Acoustic emission response characteristics of anthracitic coal under uniaxial compression

Du, Feng; Wang, Kai; Zhang, Guojun; Wang, Gongda; Zhang, Qian

doi:10.21203/rs.3.rs-42019/v1

Cited by 1 publication

(1 citation statement)

References 22 publications

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“…Under high temperatures, AE signals of coal are more active and internal damage of coal samples is more severe. 12 A rock mechanics testing machine and an acoustic emission analyzer were used to study the deformation and acoustic emission characteristics of coal samples under the cyclic action of different stress levels. 13 Taking different types of coal samples as research objects, the AE characteristics of different coal samples under uniaxial compression were obtained.…”

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

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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.

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Section: Introductionmentioning

confidence: 99%