SOMMAIREDes essais d'ancrages en vraie grandeur sur chantier ont été effectués dans des massifs de sables graveleux compactés à différentes densités. Des jauges de déformation collées sur des bar reaux d'acier donnent la distribution des contrain tes dans la zone fixe d'ancrage. Ces dernières augmentent progressivement avec la force appli quée en tête d'ancrage jusqu'à la rupture. Afin d'estimer par des essais standards in situ, l'in fluence du type et de la densité du sol sur la capacité portante du tirant d'ancrage, on a pre senté le rapport entre la charge critique et le nombre de corps d'essais de pénétration (marteau de 50 kg).
SUMMARYFull scale field tests on anchors have been performed in one and the same gravelly sand compacted to various densities. During the pull out tests the distribution of skin friction along the fixed anchor length was determined from strain gauge measurements. The results of 5 series of tests comprising 30 anchors complement a pre viously published design chart and give an addi tional correlation between carrying capacity of anchors and number of blows of penetration tests. The variation of skin friction along fixed anchor length with increasing load or with load kept cons tant over a longer period of time, helps to explain the influence of soil density and fixed anchor length on the carrying capacity and longterm beha viour of anchors.
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