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ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 13 - 2025 | doi: 10.3389/feart.2025.1594518
This article is part of the Research TopicNatural Hazards Accompanying Underground Exploitation of Mineral Raw MaterialsView all 4 articles
Study on the evolution law of acoustic emission time series characteristics of coal-rock assemblage under true triaxial conditions
Provisionally accepted- 1China Coal Northwest Energy and Chemical Group Co., Ltd., Ordos，China, Ordos, China
- 2China Coal Research Institute (China), Beijing, China
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This study aims to investigate the fractal characteristics of acoustic emission (AE) signals during coal-rock rupture and their predictive significance for impact dynamic hazards. Using the TRW-3000 system, true triaxial loading/unloading tests were conducted on five coal-rock composites with varying coal-thickness ratios. AE signals were analyzed to correlate stress evolution with temporal-spatial fractal features. Key findings reveal that: (1) AE parameters exhibit stress-dependent behavior, growing slowly initially, stabilizing during stress-holding, and surging exponentially before peak stress, with ~90% of cumulative energy released pre-destabilization; (2) Ring counts follow an Λ-type trend against absolute energy, while coal-thickness proportion induces a mirror-image N-type pattern in AE parameters; (3) High-energy/high-ring-count AE events cluster spatiotemporally before failure, with clear time-sequence precursors-short-duration ground sounds and consecutive rises in energy/frequency serve as critical early-warning indicators, whereas isolated signals lack hazard relevance. The results advance risk assessment and real-time monitoring strategies for coal-rock dynamic disasters.
Keywords: True triaxial test, acoustic emission, Coal-rock composite, coal rock rupture, temporal characteristics, Rockburst
Received: 16 Mar 2025; Accepted: 10 Apr 2025.
Copyright: © 2025 Gao, Zhang, Han, Xia, Gao, Zhou and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Chenyang Zhang, China Coal Research Institute (China), Beijing, China
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