TERMIUM Plus®

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POSITIVE RETENTION [1 record]

Record 1 1991-03-06

English

Subject field(s)
  • Soil Mechanics (Engineering)
  • Civil Engineering
CONT

The concept of positive retention as expressed in its simplest form and applied to unidirectional flow does ... have a number of limitations; for instance it is assumed that: (i) Positive restraint is only provided to a soil particle if it is larger than the geotextile pore opening; (ii) Positive restraint is independent of the soil's relative density; (iii) Providing positive restraint to the largest soil particles ... is sufficient to form a soil filter even when the soil has a very high U' value.

French

Domaine(s)
  • Mécanique des sols
  • Génie civil
OBS

Pour satisfaire les exigences du bon fonctionnement d'un filtre en génie civil, la filtrabilité du géotextile doit répondre à une double condition: rétention des particules des sols (éviter le lessivage); circulation de l'eau (éviter le colmatage).

OBS

Les critères de rétention d'un sol meuble sont définis dans le tableau 57 où le seul paramètre conduisant au choix du géotextile est le diamètre de filtration, c'est-à-dire la valeur O95, que l'on retrouve dans l'échelle de classification des géotextiles des recommandations du C.F.G. [Comité Français sur les Géotextiles] (...)

Spanish

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