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Type: Journal article
Title: Constitutive modelling of progressive localised failure in porous sandstones under shearing at high confining pressures
Author: Nguyen, C.
Nguyen, G.
Das, A.
Bui, H.
Citation: International Journal of Rock Mechanics and Mining Sciences, 2017; 93:179-195
Publisher: Elsevier
Issue Date: 2017
ISSN: 1365-1609
Statement of
Chi T. Nguyen, Giang D. Nguyen, Arghya Das, Ha H. Bui
Abstract: Localised failure in porous sandstones under shearing at high confining pressure takes place gradually with a progressive development of discrete compaction bands and corresponding evolutions of degrees of grain crushing in these bands. This complex underlying governing mechanism results in cycles of stress drop and increase corresponding to the activation and deactivation of compaction bands. In this study, we develop a hierarchical constitutive structure that allows the modelling of this progressive localised failure at the material (constitutive) level. This capability is usually missing in classical continuum models, making them unable to track the material behaviour beyond the onset of localisation. The key feature of the development in this study is the enrichment of the constitutive strain fields for post-localisation analysis that distinguishes the responses inside and outside compaction bands. This enrichment creates more rooms for the embedment of localised failure mechanisms, instead of adding more parameters to improve the phenomenological behaviour of a model. As a result, compared to the homogeneous case, the enriched model possesses only an extra length parameter directly related to the width of a compaction band while having predictive capabilities to trace the activation and deactivation of several bands during shearing at high confining pressures.
Keywords: Localisation; constitutive modelling; porous sandstones; compaction bands; episodic behaviour; breakage mechanics
Rights: © 2017 Elsevier Ltd. All rights reserved.
RMID: 0030065236
DOI: 10.1016/j.ijrmms.2017.01.014
Grant ID:
Appears in Collections:Civil and Environmental Engineering publications

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