Abstract
The mechanical instability of soil and subsequent destabilization of the ground resulting from internal erosion were numerically investigated. This study used the discrete element method (DEM) and continuum modelling (critical state soil mechanics) to shed light on the processes of seepage failure and ground depression from the particle (micro) level to the soil system (macro) level. The seepage failure was viewed as a boundary value problem. The DEM analyses demonstrated the first-order effect of narrowing grading due to progressive removal of the finer particles on the stress-strain-dilatancy behaviors. The continuum approximation of internal erosion could be approximated by rising of the critical state line in the compression plane. A numerical simulation procedure using smoothed particle hydrodynamics (SPH) was developed using the continuum model concept proposed. The simulations of progressive seepage failure and depression with internal erosion showed the success of this micromechanics approach.
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