Response of virtual granular specimens to undrained compression following different preconsolidation histories

Galindo-Torres, S. A., Fortuna, S. and Williams, D. J. (2011). Response of virtual granular specimens to undrained compression following different preconsolidation histories. In: Computational Geomechanics, COMGEO II - Proceedings of the 2nd International Symposium on Computational Geomechanics. 2nd International Symposium on Computational Geomechanics, COMGEO II, Cavtat-Dubrovnik, (281-287). 27 - 29 April 2011.

Author Galindo-Torres, S. A.
Fortuna, S.
Williams, D. J.
Title of paper Response of virtual granular specimens to undrained compression following different preconsolidation histories
Conference name 2nd International Symposium on Computational Geomechanics, COMGEO II
Conference location Cavtat-Dubrovnik
Conference dates 27 - 29 April 2011
Proceedings title Computational Geomechanics, COMGEO II - Proceedings of the 2nd International Symposium on Computational Geomechanics
Publication Year 2011
Sub-type Fully published paper
Open Access Status Not yet assessed
ISBN 9789609875011
Start page 281
End page 287
Total pages 7
Abstract/Summary In this paper, the onset of instability of a soil-like material is investigated through the analysis of parameters derived from 3D DEM simulations of undrained triaxial compression tests, and the associated micro-mechanical behaviour of the material. Eight undrained compression tests were carried out on virtual specimens of a graded assembly of spherical particles, starting from a common isotropic state, at different initial void ratios and having overconsolidation ratios of up to 4.5. In accordance with experimental observations of real soils, the specimens with the lowest overconsolidation ratios show instability. The evolution of the total, and the (normalised) sliding and rolling numbers of contacts, describing the micro-mechanics of the assembly, is analysed as a function of the mean stress, prior to failure and under shearing at peak strength conditions. In particular, the asymptotic value of the number of sliding contacts, after a large shearing stage, appears to be a determining factor for predicting the onset of liquefaction instability under undrained shearing.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collection: School of Civil Engineering Publications
 
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Tue, 16 Aug 2016, 13:29:44 EST by System User on behalf of Learning and Research Services (UQ Library)