NDLI: Stick-slip behaviour of model granular materials in drained triaxial compression

Content Provider	Springer Nature Link
Author	Doanh, T. Hoang, M. T. Roux, J. N. Dequeker, C.
Copyright Year	2012
Abstract	Drained triaxial axisymmetric compression tests are performed on water-saturated short cylindrical samples of nearly monodisperse glass beads, initially assembled in a loose state by a moist tamping technique. Both deviator stress $$q$$ and volumetric strain $$\epsilon _v$$ , measured as functions of axial strain $$\epsilon _a$$ , for different strain rates, are affected by stick-slip events of very large amplitude, while the classical behavior of loose, contractant granular assemblies, approaching the critical state for large $$\epsilon _a$$ , corresponds to the upper envelop of the stress-strain behaviour. Those events consist in $$(i)$$ a very fast (slip) part in which a drop of $$q$$ coincides with a jump of $$\epsilon _v$$ (contraction), while loss of control of $$\epsilon _a$$ and generation of pore pressure signal a dynamic collapse of the material structure triggered by an instability; and then $$(ii)$$ a quasi-static (stick) part in which the sample regains its strength and, over a short strain interval, behaves similarly to a denser system that dilates before reaching its critical state. A unique stress-dilatancy relation applies to all stick-slip events. Apparent internal friction angles and effects of strain rate and confining pressure are discussed, and it is argued that stick-slip instabilities originate in physico-chemical aging phenomena coupled to contact mechanics.
Starting Page	1
Ending Page	23
Page Count	23
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	15
Issue Number	1
e-ISSN	14347636
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dilatancy Friction Model granular materials Triaxial compression Stick-slip 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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