Authors: Ou, Chang-Yu; Chien, Shao-Chi; Chang, Hsuan-Hsiang

Source: Canadian Geotechnical Journal, Volume 46, Number 6, June 2009 , pp. 727-733(7)

Publisher: NRC Research Press

Abstract:

Previous laboratory studies have shown that the injection of a calcium chloride solution followed by the injection of a sodium silicate solution during electroosmosis is effective in strengthening soft silty clay. Very stiff cemented soil near the anodes is formed after the treatment. This paper presents the effectiveness of the process in the field. Nine electrodes were installed using two grid arrangements with electrode spacings of 2.0m × 2.5m and 2.0m × 5.0m. The test procedure is similar to those employed in the laboratory. Test results show that the soil surrounding the anodes (within a diameter of 50-60 cm) became very stiff and cemented due to the effect of cementation between the two chemical solutions and soil particles under the electric field. Except for the areas of stiff cemented soil, the undrained shear strength of the soil between electrodes was increased substantially. Polarity reversal after normal polarity did not produce favorable improvement effects in terms of undrained shear strength of the soil and treatment time.

Des études en laboratoire dans le passé ont démontré que l'injection d'une solution de chlorure de calcium suivie d'une injection d'une solution de silicate de sodium durant l'électro-osmose est efficace pour augmenter la résistance d'une argile silteuse molle. Après le traitement, un sol cimenté très dur s'est formé près des anodes. Cet article présente l'efficacité de ce processus sur le terrain. Neuf électrodes ont été installées en deux arrangements en forme de grille de 2m × 2,5m et 2m× 5m. La procédure d'essais était semblable à celle utilisée en laboratoire. Les résultats de ces essais ont montré qu'un sol cimenté très dur est formé, avec un diamètre de 50 à 60 cm autour des anodes, suite à un effet de cimentation entre les deux solutions chimiques et les particules de sol soumises à un champ électrique. La résistance au cisaillement en condition non drainée du sol entre les électrodes a augmenté considérablement, à l'exception des zones de sol cimenté très dur. L'inversion de la polarité après l'application de la polarité normale n'a pas produit d'amélioration en termes de résistance au cisaillement non drainé du sol, et de temps de traitement.

Document Type: Research article

Publication date: 2009-06-01

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• Published since 1963, this monthly journal features articles, notes, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers, theoreticians, and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Papers on actual case records from practice are encouraged and frequently featured.
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