Evaluation of the Strength and Deformation Parameters of Olimag Synthetic Olivine
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چکیده
Over the past decade, two buried pipe test cells have been developed by Brachman, Moore and others to evaluate the behaviour of buried pipes under various loading conditions. Health concerns have meant the use of silica-based materials in these cells has been discontinued, being replaced with Olimag synthetic olivine, a uniform angular material used for sand blasting. This paper classifies the strength and deformation parameters of Synthetic Olivine, using results from a series of triaxial tests at varying confining pressures. Response was measured under loose and dense conditions, and Janbu deformation parameters K, and n are determined for both densities. The Synthetic Olivine is found to be a highly stress dependent soil with a low modulus. These strength and deformation parameters are used in pre-test predictions of expected behaviour, and post-testing analysis to interpret the measured response. RÉSUMÉ Pendant la dernière décennie, deux cellules d’essais de tuyaux enterrés ont été développées par Brachman, Moore et autres pour évaluer le comportement des tuyaux enterrés sous des diverses conditions de chargement. Des inquiétudes reliées aux problèmes de santé ont conduit à l’arrêt de l’utilisation des matériaux à base de silice dans ces cellules et à leur remplacement par Olimag Olivine Synthétique, un matériau angulaire uniforme utilisé dans le concassage du sable. Cet article classifie les paramètres de résistance et de déformation de l’Olivine Synthétique, en utilisant les résultats d’une série d’essais triaxiaux à diverses contraintes de confinement. La réponse a été mesurée sous des conditions lâche et dense, et les paramètres de déformation de Janbu K et n sont déterminés pour les deux conditions. Il est trouvé que l’Olivine Synthétique est un sol fortement dépendant du niveau de contrainte avec un module faible. Ces paramètres de résistance et déformation ont été utilisés dans la prédiction avant essai des comportements espérés, et des analyses après essai pour interpréter les réponses obtenues.
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تاریخ انتشار 2002