhibition effect on the fracture expansion caused by the internal fracture distribution was. Due to the anisotropy of coal–rock mass with a single crack, the distribution of the b value was more discrete, while the anisotropy of coal–rock mass with mixed crack decreased, and the dispersion of the b value decreased. The deformation of cracked coal mainly caused by the adjustment of cracks during the initial loading b value experienced a trend of decreasing first, then increasing, and then decreasing in the loading process. When the load reached 0.8 times of the peak strength, the b value had a secondary decreasing trend, indicating the macroscopic failure of the sample, which could be used as a precursor criterion for the complete failure of coal–rock mass.

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Section: Temporal and Spatial Distribution Characteristics Of Acoustic Emission Eventssupporting

confidence: 92%

Research on the Failure Evolution Process of Rock Mass Base on the Acoustic Emission Parameters

et al. 2021

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“…In the uniaxial compression experiment, the coal sample was compressed by controlling the loading displacement and the load and displacement data were obtained. The relationship between the stress and strain of each coal sample is further obtained. , The stress–strain data analysis of the raw coal compression experiment is drawn in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…The relationship between the stress and strain of each coal sample is further obtained. 29,30 The stress−strain data analysis of the raw coal compression experiment is drawn in Figure 5.…”

Section: Analysis Of Mechanical Propertiesmentioning

confidence: 99%

Comparative Study of Organic and Inorganic Acids on the Mechanism of Physical Damage to Coal Mechanics

Sun,

Ni,

et al. 2023

Energy Fuels

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“…Researchers have used different detection methods to compare the parameters of raw coal and briquettes during loading. Meng et al , analyzed the difference in intensity and fracture evolution by monitoring the acoustic emission characteristics of raw coal and briquette specimens under uniaxial and triaxial compression conditions. Lyu et al measured the resistivity of raw coal and briquettes when adsorbing CO 2 under varying temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

Resistivity Response Characteristics of Coal and Coal-like Materials under Uniaxial Compression

Hu,

Liu,

et al. 2024

Energy Fuels

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Resistivity is the core electrical parameter of coalfield electrical prospecting technology to identify geological anomaly areas. Studying the change characteristics of the resistivity of coal under loading is helpful to further improve the accuracy of electric prospecting in delineating the abrupt change area of coal structure and to enhance the ability to reduce and avoid disasters in coal mine production processes. In this study, the resistivity of raw coal and coal-like specimens was monitored under uniaxial compression. The influence mechanism of the coupling structure and moisture on the resistivity of raw coal and coal-like specimens was analyzed. Additionally, the change law of the electrical characteristics during the instability process and the corresponding relationship between the resistivity change and the mechanical behavior of specimens were characterized. The results show that the uniaxial compressive strength and elastic modulus of raw coal specimens are close to the similar-material specimens but much larger than the coal briquette specimens, and the effect of water on similar-material specimens is greater than the coal briquette specimens. The curve of resistivity change over time can be divided into four stages according to the change process of the stress−strain curve. The resistivity of the specimens in stages I and II exhibited a decreasing trend, except for the specimens of similar materials under natural conditions. The trends of the different types of specimens in Stage III were different, and the specimens in Stage IV showed an increasing trend. The order of the resistivity change rate at the stress peak compared to the initial point was as follows: natural similar-material specimen > water-soaked briquette > raw coal > natural briquette > water-soaked similar-material specimen. The experimental results provided theoretical support for further understanding the differences between coal-like materials and raw coal.

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Study of Strength and Deformation Evolution in Raw and Briquette Coal Samples under Uniaxial Compression via Monitoring Their Acoustic Emission Characteristics

Cited by 8 publications

References 19 publications

Research on the Failure Evolution Process of Rock Mass Base on the Acoustic Emission Parameters

Research on the Failure Evolution Process of Rock Mass Base on the Acoustic Emission Parameters

Comparative Study of Organic and Inorganic Acids on the Mechanism of Physical Damage to Coal Mechanics

Resistivity Response Characteristics of Coal and Coal-like Materials under Uniaxial Compression

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