Study of anisotropic shear strength of granular materials using DEM simulation

Fu, P; Dafalias, YF

dc.contributor.author	Fu, P	en
dc.contributor.author	Dafalias, YF	en
dc.date.accessioned	2014-03-01T01:37:09Z
dc.date.available	2014-03-01T01:37:09Z
dc.date.issued	2011	en
dc.identifier.issn	0363-9061	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21464
dc.subject	Discrete element method	en
dc.subject	Fabric anisotropy	en
dc.subject	Granular material	en
dc.subject	Shear band	en
dc.subject	Shear strength	en
dc.subject	Strain localization	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Mechanics	en
dc.subject.other	Angle-dependent	en
dc.subject.other	Bedding planes	en
dc.subject.other	Biaxial compression	en
dc.subject.other	DEM Simulation	en
dc.subject.other	Descriptors	en
dc.subject.other	Direct shear	en
dc.subject.other	Direct shear test	en
dc.subject.other	Fabric anisotropy	en
dc.subject.other	Historical data	en
dc.subject.other	Inclination angles	en
dc.subject.other	Initial failure	en
dc.subject.other	Loading direction	en
dc.subject.other	Mechanical behavior	en
dc.subject.other	Micro-structural	en
dc.subject.other	Natural sand	en
dc.subject.other	Principal stress	en
dc.subject.other	Principal stress space	en
dc.subject.other	Shear failure	en
dc.subject.other	Shear plane	en
dc.subject.other	Simulation result	en
dc.subject.other	Strain levels	en
dc.subject.other	Strain localization	en
dc.subject.other	Strain localizations	en
dc.subject.other	Anisotropy	en
dc.subject.other	Compression testing	en
dc.subject.other	Computer simulation	en
dc.subject.other	Deformation	en
dc.subject.other	Granular materials	en
dc.subject.other	Shear bands	en
dc.subject.other	Soil structure interactions	en
dc.subject.other	Testing	en
dc.subject.other	Shear strength	en
dc.subject.other	anisotropy	en
dc.subject.other	biaxial test	en
dc.subject.other	compression	en
dc.subject.other	deformation	en
dc.subject.other	discrete element method	en
dc.subject.other	granular medium	en
dc.subject.other	shear strength	en
dc.title	Study of anisotropic shear strength of granular materials using DEM simulation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/nag.945	en
heal.identifier.secondary	http://dx.doi.org/10.1002/nag.945	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	This paper investigates shear strength of granular materials with inherent fabric anisotropy. Most previous studies have described strength of these materials in the principal stress space, and the orientation of the bedding plane with respect to the principal stress directions was used as the reference geometrical descriptor of inherent fabric. The present study has found that it is theoretically more convenient and practically more useful to use instead the inclination angle of the bedding plane with respect to the shear plane for the same purpose. Direct shear tests and biaxial compression tests with different loading directions with respect to the bedding planes were simulated with discrete element method (DEM) models consisting of ellipse-shaped particles. Key mechanical behaviors of natural sands reported in the literature were successfully captured in the numerical simulation. A shear failure criterion was determined as a function of the inclination angle based on the direct shear simulation results, and was used to successfully predict the results of the biaxial compression simulations. Microstructural inspection of deformation and strain localization of the biaxial compression simulations found that the proposed shear failure criterion can reasonably predict the orientations of the initial failure planes. It was also discovered that shear bands in directions conjugate to the initial failure plane orientations can develop and dominate specimen deformation at larger strain levels. Considering the availability of biaxial compression test equipment and historical data, two methods for back-calculating inclination angle-dependent shear strength from biaxial compression results were proposed, and validated using DEM simulation results. Copyright (C) 2010 John Wiley & Sons, Ltd.	en
heal.publisher	WILEY-BLACKWELL	en
heal.journalName	International Journal for Numerical and Analytical Methods in Geomechanics	en
dc.identifier.doi	10.1002/nag.945	en
dc.identifier.isi	ISI:000292502900002	en
dc.identifier.volume	35	en
dc.identifier.issue	10	en
dc.identifier.spage	1098	en
dc.identifier.epage	1126	en