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Calibration of a double structure constitutive model for unsaturated compacted soils

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Title: Calibration of a double structure constitutive model for unsaturated compacted soils
Authors: Ghiadistri, G
Zdravković, L
Potts, DM
Tsiampousi, A
Item Type: Conference Paper
Abstract: This paper describes a calibration procedure for the double structure constitutive model ICDSM (Imperial College Double Structure Model), developed for highly expansive clays, when the model is applied to MX-80 bentonite. Firstly, the model calibration process is discussed and organised in a number of hierarchical steps. These steps involve the estimation of the macrostructural parameters that can be derived from oedometer, isotropic and triaxial laboratory data. Estimation of the microstructural parameters is more challenging due to the limited knowledge of an expansive clay’s fabric and of the physico-chemical phenomena that control its evolution upon wetting. Nevertheless, this paper discusses the available sources of data and identifies the appropriate information that is needed to characterise the micro-structural behaviour of the bentonite. Finally, through the simulation of a swelling pressure test on a bentonite plug, the hydration of the material is studied as a hydro-mechanical coupled process. Particular attention is devoted to the evolution of the stress state of the sample, which is compared to the experimental measurements in order to demonstrate that the constitutive model accurately reproduces the expansive behaviour of MX-80 bentonite.
Issue Date: 25-Jun-2019
Date of Acceptance: 15-Mar-2019
URI: http://hdl.handle.net/10044/1/75576
DOI: 10.1051/e3sconf/20199215002
Publisher: EDP Sciences
Start Page: 1
End Page: 6
Journal / Book Title: E3S Web of Conferences
Volume: 92
Copyright Statement: © The Authors, published by EDP Sciences, 2019. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: AMEC Foster Wheeler Nuclear UK Ltd
Geotechnical Consulting Group
Funder's Grant Number: PO0006225
CISM_P60087
Conference Name: 7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019)
Publication Status: Published
Start Date: 2019-06-26
Finish Date: 2019-06-29
Conference Place: Glasgow, UK
Online Publication Date: 2019-06-25
Appears in Collections:Civil and Environmental Engineering
Geotechnics