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SUMMARY:Effects of particles migration on the properties of some geomateri
 als (clays and granular materials).
DTSTART:20150929T083000
DTEND:20150929T093000
DTSTAMP:20260916T043427Z
UID:4ec84a49ce8ce67c75850a909c9e085efc1a7975778ff596ce85bf43
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Hanène SOULI\, Associate Professor\, LTDS\, National Engi
 neering School\, St-Etienne (France)\nIn this presentation\, the interest 
 will be focused on the study of the effect of the migration of particles o
 n the properties of two geomaterials via two different mechanisms:\n- in g
 ranular materials\, the transport of fines by a water flow\, a phenomenon 
 called “suffusion”\,\n- in clays\, the transport of water and pollutan
 ts by an electric field.\nIn the first case\, the objective of the study c
 arried out on binary mixtures of sand and gravel was to (i) establish new 
 suffusion criteria\, and (ii) follow the evolution of the mechanical prope
 rties of the materials when suffusion occurred. Suffusion was simulated by
  reducing the amount of fines in the samples. Undrained triaxial tests wer
 e carried out to measure its effect on the strength of the samples and the
  evolution of the amplitude of the contractive and dilative phases. The re
 sults highlighted a clear relation between these parameters and the change
 s in the void ratio of the specimens.\nIn the case of clays polluted by he
 avy metals\, electrokinetic was used to depollute the soils. The applicati
 on of the electrical field causes several phenomena to occur: displacement
  of the heavy metal ions\, electroosmosis\, changes in pH\, precipitation\
 , etc. The electrokinetic study was carried out on mixtures of carbonate a
 nd kaolinite\, artificially polluted by lead at different concentrations. 
 In addition to the electrical parameters\, the evolution of the structure 
 after the eletrokinetic treatment was analyzed.\nEven if\, these two pheno
 mena are completely different\, the migration of particles causes changes 
 in the porosity and fabric of the studied samples. As a consequence\, the 
 mechanical and physicochemical properties of the samples are largely influ
 enced.
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STATUS:CONFIRMED
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