Li, H, Eshiet, KI-I, Sheng, Y et al. (3 more authors) (2018) A parallel-bonded chemical corrosion model for discrete element modelling of chemically corroded limestone. Engineering Fracture Mechanics, 202. pp. 297-310. ISSN 0013-7944
Abstract
The mechanical behaviours of rock mass are influenced by the presence of cracks at the microscopic and macroscopic levels. When coupled with corrosion by chemical ions in ground water, these cracks can cause instabilities and fragmentation near the excavated surface of underground structures, such as shield tunnels, etc. This paper presents the development of a parallel-bonded chemical corrosion (PCC) model for modelling corroded rocks (limestone). The model extends the bonded-particle model (BPM) by adding a chemically induced damage law to the particle bond. The damage law of the PCC model is derived from Nuclear Magnetic Resonance (NMR) and triaxial compression tests. The PCC model is validated with experimental results and is capable of simulating the micro-damage evolution process as well as predicting the macro-mechanical degradation caused by the chemical corrosion. It is then applied to investigate chemical effects on crack initiation, propagation, coalescence, and the mechanical properties of the limestone containing pre-existing flaws. Microscale correlations are derived linking the crack propagation process, flaw distribution and the effects of chemical corrosion.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 Elsevier Ltd. This is an author produced version of a paper published in Engineering Fracture Mechanics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Distinct element method (DEM); Chemical effects; Nuclear Magnetic Resonance (NMR); Pre-existing flaw; Crack propagation |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Sep 2018 14:26 |
Last Modified: | 24 Sep 2019 00:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.engfracmech.2018.09.028 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:136152 |
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