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The effective coefficient of consolidation Ch, and hence the effective discharge capacity, of prefabricated vertical drains (PVDs) is a function of the hydraulic conductivity and compressibility of the clay as well as of the field performance of the PVD. The field performance is influenced by the deformation of the core and the filter, clogging of the filter, and kinking of the PVD during the consolidation process. The design of soil improvement projects using PVDs is a function of the effective Ch, the final settlement, the drain spacing, and the lateral pressure on the drain. Prefabricated vertical drains should possess sufficient tensile strength to withstand the installation stresses associated with thick clay deposits, as well as the densification of granular soil layers at the surface by heavy tamping. Fibredrain is a PVD that is biodegradable and ecologically harmonious. Several selected projects in East and South East Asia are discussed to illustrate the field performance of Fibredrain.

Le coefficient de consolidation effective Ch et, de là, la capacité de décharge effective des drains verticaux préfabriqués (PVD) est fonction de la conductivité et compressibilité hydrauliques de l'argile ainsi que de la performance de terrain des PVD. La performance de terrain est influencée par la déformation du cur et du filtre, l'occlusion du filtre et la déformation des PVD pendant le processus de consolidation. La conception des projets de consolidation des sols utilisant les PVD dépend du Ch effectif, du tassement final, de l'espacement des drains et de la pression latérale sur le drain. Les drains verticaux préfabriqués devront posséder une résistance à la traction suffisante pour supporter les contraintes d'installation dans des dépôts d'argile épais ainsi que la densification en surface des couches de sol granulaires, densification causée par un compactage lourd. Le Fibredrain est un PVD biodégradable et sans danger pour l'environnement. Nous avons choisi pour notre étude plusieurs projets en Asie orientale et Asie du sud-est afin d'illustrer la performance sur le terrain du Fibredrain.

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