Electro-osmotic consolidation of soft Bangkok clay with prefabricated vertical drains

Author:

Bergado D. T.1,Balasubramaniam A. S.1,Patawaran M. A. B.1,Kwunpreuk W.2

Affiliation:

1. School of Civil Engineering, Asian Institute of Technology Bangkok, Thailand

2. Mahanakorn University of Technology Bangkok, Thailand

Abstract

The response of reconstituted soft Bangkok clay to electroosmotic consolidation was investigated using the small cylinder electro-osmotic cell and the large consolidometer. Test results indicated that employing electro-osmosis to induce consolidation produced a 3 to 4·4 times faster rate of consolidation. An 11·6–58% increase in shear strength with the reduction of water content was achieved for treated samples. In contrast, only 9·8–19·5% increase in shear strength was achieved without treatment. It was found that the 120 V/m voltage gradient and the 24 h duration of polarity reversal interval had maximum effect on the shear strength distributions and settlements between the electrodes. Nous avons étudié la réponse d'une argile tendre reconstituée de Bangkok à la consolidation électro-osmotique en utilisant la petite cellule électro-osmotique cylindrique et le grand consolidomètre. Les résultats des essais montrent que l'emploi de l'électro-osmose comme moyen de consolidation produit une consolidation de 3 à 4,4 fois plus rapide. Pour les échantillons traités, nous avons obtenu une augmentation de 11,6 à 58% de la résistance au cisaillement avec la réduction du contenu en eau. A l'inverse, sans traitement, nous n'avons obtenu que 9,8 à 19,5% d'augmentation de la résistance au cisaillement. Nous avons trouvé que le gradient de tension de 120 V/m et l'intervalle de 24 heures pour l'inversion de polarité avaient un effet maximum sur les distributions de résistance au cisaillement et les tassements entre les électrodes.

Publisher

Thomas Telford Ltd.

Subject

Mechanics of Materials,Soil Science,Geotechnical Engineering and Engineering Geology,Building and Construction

Reference10 articles.

1. Removal of cadmium (II) from saturated kaolinite by the application of electrical current

2. Chaudhary S. K. Electro-osmotic Stabilization of Soft Bangkok Clays, 1998, Asian Institute of Technology, Bangkok, AIT thesis No. GE 97-3.

3. Dinoy A. Electro-osmotic Consolidation of Reconstituted Soft Bangkok Clay with Prefabricated Vertical Drains, 1999, Asian Institute of Technology, Bangkok, AIT thesis No. GE 98-5.

4. Pore Pressures, Consolidation, and Electrokinetics

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