Multi-scale chemo-mechanical analysis of the slip surface of landslides in the Three Gorges, China

TitleMulti-scale chemo-mechanical analysis of the slip surface of landslides in the Three Gorges, China
Publication TypeJournal Article
Year of Publication2011
AuthorsY Zhao, P Cui, L Hu, and T Hueckel
JournalScience China Technological Sciences
Volume54
Issue7
Start Page1757
Pagination1757 - 1765
Date Published07/2011
Abstract

Multi-scale chemo-mechanical effects and microscopic failure modes are explored in the evolution of strength change of slip surface. Direct shear equipments, scanning electro-microscope and X-ray diffraction are used to trace the change in strength of remodeled soils of slip surfaces in the Three Gorges area. Results show that there is a release of alkali metals and concentration of clay minerals on the surface. During the tests, potassium ions were released, the cementation was reduced, and the ratio of interlayer minerals varied associated with strength change. Accordingly, illites or montmorillonite-illite mixtures turned into montmorillonite. So the strength change originates from the release of alkali metal ions on molecular scale that leads to the concentration and transition of clay minerals on meso-scale. The evolution of slip surface and soil strength is a typical process involving multi-scale processes of structure changes and chemo-mechanical coupling. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg.

DOI10.1007/s11431-011-4370-8
Short TitleScience China Technological Sciences