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http://dx.doi.org/10.7843/kgs.2018.34.11.33

Numerical Study on Fine Migration in Geo-materials  

Shin, Hosung (Dept. of Civil & Environmental Engrg., Univ. of Ulsan)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.11, 2018 , pp. 33-41 More about this Journal
Abstract
Soil internal erosion is a phenomenon in which fines attached to the solid skeleton are detached by fluid flow, and this continuous fine migration weakens the hydro-mechanical characteristics of the ground structure. This paper proposed governing equations for fine migration in pore spaces and its related scheme for the numerical analysis. Phase diagram for fine particles includes three different states: detached fines in the liquid phase ($c_e$), attached fines in the solid phase (${\sigma}_a$), and pore-clogged fines in the solid phase (${\sigma}_s$). Numerical formulations for finite element method are developed based on the hydraulic governing equations of pore fluid and fine migration. This study proposed a method of estimating model parameters for fine detachment, attachment, and clogging from 1D erosion experiments. And it proposed an analytical formula for hydraulic permeability function considering fine clogging. Numerical analysis of the previous erosion test developed the numerical scheme and verified the adequacy of fine migration models.
Keywords
Fine migration; FEM; Internal erosion;
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