PSI - Issue 45

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 45 (2023) 52–59

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Prof. Andrei Kotousov 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. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Prof. Andrei Kotousov Keywords: breakage mechanics; compaction band; dual-scale framework; porous rock; strain localisation 17th Asia-Pacific Conference on Fracture and Strength and the 13th Conference on Structural Integrity and Failure (APCFS 2022 & SIF 2022) Modelling localised failure in porous reservoir rocks using a continuum model with an embedded localisation band Nhan T. Nguyen a , Dat G. Phan a , Terry Bennett a , Ha H. Bui b , Giang D. Nguyen a, *, Murat Karakus a a The University of Adelaide, School of Architecture and Civil Engineering, Adelaide, SA 5005, Australia b Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia

* Corresponding author. Tel.: +618-8313-2259; fax: +618-8313-4359. E-mail address: g.nguyen@adelaide.edu.au

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Prof. Andrei Kotousov

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Prof. Andrei Kotousov 10.1016/j.prostr.2023.05.013