Evaporation, unsaturated flow, and salt accumulation in multilayer deposits of “Paste” gold tailings / B. Fisseha in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 12 (Décembre 2010)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1703-1712 Titre : Evaporation, unsaturated flow, and salt accumulation in multilayer deposits of “Paste” gold tailings Type de document : texte imprimé Auteurs : B. Fisseha, Auteur ; R. Bryan, Auteur ; P. Simms, Auteur Année de publication : 2011 Article en page(s) : pp. 1703-1712 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Thickened tailings Paste Evaporation Unsaturated flow Desiccation Salts Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Both the geotechnical and geoenvironmental performances of surface deposited “paste” mine tailings are strongly influenced by desiccation, rewetting after precipitation, as well as interlayer flow. All these processes strongly depend on unsaturated flow within the tailings. Modeling of small (0.15 m in diameter)- and large (1.7 m×1.7 m in plan)-scale tests on two-layer deposits of paste gold tailings showed that desiccation and interlayer flow can be reasonably modeled using one-dimensional unsaturated flow codes, if volume change and its effect on the water-retention curve are considered. Though significant cracking occurred during drying of the paste tailings, its influence on the rate of evaporation was minimal. In some of the tests, the accumulation of salt at the surface substantially suppressed the rate of evaporation. The transport of ions leading to the accumulation of salt is modeled using a one-dimensional contaminant transport code coupled to the unsaturated flow code. The results provide insight into the coupling between evaporation and the accumulation of salts at the tailings’ surface DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i12/p1703_s1?isAuthorized=no [article] Evaporation, unsaturated flow, and salt accumulation in multilayer deposits of “Paste” gold tailings [texte imprimé] / B. Fisseha, Auteur ; R. Bryan, Auteur ; P. Simms, Auteur . - 2011 . - pp. 1703-1712. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1703-1712 Mots-clés : Thickened tailings Paste Evaporation Unsaturated flow Desiccation Salts Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Both the geotechnical and geoenvironmental performances of surface deposited “paste” mine tailings are strongly influenced by desiccation, rewetting after precipitation, as well as interlayer flow. All these processes strongly depend on unsaturated flow within the tailings. Modeling of small (0.15 m in diameter)- and large (1.7 m×1.7 m in plan)-scale tests on two-layer deposits of paste gold tailings showed that desiccation and interlayer flow can be reasonably modeled using one-dimensional unsaturated flow codes, if volume change and its effect on the water-retention curve are considered. Though significant cracking occurred during drying of the paste tailings, its influence on the rate of evaporation was minimal. In some of the tests, the accumulation of salt at the surface substantially suppressed the rate of evaporation. The transport of ions leading to the accumulation of salt is modeled using a one-dimensional contaminant transport code coupled to the unsaturated flow code. The results provide insight into the coupling between evaporation and the accumulation of salts at the tailings’ surface DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i12/p1703_s1?isAuthorized=no

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