Behavior of sands in constant deviatoric stress loading

A. Azizi, R. Imam, A. Soroush, R. Zandian

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review


Many instances of flow-type slope failures are believed to be caused by changes in soil stresses resulting from rises in pore water pressure; among them are submarine flowslides and mining waste dump failures. In a soil mass, a rise in pore water pressure leads to a decrease in mean effective stresses, while the vertical gravity load remains unchanged. Similar loading may be applied to a soil sample in the triaxial apparatus by keeping the deviatoric stress constant, while the confining pressure is decreased. Previous research has shown that under such loading, loose sands initially dilate slightly, and then start to contract substantially as failure is approached. These contractions can lead to the increase in pore pressure and, consequently, failure of the soil mass. The current study shows that these volume contractions are affected by factors such as void ratio, confining pressure, level of deviatoric stress, and anisotropic consolidation.

Original languageEnglish
Title of host publicationPrediction and Simulation Methods for Geohazard Mitigation
EditorsFusao Oka, Akira Murakami, Sayuri Kimoto
PublisherCRC Press Inc
Number of pages6
ISBN (Electronic)9780203871041
ISBN (Print)9780415804820
Publication statusPublished - 1 Jan 2009


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