Centrifuge modelling of the behaviour of Iron Concentrate ore subjected to rolling movement
ECSMGE-2019, 17th European Conference on Soil Mechanics and Geotechnical Engineering, Reykjavik, ISLANDE, 02-/09/2019 - 06/09/2019 Combination of cyclic loading, fine particles and moisture within a bulk carrier's cargo can result in liquefaction causing the vessel to list or capsize and possib...
Main Authors: | , , |
---|---|
Other Authors: | , , , |
Format: | Conference Object |
Language: | English |
Published: |
HAL CCSD
2019
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02949233 https://hal.archives-ouvertes.fr/hal-02949233v2/document https://hal.archives-ouvertes.fr/hal-02949233v2/file/doc00031668.pdf https://doi.org/10.32075/17ECSMGE-2019-0652 |
Summary: | ECSMGE-2019, 17th European Conference on Soil Mechanics and Geotechnical Engineering, Reykjavik, ISLANDE, 02-/09/2019 - 06/09/2019 Combination of cyclic loading, fine particles and moisture within a bulk carrier's cargo can result in liquefaction causing the vessel to list or capsize and possibly loss of human life. In order to investigate the origin of cargo liquefaction during transportation, a new device has been developed at Ifsttar in the framework of the Franco-German European LiquefAction project. The device is inspired from the Rolling Test suggested by ClassNK (2012), but has been designed to support similar stresses than those observed in a vessel transporting ore cargo, and can be used in a 80×g macrogravity field in the Ifsttar?s 5.5m radius geo-centrifuge. The rolling test device performances are presented, as well as the results of the first test performed on iron concentrate, with a flat geometry and de-aired water as interstitial fluid. High void ratio has been chosen to potentially generate a liquefaction occurrence in some part of the model subjected to rolling movement. The results are analysed in terms of settlement, total stress and pore pressure evolution. La combinaison d'un chargement cyclique, de la présence de particules fines et d'humidité au sein d'une cargaison de minerai peut induire un phénomène de liquéfaction, pouvant engendrer une gite excessive, un déséquilibre du navire, voire sa perte et celle de son équipage. Afin de chercher l'origine de la liquéfaction de minerai au cours du transport maritime, un nouveau dispositif expérimental a été développé à l'Ifsttar dans le cadre d'un projet franco-allemand européen LiquefAction. Le dispositif est inspiré des essais de roulis développés par ClassNK (2012), mais dimensionné pour supporter des contraintes similaires à celles observées dans un vraquier transportant du minerai, et peut être utilisé à 80×g, dans un champ de macrogravité généré par la centrifugeuse géotechnique de l'Ifsttar. Les essais réalisés sur du minerai de fer ... |
---|