Cut-Off Performance of a Soil-Cement-Bentonite Wall

Jan Cermak, T.C. Michael Law

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Embankments and Dams

ABSTRACT: Results of a comprehensive evaluation of cut-off performance of an in-situ mixed soil-cement-bentonite (SCB) wall constructed at a Florida dike are presented and discussed. Cracks were observed during drilling of verification drill holes. Subsequently, additional transverse cracking within the top portion of the SCB wall away from those drill holes were also observed. The effects of the observed transverse cracks on the overall wall cut-off performance were studied. Permeability of cracked SCB samples and erosion potential of the SCB material within the crack were measured in the laboratory. Based on the laboratory results and seepage analyses using finite element, it was concluded that the cracks do not affect the long term overall cut-off performance of the SCB wall constructed.

RÉSUMÉ: Les résultats d'une évaluation complète de la coupure de performance d'un sol in-situ-mixtes ciment-bentonite (SCB) mur construit une digue à la Floride sont présentés et discutés. Forage de vérification la cause le craquage et supplémentaires fissuration transversale dans la partie supérieure de la paroi SCB loin de ces forages ont été observés. Les effets de la fissures observées sur la paroi réduction globale des performances de décollage ont été analysés. La perméabilité des échantillons SCB craquage et le test de risque d'érosion de la matière au sein de la SCB crack ont été mesurés en laboratoire. Sur la base des résultats de laboratoire et analyses d 'infiltration numérique, il a été conclu que les fissures ne portent pas atteinte à long terme seuil global de performance du mur construit SCB.

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