文献类型：期刊文献

英文题名：FRACTALS AND CHAOS CHARACTERISTICS OF ACOUSTIC EMISSION ENERGY ABOUT GAS-BEARING COAL DURING LOADED FAILURE

作者：Kong, Xiangguo Wang, Enyuan Li, Shugang Lin, Haifei Xiao, Peng Zhang, Kaizhi

第一作者：Kong, Xiangguo

通信作者：Kong, XG[1];Kong, XG[2]

机构：[1]Xian Univ Sci & Technol, Coll Safety Sci & Engn, Xian 710054, Shaanxi, Peoples R China;[2]MLR, Key Lab Coal Resources Explorat & Comprehens Uti, Xian 710021, Shaanxi, Peoples R China;[3]China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China;[4]Guizhou Inst Technol, Sch Min Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：Xian Univ Sci & Technol, Coll Safety Sci & Engn, Xian 710054, Shaanxi, Peoples R China

通信机构：corresponding author), Xian Univ Sci & Technol, Coll Safety Sci & Engn, Xian 710054, Shaanxi, Peoples R China;corresponding author), MLR, Key Lab Coal Resources Explorat & Comprehens Uti, Xian 710021, Shaanxi, Peoples R China.

年份：2019

卷号：27

期号：5

外文期刊名：FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY

收录：;EI(收录号：20193107250446);Scopus(收录号：2-s2.0-85069805854);WOS:【SCI-EXPANDED(收录号:WOS:000484177000004)】；

基金：The authors are grateful to National Natural Science Foundation of China (51674254, 51674192, 51774235) and Major innovation group Project of Guizhou Education Department (KY[2016]042).

语种：英文

外文关键词：Coal Damage; Acoustic Emission; Energy Evolution; Multifractal Spectrum; Chaos

摘要：To study the damage evolution mechanism of gas-bearing coal and formation causes of acoustic emission signals during this process, the loaded experiments of gas-bearing coal were performed, and acoustic emission (AE) data radiated in this process were collected. Based on the multifractal theory, the causes of AE were explored in various loaded phases. The results showed that at the low stress stage, the fractures close and the friction/slip could cause low-energy acoustic emission events, and the multifractal spectrum had a smaller width. By contrast, at the high stress stage, the cracks expand, penetrate, and rupture, which would lead to AE events with the release of high energy, reflecting an increase in the width of the multifractal spectrum. At the initial loading stage, the time-varying multifractal spectrum was characterized by a chaotic behavior, but as the loading progressed, it gradually became orderly. In the elastic stage, coal experienced elastic deformation without damage, the ratio of strong and weak AE signals was almost the same, and both Delta f(m) and Delta alpha(m) were close to 0. In the plastic fracture stage, coal body consumed huge amounts of energy and suffered fracture. This also caused the coal body to radiate a large amount of AE signals. An analysis of these signals indicated that strong signals dominated and showed an increasing trend, and Delta f(m) was less than 0 and continued to decrease. The time-varying multifractal characteristics reveal the formation mechanism of AE signals from gas-bearing coal, which contributes to improve our understanding of the mechanism of gas-bearing coal damage.