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Article type: Research Article
Authors: Li, Taoa; b; * | Zhang, Zhongyub; * | Tao, Zhigangc | Jia, Xinyub | Wang, Xiaolongb | Wang, Jianb
Affiliations: [a] Inner Mongolia Research Institute, China University of Mining & Technology (Beijing), Ordos, China | [b] School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing, China | [c] State Key Laboratory for Tunnel Engineering, China University of Mining & Technology (Beijing), Beijing, China
Correspondence: [*] Corresponding authors. Tao Li, Ph.D. School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China. Tel.: +86 13681209442. E-mail: lit@cumtb.edu.cn. Zhongyu Zhang, Ph.D. Tel.: +86 13603881869. E-mail: zhangzyu@163.com.cn.
Abstract: Rock crack is one of the main factors responsible for rock failure. Uniaxial compression creep tests are performed using acoustic emission techniques, a high-sensitivity, non-radiative, non-destructive testing method to understand the influence of crack number on the precursor characteristics of short-term creep damage in the fractured rock mass. Based on the Grassberger-Procaccia (G-P) algorithm, the calculation step size for the correlation dimension value (D 2) of the acoustic emission ringing count rate is consistent with that for the acoustic emission b-value. The influence of the number of pre-cracks on the Acoustic emission precursor characteristics of red sandstone creep is analyzed. The results show that near the destabilization of the specimen, the Acoustic emission accumulative ringing count surges in a stepwise manner, the Acoustic emission b-value decreases, the D 2-value increases, the Acoustic emission amplitude shows high intensity and high frequency, and the ringing count increases sharply, all with the characteristics of failure precursors. During the accelerated creep stage of the specimens, with the increase of pre-cracks number, the precursory time points of acoustic emission b-value and D 2-value advance, and their acoustic emission ringing counts increase sharply.
Keywords: Acoustic emission, b-value, correlation dimension value (D2), precursor information, pre-cracks
DOI: 10.3233/JIFS-238964
Journal: Journal of Intelligent & Fuzzy Systems, vol. Pre-press, no. Pre-press, pp. 1-16, 2024
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