Long term anchor holding capacity in satured clays

Long term anchor holding capacity in satured clays

¹ Professor, Department of Civil Engineering, California State University, Long Beach, California, USA
² Research Assistant, Department of Civil Engineering, California State University, Long Beach, California, USA

Abstract

The results of a laboratory model study investigating the behavior of deeply embedded anchors are presented. The primary purpose of the tests is to study the behavior of the anchor-soil system under long-term loading in saturated, normally consolidated clay.

The tests were conducted in soil of two different shearing strengths. For each soil strength, three different long-term load tests were performed. Long-term loads applied were at stress levels equivalent to 25%, 50% and 75% of the short-term (undrained) anchor break-out capacity. Pore pressure responses around the anchor, including the negative pore pressure (suction) beneath the anchor, were monitored using miniature piezometric probes. The test results provided functional relationship between anchor displacement, anchor load and pore pressure responses associated with consolidation process.

Résumé

Cette communication présente les résultats d’une étude en laboratoire sur le comportement du système ancrage-sol soumis à un chargement de longue durée dans de l'argile saturée, normalement consolidée.

Des sondes piézométriques miniaturisées enregistrent la pression interstitielle autour de l'ancrage et la dépression interstitielle (aspiration) sous l’ancrage. Les résultats expérimentaux ont mis en évidence des relations fonctionnelles entre le déplacement de l'ancrage, la charge de l'ancrage et la pression interstitielle associée au processus de consolidation.