Numerical optimisation to obtain elastic viscoplastic model parameters for soft clay

Le, TM; Fatahi, B; Khabbaz, H

Numerical optimisation to obtain elastic viscoplastic model parameters for soft clay

Le, TM Fatahi, B

Khabbaz, H

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Publication Type:: Journal Article
Citation:: International Journal of Plasticity, 2015, 65 pp. 1 - 21
Issue Date:: 2015-01-01

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Field	Value	Language
dc.contributor.author	Le, TM	en_US
dc.contributor.author	Fatahi, B https://orcid.org/0000-0002-7920-6946	en_US
dc.contributor.author	Khabbaz, H https://orcid.org/0000-0001-6637-4601	en_US
dc.date.issued	2015-01-01	en_US
dc.identifier.citation	International Journal of Plasticity, 2015, 65 pp. 1 - 21	en_US
dc.identifier.issn	0749-6419	en_US
dc.identifier.uri	http://hdl.handle.net/10453/30290
dc.description.abstract	© 2014 Published by Elsevier Ltd. All rights reserved. In this paper, a numerical optimisation procedure is presented to obtain non-linear elastic viscoplastic (EVP) model parameters adopting the available consolidation data. The Crank-Nicolson finite difference scheme is applied to solve the combination of coupled partial differential equations of the EVP model and the consolidation theory. Then, the model parameters are determined applying the trust-region reflective optimisation algorithm in conjunction with the finite difference solution. The proposed solution for the model parameter determination can utilise all available consolidation data during the dissipation of the excess pore water pressure to determine the required model parameters. Moreover, in order to include creep in the numerical predictions explicitly from the very first time steps, the reference time in the elastic viscoplastic model can readily be adopted as a unit of time. Results obtained from two sets of laboratory experiments adopting hydraulic consolidation (Rowe cells) on a soft soil are reported and discussed. The proposed numerical optimisation procedure is utilised to obtain the viscoplastic model parameters adopting the experimental results, while the settlement and pore water pressure predictions are compared with experimental results to evaluate the accuracy and reliability of the proposed numerical procedure. The predictions are in good agreement with the measurements, supporting the proposed numerical method as a practical tool to analyse the stress-strain behaviour of soft clay.	en_US
dc.relation.ispartof	International Journal of Plasticity	en_US
dc.relation.isbasedon	10.1016/j.ijplas.2014.08.008	en_US
dc.subject.classification	Mechanical Engineering & Transports	en_US
dc.title	Numerical optimisation to obtain elastic viscoplastic model parameters for soft clay	en_US
dc.type	Journal Article
utslib.citation.volume	65	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0913 Mechanical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	65	en_US

Abstract:

© 2014 Published by Elsevier Ltd. All rights reserved. In this paper, a numerical optimisation procedure is presented to obtain non-linear elastic viscoplastic (EVP) model parameters adopting the available consolidation data. The Crank-Nicolson finite difference scheme is applied to solve the combination of coupled partial differential equations of the EVP model and the consolidation theory. Then, the model parameters are determined applying the trust-region reflective optimisation algorithm in conjunction with the finite difference solution. The proposed solution for the model parameter determination can utilise all available consolidation data during the dissipation of the excess pore water pressure to determine the required model parameters. Moreover, in order to include creep in the numerical predictions explicitly from the very first time steps, the reference time in the elastic viscoplastic model can readily be adopted as a unit of time. Results obtained from two sets of laboratory experiments adopting hydraulic consolidation (Rowe cells) on a soft soil are reported and discussed. The proposed numerical optimisation procedure is utilised to obtain the viscoplastic model parameters adopting the experimental results, while the settlement and pore water pressure predictions are compared with experimental results to evaluate the accuracy and reliability of the proposed numerical procedure. The predictions are in good agreement with the measurements, supporting the proposed numerical method as a practical tool to analyse the stress-strain behaviour of soft clay.

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http://hdl.handle.net/10453/30290