MSpace - DSpace at UofM >
Research Publications from University of Manitoba Researchers >
Research Publications (UofM Student, Faculty and Staff only access) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1993/2799

Title: Influence of suction on the strength and stiffness of compacted sand-bentonite
Authors: Blatz, JA
Graham, J
Chandler, NA
Keywords: constitutive relationships
unsaturation
laboratory tests
expansive soils
clays
shear strength
TEMPERATURE
BEHAVIOR
Issue Date: 30-Aug-2002
Citation: 0008-3674; CAN GEOTECH J, AUG 2002, vol. 39, no. 4, p.894 to 907.
Abstract: The paper proposes a new elastic-plastic framework for unsaturated, high-plasticity, clayey soils and sand-clay mixtures. The framework considers possible coupling of stress- and suction-induced hardening, leading to a yield surface that is closed or "capped" as suctions increase. This produces a stress state boundary surface in three-dimensional p-q-s stress space (where p is the net mean stress, q is the deviator stress, and s is the matric suction) which differs from that of other conceptual models of its kind. Yielding, a hardening law, and failure criteria for saturated soils are incorporated into the stress state boundary surface. Two parameters, equivalent pressure p(e) and stress ratio eta(s), are introduced to form the basis of the proposed elastic-plastic framework for highly plastic soils with high suctions. This provides an alternative for the stress variables net mean stress and matric suction that are commonly used in modeling unsaturated soils with lower plasticity and lower suctions. This framework has allowed results of experiments on an unsaturated sand-bentonite mixture to be successfully described using elastoplasticity. Yield and failure envelopes associated with the proposed state boundary surface in p-q-s space can be normalized using p(e) and eta(s) in such a way that they agree with a comparable envelope for saturated specimens.
URI: http://hdl.handle.net/1993/2799
DOI: http://dx.doi.org/10.1139/t02-056
Appears in Collection(s):Research Publications (UofM Student, Faculty and Staff only access)

Files in This Item:

File Description SizeFormat
Blatz_Influence_of_suction.pdf622.5 kBAdobe PDFView/Open
View Statistics

Items in MSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! MSpace Software Copyright © 2002-2010  Duraspace - Feedback