Localisation and lode-angle dependence of geomaterial behaviour

L. A. Le, G. D. Nguyen, H. H. Bui, A. H. Sheikh, A. Kotousov

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

True triaxial test results of geomaterials have shown a strong dependence of the material responses on the third invariant of the deviatoric stress (or alternatively Lode angle). In constitutive modelling, this dependence is usually captured by incorporating different forms of the Lode angle (i.e. Lode angle parameter, third invariant of deviatoric stress) into the macroscopic yield function phenomenologically. In this paper, the mechanism of localised failure is analysed and identified as the underlying cause of the Lode angle dependence, from which a constitutive model is developed. The model includes an additional kinematic field with its own set of governing relationships to account for the high deformation gradient across the boundary of the localisation band. Since the mechanism of localised failure and its initiation, governed by true triaxial stress states, are included, the Lode-angle dependent behaviour is naturally captured without requiring any phenomenological relationships. In this short correspondence, key characteristics of the proposed approach are outlined together with its preliminary results validated against experimental data.

Original languageEnglish
Title of host publicationACMSM25
Subtitle of host publicationProceedings of the 25th Australasian Conference on Mechanics of Structures and Materials
EditorsChien Ming Wang, Johnny C. M. Ho, Sritawat Kitipornchai
Place of PublicationSingapore
PublisherSpringer
Pages581-590
Number of pages10
ISBN (Electronic)9789811376030
ISBN (Print)9789811376023
DOIs
Publication statusPublished - 2020
EventAustralasian Conference on the Mechanics of Structures and Materials 2018 - Brisbane, Australia
Duration: 4 Dec 20187 Dec 2018
Conference number: 25th
https://acmsm25.com.au/
https://link.springer.com/book/10.1007%2F978-981-13-7603-0 (Proceedings)

Publication series

NameLecture Notes in Civil Engineering
Volume37
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

ConferenceAustralasian Conference on the Mechanics of Structures and Materials 2018
Abbreviated titleACMSM 2018
CountryAustralia
CityBrisbane
Period4/12/187/12/18
Internet address

Keywords

  • Geomaterial
  • Localised failure
  • Lode-angle dependence

Cite this