Trust-region reflective optimisation to obtain soil visco-plastic properties

Le, TM; Fatahi, B

Trust-region reflective optimisation to obtain soil visco-plastic properties

Le, TM Fatahi, B

Permalink

Publication Type:: Journal Article
Citation:: Engineering Computations (Swansea, Wales), 2016, 33 (2), pp. 410 - 442
Issue Date:: 2016-04-18

Closed Access

	Filename	Description	Size
	EC-11-2014-0236.pdf	Published Version	1.64 MB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

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.date.available	2016-04-01	en_US
dc.date.issued	2016-04-18	en_US
dc.identifier.citation	Engineering Computations (Swansea, Wales), 2016, 33 (2), pp. 410 - 442	en_US
dc.identifier.issn	0264-4401	en_US
dc.identifier.uri	http://hdl.handle.net/10453/44032
dc.description.abstract	© Emerald Group Publishing Limited 0264-4401. Purpose - A non-linear creep function embedded in an elastic visco-plastic (EVP) model can simulate the decrease of creep compression rate with time. It overcomes the limitation of a linear logarithmic creep function, by which creep continuously increases to infinite value as time approaches infinity. However, the determination of the creep model parameters is a challenging task to apply the EVP model. Therefore, the purpose of this paper is to present a new numerical solution to determine the EVP model parameters applying trust-region reflective least square optimisation algorithm and the finite difference scheme to simulate stress-strain behaviour of soft soil. Design/methodology/approach - In this paper, the developed method is verified against the field case study of Vsby test fill. A set of EVP model parameters is obtained by applying the developed method to the available laboratory consolidation results of Vsby clay. Then, the predictions of settlement and the excess pore water pressure at different depths are compared to the available field measurement. Findings - The analysis results show the developed method is a reliable tool to evaluate the long-term performance of soft soils under embankments. Practical implications - Practicing engineers can use the proposed optimisation algorithm to increase the accuracy of the soil visco-plastic model parameters by utilising all laboratory results of several loading stages during and after the dissipation of the excess pore water pressure. Originality/value - A novel numerical solution to determine the visco-plastic model parameters applying trust-region reflective least square optimisation algorithm has been developed.	en_US
dc.relation.ispartof	Engineering Computations (Swansea, Wales)	en_US
dc.relation.isbasedon	10.1108/EC-11-2014-0236	en_US
dc.subject.classification	Applied Mathematics	en_US
dc.title	Trust-region reflective optimisation to obtain soil visco-plastic properties	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	33	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	0915 Interdisciplinary 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.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	33	en_US

Abstract:

© Emerald Group Publishing Limited 0264-4401. Purpose - A non-linear creep function embedded in an elastic visco-plastic (EVP) model can simulate the decrease of creep compression rate with time. It overcomes the limitation of a linear logarithmic creep function, by which creep continuously increases to infinite value as time approaches infinity. However, the determination of the creep model parameters is a challenging task to apply the EVP model. Therefore, the purpose of this paper is to present a new numerical solution to determine the EVP model parameters applying trust-region reflective least square optimisation algorithm and the finite difference scheme to simulate stress-strain behaviour of soft soil. Design/methodology/approach - In this paper, the developed method is verified against the field case study of Vsby test fill. A set of EVP model parameters is obtained by applying the developed method to the available laboratory consolidation results of Vsby clay. Then, the predictions of settlement and the excess pore water pressure at different depths are compared to the available field measurement. Findings - The analysis results show the developed method is a reliable tool to evaluate the long-term performance of soft soils under embankments. Practical implications - Practicing engineers can use the proposed optimisation algorithm to increase the accuracy of the soil visco-plastic model parameters by utilising all laboratory results of several loading stages during and after the dissipation of the excess pore water pressure. Originality/value - A novel numerical solution to determine the visco-plastic model parameters applying trust-region reflective least square optimisation algorithm has been developed.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/44032