NDLI: Undrained shear strength of clays as modified by pH variations

Content Provider	Springer Nature Link
Author	Spagli, Giovanni Rubis, David Stanjek, Helge Fernández Steeger, Tomás Feinendegen, Martin Azzam, Rafig
Copyright Year	2011
Abstract	The undrained shear strength of clays is an important geotechnical parameter used during construction processes. Several laboratory tests were performed on kaolinite and smectite mixed with pore fluids with different pH values. Vane shear tests were carried out and it was found that the undrained shear resistance for clays increased considerably if the pore fluid had a high or a low pH. A possible explanation could be the dissolution of Al3+ which acts as a coagulant, increasing the internal shear resistance. Geochemical computations, Al measurements and ζ-potential experiments were performed to confirm this theory. The research suggests varying the pH may make a useful contribution to soil improvement techniques.La résistance au cisaillement non drainé des argiles est un paramètre géotechnique important utilisé en phase de construction d’ouvrages. Plusieurs essais de laboratoire ont été mis en œuvre sur des kaolinites et des smectites préparées avec des fluides de différents pH. Des essais de cisaillement au scissomètre ont été réalisés et l’on a trouvé que la résistance au cisaillement non drainé des argiles augmente considérablement si le fluide interstitiel a un pH faible ou fort. Pour un pH faible, une explication possible pourrait venir de la dissolution des Al3+ qui agissent comme des coagulants, augmentant la résistance au cisaillement. Des calculs géochimiques, des mesures de teneur en Al et de potentiel ζ ont été réalisés pour confirmer cette théorie. Les résultats de cette recherche suggèrent que le fait de faire varier le pH de l’eau interstitielle peut contribuer utilement à l’amélioration de la résistance des sols.
Starting Page	135
Ending Page	148
Page Count	14
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	71
Issue Number	1
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Résistance au cisaillement non drainé Kaolinite Na-smectite pH Amélioration des sols Nature Conservation Geoecology/Natural Processes Geoengineering, Foundations, Hydraulics Geotechnical Engineering & Applied Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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