Investigation of Cyclic Liquefaction with Discrete Element Simulations
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 12
Abstract
A discrete-element method (DEM) assembly of virtual particles is calibrated to approximate the behavior of a natural sand in undrained loading. The particles are octahedral, bumpy clusters of spheres that are compacted into assemblies of different densities. The contact model is a Jäger generalization of the Hertz contact, which yields a small-strain shear modulus that is proportional to the square root of confining stress. Simulations made of triaxial extension and compression loading conditions and of simple shear produce behaviors that are similar to sand. Undrained cyclic shearing simulations are performed with nonuniform amplitudes of shearing pulses and with 24 irregular seismic shearing sequences. A methodology is proposed for quantifying the severities of such irregular shearing records, allowing the 24 sequences to be ranked in severity. The relative severities of the 24 seismic sequences show an anomalous dependence on sampling density. Four scalar measures are proposed for predicting the severity of a particular loading sequence. A stress-based scalar measure shows superior efficiency in predicting initial liquefaction and pore pressure rise.
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Acknowledgments
This material is based upon work supported by the National Science Foundation under Grant No. NEESR-936408.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 140 • Issue 12 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 8, 2013
Accepted: Jul 23, 2014
Published online: Sep 8, 2014
Published in print: Dec 1, 2014
Discussion open until: Feb 8, 2015
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