间接拉伸作用下煤样声发射多重分形的层理效应研究

doi:10.3724/1000-6915.jrme.2024.0950

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Abstract To investigate the impact of bedding on the multifractal characteristics of acoustic emission (AE) signals during the tensile failure process of coal rock, Brazilian tests were conducted on coal samples with varying bedding angles. AE systems were employed for real-time monitoring, and analyses were performed on the mechanical properties, failure patterns, and ringing counts. The multifractal spectrum of the coal samples was estimated using the MF-DFA method. The time-varying response characteristics of the spectrum width Δα and the frequency spectrum measure subset Δf(?) were examined, which facilitated the identification of precursors to tensile failure in coal rock through multifractal analysis. The research findings indicate that as the bedding angle increases from 0°to 90°and subsequently to C0°, the tensile strength of coal samples initially decreases before increasing again. The failure mode transitions from bedding tensile failure to bedding shear sliding failure, and eventually to matrix tensile failure or a composite failure characterized by bedding shear sliding. Throughout the loading process, the coal samples display a fluctuating decrease followed by an increase in , while Δf(?) exhibits an overall fluctuating decrease. The fractal aggregation activity of cracks is enhanced, and when significant primary fractures develop, both and Δf(?) reach their extreme values, maximizing the non-uniform distribution characteristics of the signals and the proportion of large-scale fractures. The propagation mode of cracks is significantly influenced by bedding, with the bedding dip controlling the direction of crack propagation. This indicates that as the bedding dip increases, cracks transition from bedding-parallel to bedding-perpendicular propagation, resulting in a greater variety of macroscopic cracks. The evolution of crack patterns in coal samples shifts from a “unidirectional gradual” mode to a “multidirectional multifocal” mode. Consequently, the parameter initially decreases and then increases, while the variation of Δf(?) is inconsistent. Overall, the more singular the crack propagation mechanism in coal samples, the smaller the Δf(?). The time-varying response characteristics of the multifractal parameters and Δf(?) in coal samples are closely linked to their crack evolution, with a sudden increase in and a sudden decrease in Δf(?) serving as precursors to tensile failure in coal rock.

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rock mechanics bedding effect Brazilian test acoustic emission MF-DFA crack evolution

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	ZHAO Bingchao1
	2
	WAN Xin1
	WANG Wei1
	2
	GUO Yaxin1
	HE Shenglin1

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ZHAO Bingchao1,2,WAN Xin1, et al. Bedding effect on multifractal characteristics of acoustic emissions in coal specimens under indirect tension[J]. , 2025, 44(9): 2277-2291.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0950 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I9/2277

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