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<p>In order to study the precursor characteristics of acoustic emission (AE) signals during coal spontaneous combustion (CSC) process, this paper established an AE testing system for CSC process, studied the variation law and precursor characteristics of AE signals during CSC process, and based on AE parameters such as <i>RA-AF</i> value, b value, and <i>Dm</i> value, studied the mechanism of coal thermal fracture and crack propagation evolution. The results indicate that there is a high positive correlation between the intensity of AE signals and temperature during CSC, and the spatial characteristics are obvious. <i>Δα</i> The value increases as the temperature increases, <i>Δf(α)</i>&gt;0 indicates that the AE signal is mainly weak. According to the variation characteristics of AE <i>RA-AF</i> values, it is found that the main form of coal fracture is tensile failure, accompanied by a small amount of shear failure cracks; The value of AE <i>b</i> gradually decreases with the increase of temperature, indicating that the heating process of coal is a process of gradual propagation from sudden microcracks; The <i>Dm</i> value of coal thermal damage parameter is positively correlated with temperature, and after 105 ℃, the slope of the <i>Dm</i> temperature curve increases sharply, indicating an increased degree of thermal damage to the coal body.</p>

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Research on the precursor signal characteristics of new acoustic emission technology for coal spontaneous combustion warning

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Biao Kong,
  • Yongchao Zheng,
  • Yankun Ma,
  • Wei Wang,
  • Linchao Shi,
  • Lei Jiao,
  • Lu Ma,
  • Guiyu Liu,
  • Jun Chen,
  • Guangxing Bai

摘要

In order to study the precursor characteristics of acoustic emission (AE) signals during coal spontaneous combustion (CSC) process, this paper established an AE testing system for CSC process, studied the variation law and precursor characteristics of AE signals during CSC process, and based on AE parameters such as RA-AF value, b value, and Dm value, studied the mechanism of coal thermal fracture and crack propagation evolution. The results indicate that there is a high positive correlation between the intensity of AE signals and temperature during CSC, and the spatial characteristics are obvious. Δα The value increases as the temperature increases, Δf(α)>0 indicates that the AE signal is mainly weak. According to the variation characteristics of AE RA-AF values, it is found that the main form of coal fracture is tensile failure, accompanied by a small amount of shear failure cracks; The value of AE b gradually decreases with the increase of temperature, indicating that the heating process of coal is a process of gradual propagation from sudden microcracks; The Dm value of coal thermal damage parameter is positively correlated with temperature, and after 105 ℃, the slope of the Dm temperature curve increases sharply, indicating an increased degree of thermal damage to the coal body.