Pre-failure behaviour of reconstituted peats in triaxial compression

This paper discusses the results of an experimental programme designed to investigate the deviatoric behaviour of peats. The results are obtained from triaxial experiments carried out on reconstituted peat samples. The interpretation of the experimental results follows a hierarchical approach in an...

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Bibliographic Details
Published in:Acta geotechnica 2021-03, Vol.16 (3), p.789-805
Main Authors: Muraro, S., Jommi, C.
Format: Article
Language:English
Subjects:
Complex Fluids and Microfluidics
Compression
Deformation
Deformation mechanisms
Engineering
Foundations
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Hardening
Hydraulics
Peat
Plastic deformation
Research Paper
Soft and Granular Matter
Soil Science & Conservation
Solid Mechanics
Strain
Stress history
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Summary:This paper discusses the results of an experimental programme designed to investigate the deviatoric behaviour of peats. The results are obtained from triaxial experiments carried out on reconstituted peat samples. The interpretation of the experimental results follows a hierarchical approach in an attempt to derive the ingredients that an elastic–plastic model for peats should contain, including the yield locus, the hardening mechanism and the flow rule. The results obtained from stress tests along different loading directions show that purely volumetric hardening is not adequate to describe the deviatoric response of peat and that a deviatoric strain-dependent component should be included. The plastic deformation mechanism also depends on the previous stress history experienced by the sample. Stress and strain path dependence of the interaction mechanisms between the peat matrix and the fibres is discussed as a possible physical reason for the observed behaviour. This work offers a relevant set of data and information to guide the rational development and the calibration of constitutive laws able to model the deviatoric behaviour of peats.
ISSN:1861-1125
1861-1133
DOI:10.1007/s11440-020-01019-2