考虑颗粒不均匀影响的土体迂曲度计算公式及其应用

doi:10.3724/1000-6915.jrme.2024.0937

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Abstract Considering the impact of particle non-uniformity on the tortuosity of soil is one approach to enhance the predictive accuracy of soil hydraulic conductivity. In response, a theoretical equation predicting average tortuosity was initially derived based on boundary layer theory and geometric analysis. This equation incorporates ten typical flow paths under varying conditions of particle overlap, selected from the pores of a representative element volume. Additionally, assemblies of square particles with different lengths were numerically simulated using COMSOL Multiphysics software. Several soil column flow tests were conducted under various rainfall intensities. The calculated curves from the proposed equation were then compared with these data, including both previously published simulation and test results. The results indicate that the proposed equation is well-suited to describe the evolution of hydraulic conductivity concerning porosity, as well as the large particle volume fraction and seepage drop relative to flow velocity. Further analysis of the effect of the particle length ratio reveals that soil tortuosity decreases with increasing ratios until this trend stabilizes. Finally, the proposed equation was used to predict the hydraulic conductivity of dam materials in the earth-rock dam with a straight core wall at Nuozhadu Hydropower Station. It was found that the proposed equation outperforms previously published equations due to its consideration of soil particle non-uniformity.

Key words： soil mechanics tortuosity hydraulic conductivity particle non-uniformity soil column flow test COMSOL numerical simulation

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	Articles by authors
	ZHANG Zhao1
	2
	MA Hao1
	ZHU Liangyu3
	ZHANG Zhao1
	ZHOU Zihao1
	ZHANG Yuan?ao1
	WEN Yilong1

Cite this article:

ZHANG Zhao1,2,MA Hao1, et al. Theoretical equation to predict soil tortuosity considering the effect of particle non-uniformity and its application[J]. , 2025, 44(8): 2178-2190.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0937 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I8/2178

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