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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.1 P.6-19


CFD-DEM modelling of suffusion in multi-layer soils with differentfines contents and impermeable zones

Author(s):  Pei WANG, Ying GE, Tuo WANG, Qi-wei LIU, Shun-xiang SONG

Affiliation(s):  Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon,, Hong Kong China; more

Corresponding email(s):   tuo-cee.wang@polyu.edu.hk

Key Words:  Suffusion, Layered soils, Flow boundary, Impermeable zones, Computational fluid dynamics-discrete element method (CFD-DEM)

Pei WANG, Ying GE, Tuo WANG, Qi-wei LIU, Shun-xiang SONG. CFD-DEM modelling of suffusion in multi-layer soils with differentfines contents and impermeable zones[J]. Journal of Zhejiang University Science A, 2023, 24(1): 6-19.

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author="Pei WANG, Ying GE, Tuo WANG, Qi-wei LIU, Shun-xiang SONG",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

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%T CFD-DEM modelling of suffusion in multi-layer soils with differentfines contents and impermeable zones
%A Ying GE
%A Qi-wei LIU
%A Shun-xiang SONG
%J Journal of Zhejiang University SCIENCE A
%V 24
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%@ 1673-565X
%D 2023
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200108

T1 - CFD-DEM modelling of suffusion in multi-layer soils with differentfines contents and impermeable zones
A1 - Pei WANG
A1 - Ying GE
A1 - Tuo WANG
A1 - Qi-wei LIU
A1 - Shun-xiang SONG
J0 - Journal of Zhejiang University Science A
VL - 24
IS - 1
SP - 6
EP - 19
%@ 1673-565X
Y1 - 2023
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2200108

suffusion in broadly graded granular soils is caused by fluid flow and is a typical cause of geo-hazards. Previous studies of it have mainly focused on suffusion in homogeneous soil specimens. In this study, the coupled discrete element method (DEM) and computational fluid dynamics (CFD) approach is adopted to model suffusion in multi-layered soils with different fines contents, and soils with one or more impermeable zones. The parameters of the CFD-DEM model are first calibrated with the classic Ergun test and a good match with experiment is obtained. Then suffusion in multi-layered soils with different fines contents and impermeable zones is simulated and discussed. The simulation results show that, for soils with multiple layers, the cumulative eroded mass is mainly determined by the fines content of the bottom layer. In general, the higher the fines content of the bottom soil layer, the higher the cumulative eroded mass. In addition, suffusion is more severe if the fines content of the layer above is decreased. impermeable zones inside soil specimens can increase the flow velocity around those zones, facilitating the migration of fine particles and intensifying suffusion.




Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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