Acoustic Emission and Damage Characteristics of Anthracite Under Different Conditions

Zheng, Jiyu; Jin, Xiaohua; Tian, Kunyun; Zhou, Yinbo

doi:10.17222/mit.2020.082

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The research shows that the deformation characteristics of coal under the two methods are consistent, but there are some differences . The damage and acoustic emission characteristics of anthracite with different loading rates, water volumes, and particle sizes were studied . Considering the particle size effect of coal rocks, the influence of different height diameter ratios on the AE characteristics of damage evolution of coal rocks is studied .…”

Section: Introductionmentioning

confidence: 99%

“…18 The damage and acoustic emission characteristics of anthracite with different loading rates, water volumes, and particle sizes were studied. 19 Considering the particle size effect of coal rocks, the influence of different height diameter ratios on the AE characteristics of damage evolution of coal rocks is studied. 20 A multiparameter regression model is established to study the acoustic emission characteristics of coal and rocks.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study on the Mechanical Properties and Acoustic Emission Characteristics of Different Bedding High-Rank Coals

Liu

Yang

et al. 2023

ACS Omega

View full text Add to dashboard Cite

Bedding has an important influence on the macroscopic and microscopic mechanical properties of coal, and the mechanical properties of coal and rock mass and acoustic emission characteristics are very important for rock burst monitoring and warning. In order to explore the influence of different beddings on the mechanical properties and acoustic emission characteristics of high-rank coal, using the RMT-150B electrohydraulic servo rock mechanics test system and the DS5 acoustic emission analyzer, the uniaxial compression and acoustic emission characteristics of high-rank coals with different beddings (parallel bedding 0°, oblique bedding 30, 45, 60°, and vertical bedding 90°) were investigated. The results show that the uniaxial compressive strength and deformation modulus of vertical stratified coal samples are the largest, which are 28.924 MPa and 2.95 GPa, while the average values of uniaxial compressive strength and deformation modulus of oblique stratified coal samples are the smallest, which are 10.91 MPa and 1.776 GPa, respectively. With the increase of the bedding angle, the uniaxial compressive strength of high-rank coal decreases first and then increases. The stress−strain process of coal varies greatly with different high stratification grades (parallel bedding 0°, oblique bedding 30°, 45°, 60°and vertical bedding 90°). The loading times of parallel, oblique, and vertical beddings are 700, 450, 370, 550, and 600 s, and the acoustic emission mutation point values are 495, 449, 350, 300, and 410 s. The mutation point value can be used as precursor information to judge the failure of high-rank coal in different beddings. Research results to find the high-rank coal destruction instability prediction method and the index provide a basis; further damage to the acoustic emission testing high order coal provides reference significance; and the use of acoustic emission in the monitoring and early warning of percussive ground pressure, the bedding surface of coal, and the actual stress on site should be considered.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties and Acoustic Emission Characteristics of Different Bedding High-Rank Coals

Liu

Yang

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Therefore, methods such as acoustic emission (AE) and electromagnetic radiation (EMR) were widely used in monitoring outburst disasters [24][25][26]. Zheng et al [27] found that the acoustic emission characteristics of coal varied significantly over different periods. Kong et al [28] conducted triaxial compression experiments on methane-bearing coal.…”

Section: Introductionmentioning

confidence: 99%

Acoustic-Gas Coupling Response Law in the Whole Process of Coal and Gas Outburst

Zhang,

Zeng,

et al. 2023

Sustainability

View full text Add to dashboard Cite

The intensification of the global energy crisis has led to an increasing demand for coal. China is a major coal-producing country in the world and also the country with the most severe coal and gas outburst disasters. Thus, the coal and gas outburst experiment was conducted, and the following results were obtained: the whole outburst process was divided into three stages, namely the outburst preparation stage, the outburst gestation stage, and the outburst development stage. The gas pressure and acoustic emission signals show significant changes in all three stages, while the variation patterns are different. The gas pressure changes were strongest and the acoustic emission signals were highest during the development stage. Therefore, the outburst development stage was further subdivided into four phases, and the correlation between acoustic emission and gas pressure in each phase was analyzed in detail. Furthermore, the acoustic emission signals in three stages were compared and analyzed. The peak values of acoustic emission count and energy reached 285 times·s−1 and 245 V in the preparation stage and reached 265 times·s−1 and 231 V in the gestation stage, respectively, only 1.66%~1.78% and 2.19%~2.32% of the development stage, namely 15,980 times·s−1 and 10,566 V. Moreover, it was found that the cumulative count and cumulative energy showed a parabolic relationship with the development time of the outburst. Based on the above experimental results, during the production process in coal mines, the dangerous state of outbursts can be monitored through gas pressure changes in the outburst preparation stage and gestation stage. Once in the development stage, more sensitive signals of acoustic emission and their fitting results are used for outburst hazard monitoring and early warning. Monitoring and warning of outbursts of combined gas pressure and acoustic emission signals can effectively improve the safety level of coal mine production.

show abstract

Acoustic Emission and Damage Characteristics of Anthracite Under Different Conditions

Cited by 2 publications

References 0 publications

Experimental Study on the Mechanical Properties and Acoustic Emission Characteristics of Different Bedding High-Rank Coals

Experimental Study on the Mechanical Properties and Acoustic Emission Characteristics of Different Bedding High-Rank Coals

Acoustic-Gas Coupling Response Law in the Whole Process of Coal and Gas Outburst

Contact Info

Product

Resources

About