Modelling localised failure in porous reservoir rocks using a continuum model with an embedded localisation band

Nhan T. Nguyen, Dat G. Phan, Terry Bennett, Ha H. Bui, Giang D. Nguyen, Murat Karakus

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

1 Citation (Scopus)

Abstract

The localised failure of highly porous rocks usually involves the size-dependent responses governed by the presence of planar bands in the form of compaction bands under high confinements. Deformations inside these bands induced by grain crushing are much higher than the surrounding host rock, making the rock structure inhomogeneous. This post-localisation mechanism is not able to be correctly captured by classical constitutive models for rocks due to the assumption of homogeneous deformation. The inhomogeneous behaviour can be addressed by our mechanism-based constitutive model in this paper, accounting for properties of the mesoscale localisation bands. In this model, the inclination and thickness of compaction bands are taken into account in kinematic enrichments to connect elastic responses outside and inelastic responses based on breakage mechanics theory inside them. The potential of the proposed approach is presented through several numerical examples, using triaxial tests on rocks.

Original languageEnglish
Title of host publication17th Asia-Pacific Conference on Fracture and Strength and the 13th Conference on Structural Integrity and Failure (APCFS 2022 & SIF 2022)
PublisherElsevier
Pages52-59
Number of pages8
Volume45
DOIs
Publication statusPublished - 2023
EventAsia-Pacific Conference on Fracture and Strength and the Conference on Structural Integrity and Failure 2022 - Hybrid, Adelaide, Australia
Duration: 6 Dec 20229 Dec 2022
Conference number: 17th & 13th
https://www.sciencedirect.com/journal/procedia-structural-integrity/vol/45/suppl/C (Proceedings)

Publication series

NameProcedia Structural Integrity
PublisherElsevier BV
ISSN (Print)2452-3216

Conference

ConferenceAsia-Pacific Conference on Fracture and Strength and the Conference on Structural Integrity and Failure 2022
Abbreviated titleAPCFS 2022 & SIF 2022
Country/TerritoryAustralia
CityAdelaide
Period6/12/229/12/22
Internet address

Keywords

  • breakage mechanics
  • compaction band
  • dual-scale framework
  • porous rock
  • strain localisation

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