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UNSATURATED FLOW IN LAYERED COVER SYSTEMS: A COMPARISON BETWEEN NUMERICAL AND FIELD RESULTS
 

Summary: UNSATURATED FLOW IN LAYERED COVER SYSTEMS: A
COMPARISON BETWEEN NUMERICAL AND FIELD RESULTS
Bruno Bussière, UQAT-URSTM, Rouyn-Noranda, Québec
Michel Aubertin, École Polytechnique, Montréal, Québec
Robert P. Chapuis, École Polytechnique, Montréal, Québec
ABSTRACT
Recently, it has been proposed to use covers with capillary barrier effects (CCBE) to limit gas migration and the
infiltration of water into waste disposal facilities. Laboratory studies performed by the authors have shown that silty
materials, such as clean tailings (tailings without sulfide minerals), can be used as the moisture-retaining layer in a
CCBE. An in situ research program was initiated to further demonstrate the efficiency of CCBE constructed with tailings.
This in situ investigation consisted of three experimental cells covered by a CCBE with a moisture-retaining layer made
of clean tailings. Each CCBE was instrumented to monitor volumetric water content and matric suction. The results
showed that such silty materials are efficient to retain moisture, even after a prolonged drainage period of 40 days. A
comparison between predicted modeling results and measured results shows the validity of the proposed approach to
predict actual conditions.
RÉSUMÉ
Les couvertures avec effets de barrière capillaire (CEBC) ont été proposées récemment afin de limiter l'infiltration de
l'eau et la migration des gaz dans les sites d'entreposage de divers rejets. À cet égard, des études en laboratoire ont
permis aux auteurs de démontrer que des matériaux silteux, tels des rejets de concentrateur inertes (non générateurs
d'acide), peuvent être utilisés comme couche de rétention d'eau dans la CEBC. Afin d'aller plus loin dans cette

  

Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal

 

Collections: Engineering; Environmental Management and Restoration Technologies