Study on implementation algorithm for simulation the softening with strain localization in plane strain compression behavior of sand

Conference proceedings article

Authors/Editors

WARAT KONGKITKUL

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Publication Details

Author list: Chattonjai P., Peng F.-L., Hua Z., Kongkitkul W.

Publisher: American Society of Civil Engineers (ASCE)

Publication year: 2014

Issue number: 236 GSP

Start page: 766

End page: 775

Number of pages: 10

ISBN: 9780784413388

ISSN: 0895-0563

eISSN: 0895-0563

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903281066&doi=10.1061%2f9780784413388.080&partnerID=40&md5=a3479c50acb4027d6a44ab4d38060817

Languages: English-Great Britain (EN-GB)

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Abstract

In geotechnical engineering practices, most geotechnical structures were constructed as long length structure and constrained the movements in a horizontal direction such as soil retaining wall (RWs), embankments and tunnels. This condition can be significantly expected by plane strain condition. In order to increase the accuracy and efficiency of predicted results of these geotechnical structures by finite-element method (FEM), the strongly numerical approximation for solving the equation of motion, numerical calculation strategy, and appropriate constitutive model were considered. This paper attempts to study the methodology which could be implemented in the elasto-plastic work-hardening-softening model into the modern finite element package like ABAQUS via user-defined material model (UMAT) for simulation of the stress-strain relationship and strain localization as a series of strain contours at pre-peak, post-peak softening and, finally, residual stage of Toyoura sand in plane strain condition. The calculation strategy for updating stress and work-hardening parameter works and the consistent tangent operator with local error control were incorporated to code UMAT. The simulation results were directly compared with the experimental results for verification. The stress-strain relationship and strain localization in the physical tests were successfully simulated by ABAQUS with the present UMAT user-subroutine. ฉ 2014 American Society of Civil Engineers.

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