Linking inherent anisotropy with liquefaction phenomena of granular materials by means of DEM analysis

Otsubo, Masahisa; Chitravel, Sanjei; Kuwano, Reiko; Hanley, Kevin J.; Kyokawa, Hiroyuki; Koseki, Junichi

doi:10.1016/j.sandf.2022.101202

Cited by 14 publications

(2 citation statements)

References 49 publications

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“…Here a higher order microscopic descriptor, i.e., the contact normal-based fabric anisotropy a c0 is introduced and combined with z m0 to be linked with the cyclic liquefaction resistance of granular materials. Recently Otsubo et al (2022) investigated samples with the same z m0 but varying a c0 to isolate the influence of a c0 and found that the cyclic liquefaction resistance under constantvolume cyclic triaxial loading decreases as a c0 increases. This finding, combined with the study by Gu et al (2020) indicating that liquefaction resistance increases with higher z m0 , suggests that for the same material, liquefaction resistance tends to increase with higher coordination number or lower contact normal-based fabric anisotropy.…”

Section: Coordination Number and Fabric Anisotropymentioning

confidence: 99%

“…It was also revealed that the resistance to cyclic liquefaction decreased as fabric anisotropy increased, or coordination number decreased. Otsubo et al (2022) successfully isolated fabric anisotropy from other lowerorder descriptors by constructing DEM samples at the same void ratio, stress conditions, and coordination number but different fabric anisotropies. They observed that samples with a high degree of anisotropy tend to deform more in their weaker direction at an early stage of undrained cyclic loading, leading to lower liquefaction resistance than samples with isotropic fabric.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Anisotropic Consolidation on Cyclic Liquefaction Resistance of Granular Materials via 3D-DEM Modeling

Yang,

Taiebat

2024

J. Geotech. Geoenviron. Eng.

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The influence of anisotropic consolidation on the cyclic liquefaction resistance of granular materials is explored using 3D discrete element method simulations. In this study, the term anisotropic consolidation was defined as the ratio of initial horizontal and vertical normal stresses, and the hypothesis was that the conflicting results from previous laboratory experiments could be attributed to differences in inherent fabric. To test this hypothesis, three unique sample preparation protocols were employed to construct polydisperse spherical particle samples with varying inherent fabrics, as quantified by coordination number and contact-normal fabric anisotropy, under consistent initial mean stress and density conditions. The results were intriguing, as they revealed that anisotropic consolidation had a consistent impact on the cyclic liquefaction resistance of loose and medium-dense samples, regardless of preparation protocol. However, this relationship was not as straightforward in dense samples. In addition, the study assessed the correlations between various parameters, including initial shear wave velocity, state parameters associated with both void ratio and coordination number, fabric anisotropy, and their impact on the cyclic liquefaction resistance of the samples. The findings enhance the understanding of the intricate interplay between anisotropic consolidation and the resistance of granular materials to cyclic liquefaction, providing valuable insights that can inform the development of accurate models for predicting and mitigating cyclic liquefaction in various applications.

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Section: Coordination Number and Fabric Anisotropymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%