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Bulletin of Engineering Geology and the Environment

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01.02.2012 | Original Paper

Undrained shear strength of clays as modified by pH variations

verfasst von: Giovanni Spagnoli, David Rubinos, Helge Stanjek, Tomás Fernández-Steeger, Martin Feinendegen, Rafig Azzam

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 1/2012

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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.

Vorheriger Artikel Combined geophysical and geotechnical approach to ground investigations and hazard zonation of a quick clay area, mid Norway

Nächster Artikel Aerodynamic modeling of the Yigong gigantic rock slide-debris avalanche, Tibet, China

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Titel: Undrained shear strength of clays as modified by pH variations
verfasst von: Giovanni Spagnoli
David Rubinos
Helge Stanjek
Tomás Fernández-Steeger
Martin Feinendegen
Rafig Azzam
Publikationsdatum: 01.02.2012
Verlag: Springer-Verlag
Erschienen in: Bulletin of Engineering Geology and the Environment / Ausgabe 1/2012
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-011-0372-9

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