NDLI: DEM analysis of the influence of the intermediate stress ratio on the critical-state behaviour of granular materials

Content Provider	Springer Nature Link
Author	Huang, X. Hanley, K. J. O’Sullivan, C. Kwok, C. Y. Wadee, M. A.
Copyright Year	2014
Abstract	The critical-state response of granular assemblies composed of elastic spheres under generalised three-dimensional loading conditions was investigated using the discrete element method (DEM). Simulations were performed with a simplified Hertz–Mindlin contact model using a modified version of the LAMMPS code. Initially isotropic samples were subjected to three-dimensional stress paths controlled by the intermediate stress ratio, $$b=[(\sigma '_{2}-\sigma '_{3})/$$ $$(\sigma '_{1}-\sigma '_{3})]$$ . Three types of simulation were performed: drained (with $$b$$ -value specified), constant volume and constant mean effective stress. In contrast to previous DEM observations, the position of the critical state line is shown to depend on $$b$$ . The data also show that, upon shearing, the dilatancy post-peak increases with increasing $$b$$ , so that at a given mean effective stress, the void ratio at the critical state increases systematically with $$b$$ . Four commonly-used three-dimensional failure criteria are shown to give a better match to the simulation data at the critical state than at the peak state. While the void ratio at critical state is shown to vary with $$b$$ , the coordination number showed no dependency on $$b$$ . The variation in critical state void ratios at the same $$p'$$ value is apparently related to the directional fabric anisotropy which is clearly sensitive to $$b$$ .
Starting Page	641
Ending Page	655
Page Count	15
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	16
Issue Number	5
e-ISSN	14347636
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discrete element method Critical state Intermediate stress ratio Buckling Failure criteria Soft and Granular Matter, Complex Fluids and Microfluidics Engineering Fluid Dynamics Materials Science Geoengineering, Foundations, Hydraulics Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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