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            <title xml:lang="fr">De l'intérêt d'instrumenter en continu les tirants d'ouvrage</title>
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                <term xml:lang="en">Retaining wall</term>
                <term xml:lang="en">frost</term>
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                <term xml:lang="en">numerical modelling</term>
                <term xml:lang="en">failure</term>
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              <p>Following the failure of an anchored retaining wall, the repaired zone as well as other zone segments were instrumented in order to understand the usual behaviour of the structure. The monitoring consisted in installing force sensors at the anchors’ head, inclinometers, piezometers, temperature sensor and to record continuously the data during two years. The results showed that during the 2010 and 2012 winters, the effect of frost led to surcharges at the anchors’heads during short periods of time that could not have been observed with the planned monitoring ; once every six months. The monitoring of the structure has then allowed us to improve our knowledge on the behaviour of the mid/long-term geotechnical structure that could help to understand the 2001 failure.</p>
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              <p>Suite à la rupture d’un rideau de palplanche ancré par des tirants en 2001, la zone réparée ainsi que quelques autres tronçons ont été instrumentés afin de comprendre le comportement de l’ouvrage en service. L’instrumentation a consisté à installer des cales pour mesurer les efforts en tête de tirants, des inclinomètres, des piézomètres, une sonde de température et à enregistrer les données en continu pendant deux ans. Les résultats ont montré que pendant les hivers 2010 et 2012, l’effet du gel a induit des surcharges importantes pendant des périodes de temps très courtes qui n’auraient pas pu être observées avec le suivi semestriel prévu. Le suivi de l’ouvrage a donc permis d’améliorer nos connaissances sur le comportement de l’ouvrage à moyen long-terme et de donner un début d’explication aux désordres observés.</p>
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