堆石颗粒强度尺寸效应和应变率效应研究

doi:10.3724/1000-6915.jrme.2024.0949

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Abstract To investigate the coupling mechanisms of fracture strength, size effect, and strain rate effect in rockfill particles under seismic loading, single-particle strength crushing tests were conducted on Dalian limestone using a self-developed TPWS–800 medium-strain-rate loading apparatus. The particle sizes ranged from 60 to 300 mm, with displacement loading rates of 0.01, 0.1, 1 and 10 mm/s. The experimental results revealed that the characteristic strength of larger particles increased more significantly than that of smaller particles, indicating enhanced strength rate effects in larger particles. Conversely, higher strain rates resulted in a weakening of the size effect. Based on the generalized weakest-link Weibull model, a power function was employed to characterize the sparsity of spatial microcrack distributions within the particles. The fitting of particle strengths under different loading rates demonstrated significantly better performance compared to models assuming uniform crack distributions. Furthermore, the crack distribution exponent decreased with increasing loading rates, indicating that higher loading rates caused “effective cracks” to become progressively sparser. This phenomenon corresponds to the strain rate dependence of particle strength.

Key words： rock mechanics particle fragmentation loading rate size effect Weibull model weakest chain theory

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	Articles by authors
	DENG Yuanhang1
	2
	3
	CHI Shichun1
	2
	3
	YAN Shihao1
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Cite this article:

DENG Yuanhang1,2,3, et al. Effect of the size and strain rate on the particle strength of rockfill materials#br#[J]. , 2025, 44(7): 1950-1958.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0949 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I7/1950

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