Suffusion, Transport and Filtration of Fine Particles in Granular Soil

The results show that this classical criterion of the filters’ design is not appropriate while maintaining the permeability for the used soils

Didier Marot

2013

Scholarcy highlights

  • Summary and final remarks The initiation of suffusion is governed by: – the geometry of the porous network, which is influenced by the granular distribution, porosity, and the shape of grains; – the hydraulic loading that was mainly modeled by the hydraulic gradient, the hydraulic shear stress, or the pore velocity
  • Suffusion and filtration are two coupled processes that are governed by the geometry of the porous network, the physicochemical interactions between the solid and the fluid phases, as well as by the hydrodynamic conditions
  • The confrontation of the estimations obtained using these grain-size distribution criteria has emphasized the limits of these criteria and the necessity to associate the analysis of the grain size distribution with the evaluation of hydraulic loading
  • Different experimental campaigns have pointed out the presence of a scaling effect that perturbs the hydraulic approach based on the expression of a global hydraulic gradient
  • The comparison of the results with the classical criteria for the design of filters has shown the insufficiency of these criteria and the importance of the hydraulic criterion
  • In the case of a step-input injection of suspended particles in a porous medium, under certain boundary conditions, the convection-dispersion equation with deposition kinetics accepts an analytical solution given by: C(t, x)

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