The transmission effect refers to the migration of eroded fine particles between the neighboring gap-graded soil matrix, and its influence on suffusion is rarely investigated. A supplemental flow with incremental quantities of transmitted fine particles is implemented into a series of CFD-DEM coupling cases to simulate the different levels of transmission effect during the suffusion process. Macroscopic and microscopic impacts of the transmission effect on suffusion are analyzed in detail, including the percentage of eroded fine mass, the spatial distribution of residual particles, the evolution of velocity field & particle movements, and added fine particle migrations. Additionally, analysis of the force-chain network and anisotropic characteristics of specimens are examined from the micromechanical aspect. The numerical results indicate that the transmission effect has both enhancing and inhibitory impacts on suffusion. This work provides a novel perspective considering the suffusion process as a whole interactive system where the eroded fines of each soil matrix would exert an influence on its downstream matrix along the seepage path and contributes to further development of the phenomenological and micromechanical constitutive models of multifield and multiphase media.
- CFD-DEM approach
- Fabric evolution
- Transmission effect
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Earth and Planetary Sciences (miscellaneous)