Analytical and experimental studies of the evolution of the excess pore water pressure during the deposition of a slurried material

Jian Zheng, Li Li

In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC

Session: Mining Geotechnics and Hydrogeology I

ABSTRACT: The mining industry is accompanied by the generation of large volume of tailings, which are usually pumped to tailings pond, made of tailings dams. Tailings can also be used as backfill material to return and fill underground mine stopes. Similar practice in civil engineering is the disposal of dredged sludge excavated from river or sea beds in a containment structure. Among these practices, a common point is the disposal of a slurried material in a confining structure. To ensure the stability of this structure, it is important to have a good estimation of the pore water pressure (PWP) during the placement of the slurried material in the confining structure. Recently a truly analytical solution has been developed by the authors based on a model proposed by Gibson. However, the analytical solution has never been validated by experimental results. In this paper, the truly analytical solution is first recalled. A simple laboratory test instrumentation is presented. The measured pressures are compared with the analytical solution. The good agreement between the experimental and analytical results indicates that the analytical solution is validated even though it contains some simplifying assumptions.

RÉSUMÉ: La croissance rapide de l'industrie minière est accompagnée avec la production de grands volumes de rejets de concentrateurs, qui sont normalement pompés dans un parc à résidus miniers ceinturé des digues. Les résidus miniers peuvent également être utilisés comme un matériau de remblai pour remplir les chantiers souterrains. Une pratique similaire en génie civil est l'entreposage des boues de dragage extraites des lits fluviaux ou marins dans une structure de confinement. Parmi ces cas, une pratique courante est l'élimination d'un matériau en suspension dans une structure de confinement. Pour assurer la stabilité de cette structure, il est important de d'avoir une bonne estimation de la pression d'eau interstitielle lors de la mise en place des boues dans la structure de confinement. Récemment, une solution analytique a été proposée par Gibson. Cependant, cette solution analytique résultats expérimentaux. Dans cet article, Une au laboratoire sera présentée. Les pressions mesurées sont comparées avec la solution analytique. La bonne corrélation entre les résultats expérimentaux et analytiques indique que la solution analytique est validée même si elle contient des hypothèses simplificatrices.

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Cite this article:
Jian Zheng; Li Li (2018) Analytical and experimental studies of the evolution of the excess pore water pressure during the deposition of a slurried material in GEO2018. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2018Paper381,author = Jian Zheng; Li Li,title = Analytical and experimental studies of the evolution of the excess pore water pressure during the deposition of a slurried material,year = 2018}