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Modelling the influence of fines content on the instability of silty sands considering grain scale interactions

Le, Linh A. and Nguyen, Giang D. and Bui, Ha H. and Andrade, José E. (2021) Modelling the influence of fines content on the instability of silty sands considering grain scale interactions. International Journal of Plasticity, 143 . Art. No. 103020. ISSN 0749-6419. doi:10.1016/j.ijplas.2021.103020.

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Experimental observations have shown the significant influence of silt grains on the instability and liquefaction characteristics of the host sands, but modelling such sand-silt mixtures remains a challenge, due to the complex interactions between fine silt grains and coarse sand grains. This paper presents a constitutive model based on the mechanism of grain-to-grain contacts to capture the behaviour of silty sands in both drained and undrained conditions. Grain scale contact behaviour is modelled using intrinsic void ratio and phenomenological constitutive relationships, and explicitly connected with the macro behaviour. This paves the way for the inclusion of the influence of silt grains on the stiffness and dilation/compaction tendency of the contacts, which in turn control the evolution of macro stress and strain. As a result, the effects of fines contents, stress states and initial densities on the liquefaction characteristics of silty sands can be captured in the proposed model based on phenomenological grain scale constitutive models. Validation against experimental data demonstrates reasonable predictive capabilities of the model in capturing the responses of silty sands with different fines contents. The proposed model is shown to be effective in predicting the onset and progressive development of liquefaction, as a result of changes caused by the addition of fine grains and its interaction with host sands.

Item Type:Article
Related URLs:
URLURL TypeDescription
Le, Linh A.0000-0002-3560-7481
Nguyen, Giang D.0000-0002-8366-1693
Bui, Ha H.0000-0001-8071-5433
Additional Information:© 2021 Elsevier Ltd. Received 26 September 2020, Revised 12 April 2021, Accepted 28 April 2021, Available online 11 May 2021. The authors gratefully acknowledge support from the Australian Research Council via Discovery Projects FT140100408 (Nguyen), DP170103793 (Nguyen, Bui, Andrade), DP190102779 (Nguyen, Bui) and FT200100884 (Bui). CRediT authorship contribution statement. Linh A. Le: Investigation, Methodology, Software, Validation, Formal analysis, Writing – original draft. Giang D. Nguyen: Funding acquisition, Project administration, Conceptualization, Supervision, Methodology, Software, Formal analysis, Writing – review & editing. Ha H. Bui: Funding acquisition, Conceptualization, Supervision, Software, Formal analysis, Writing – review & editing. José E. Andrade: Funding acquisition, Conceptualization, Writing – review & editing. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funding AgencyGrant Number
Australian Research CouncilFT140100408
Australian Research CouncilDP170103793
Australian Research CouncilDP190102779
Australian Research CouncilFT200100884
Subject Keywords:Constitutive modelling; Plasticity theory; Critical state; Liquefaction; Silty sand; Fines content
Record Number:CaltechAUTHORS:20210715-194108149
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Official Citation:Linh A. Le, Giang D. Nguyen, Ha H. Bui, José E. Andrade, Modelling the influence of fines content on the instability of silty sands considering grain scale interactions, International Journal of Plasticity, Volume 143, 2021, 103020, ISSN 0749-6419,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109851
Deposited By: Tony Diaz
Deposited On:15 Jul 2021 20:42
Last Modified:15 Jul 2021 20:42

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