Evaluating the capability of a critical state constitutive model to predict the collapse potential of loose sand

A. Azizi*, G. Bella, I. Farshchi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Many catastrophic flow failures in granular soil slopes are believed to be caused by a rise in pore water pressure associated with substantial loss of soil shear strength. This failure mechanism is known as prefailure instability or static liquefaction. Constant shear (CS) and consolidated undrained (CU) triaxial tests can reproduce stress paths, in which such instability may occur before reaching the failure. In the present study, a previously proposed critical state constitutive model was first used to simulate the behavior of loose saturated sand in CU tests. It was then employed to predict the instability of loose sand subjected to the CS loading. Under such loading, loose dry sand initially experience small volume increase, and then start to contract substantially. In saturated sand, such contractions can lead to the generation of pore water pressure and sudden decrease of shear strength. The capability of the model to predict the onset of the volume contraction and collapse potential of loose dry sand was examined by comparing the model predictions with experimental results of CS tests. The comparison showed that the effect of initial void ratio, consolidation and deviatoric stresses on behavior of loose dry sand can be well predicted by the model.

Original languageEnglish
Title of host publicationProceedings of International Symposium on Geohazards and Geomechanics (ISGG2015) 10–11 September 2015, Warwick, UK
PublisherIOP Publishing
Number of pages13
ISBN (Print)9781510813106
DOIs
Publication statusPublished - 9 Sep 2015
EventInternational Symposium on Geohazards and Geomechanics - Warwick, United Kingdom
Duration: 10 Sep 201511 Sep 2015

Publication series

NameIOP Conference Series: Earth and Environmental Science
PublisherIOP Publishing
Volume26
ISSN (Print)1755-1307

Conference

ConferenceInternational Symposium on Geohazards and Geomechanics
Abbreviated titleISGG 2015
Country/TerritoryUnited Kingdom
CityWarwick
Period10/09/1511/09/15

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