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In the past decade, using geotextiles has elevated considerably in a variety of civil engineering functions: street development, coastal engineering, stabilization of slopes and conserving buildings, reinforcement of foundations, drainage and so forth. This paintings specializes in the criteria which confirm the extent of long term functionality of those fabrics resembling their mechanical and actual homes and physico-chemical growing older strategies. (It contains contributions to a global seminar held at Saint-Remy-les-Chevreuse, France, in November 1986)

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Sample text

Strain characteristics of reinforcement and permissable loads The design of reinforced soil structures employing high modulus reinforcement, with small strains to rupture, such as steel, is generally based on a permissible load approach which does not consider strain in the reinforcement. For such types of reinforcement this approach is satisfactory as both the immediate and long term strains are very small. Geotextiles, however, are much more susceptible to strain under load and moreover a significant proportion of strain is frequently time dependent so that a different approach to the determination of permissible load is needed for permanent structures.

La représentation graphique dans le plan (ε, q) a mis en évidence un point de convergence des droites isochrones. Ce point représente la frontière entre le fluage stabilise et le fluage non stabilisé qui évolue vers la rupture. Pour des contraintes correspondant au fluage stabilisé, c’est–à–dire qqs, la dé—formation croît avec le temps jusqu’à la rupture. La surperposition Temps-Température permet d’extrapoler par une simple translation une courbe de fluage a partir de la courbe des essais réalisée a une température plus élevée.

Des essais de fluage peuvent être conduits sous différentes temperatures. Il en résulte que les différents paramètres a prendre en compte dans une experience de fluage sont : – – – – la contrainte ou la charge initiale la déformation la vitesse de déformation la témperature. Dans cet exposé sont présentés des essais de fluages sur fil polypropylène et polyester sous différentes charges initiales et à diverses températures. 3— Conditions d’essais et représentations graphiques Deux fils, l’un polyester T 105 280/60 dtex et l’autre fil polypropylène 330/60 dtex, dont les resistances à la rupture sont respectivement 18 et 13, 9 N ont été soumis a des essais de fluage en prenant une longueur entre pinces égale à 5 cm.

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