慢速循环加载作用下堆石颗粒细观破碎机制研究

doi:10.3724/1000-6915.jrme.2026.0081

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Abstract Long-term slow cyclic loading progressively alters the strength and deformation characteristics of rockfill materials. A series of single-particle crushing tests was conducted to investigate the effects of initial particle size, number of loading cycles, and cyclic loading amplitude on the crushing strength and breakage modes of individual particles. In addition, discrete element simulations were performed to reproduce the complete loading history of a single particle, including cyclic loading-unloading and subsequent reloading to failure. Based on the Paris-Erdogan law, a bond-strength degradation factor was developed and incorporated into the particle breakage criterion, providing particle-scale insight into the underlying mechanism of rockfill strength degradation under slow cyclic loading. The results indicate that: (1) Cyclic loading induces cumulative damage, and the crushing strength of individual particles, which follows a Weibull distribution, decreases with increasing cyclic amplitude and number of cycles; (2) Cyclic loading markedly alters the breakage mode, with particles tending to fragment into a greater number of smaller pieces as the cyclic amplitude and number of cycles increase, while the failure pattern gradually shifts from explosive fragmentation to splitting and, ultimately, crushing; (3) Low cyclic stress levels may not produce pronounced macroscopic breakage, but they promote fatigue-crack growth within particles. The proposed bond-strength degradation factor quantitatively captures the coupled effects of stress level and cycle number on fatigue-crack propagation; and (4) the numerical results agree well with the experimental trends, validating the proposed degradation factor and breakage criterion. They further demonstrate that the fundamental mechanism underlying single-particle strength degradation under slow cyclic loading is the fatigue-driven propagation and progressive coalescence of internal cracks.

Key words： soil test rockfill single particle slow cyclic loading crushing strength fatigue crack propagation discrete element method (DEM)

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	Articles by authors
	GAO Yupeng1
	MAO Hangyu1
	2*
	LIU Sihong1
	2
	SHEN Chaomin1
	2
	SUN Yi3

Cite this article:

GAO Yupeng1,MAO Hangyu1,2*, et al. Mesoscopic fracture mechanism of rockfill particles under slow cyclic loading[J]. , 2026, 45(11): 3489-3500.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2026.0081 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I11/3489

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