Article (Scientific journals)
Three-dimensional DEM investigation of the fracture behaviour of thermally degraded rocks with consideration of material anisotropy
Shang, J.; Jayasinghe, Laddu Bhagya; Xiao, F. et al.
2019In Theoretical and Applied Fracture Mechanics, 104
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Keywords :
Anisotropic rock; Discrete Element Method; Fracture behaviour; Rock discontinuity; Temperature; Anisotropy; Finite difference method; Fracture mechanics; Sandstone; Stress-strain curves; Effects of temperature; Fracture characteristics; Laboratory experiments; Numerical investigations; Stress-strain relationships; Fracture
Abstract :
[en] A complete understanding of the fracture behaviour of anisotropic rocks under elevated temperatures is fundamentally important for rock and reservoir engineering applications. This paper shows a three-dimensional numerical investigation of the fracture behaviour of anisotropic sandstone, with consideration of the effects of temperature and material anisotropy. In the study, a 3D semi-circular bend (SCB) model was established by using the Discrete Element Method (DEM). The thermal responses of different minerals and the strength anisotropy of incipient bedding planes were considered in the model. The DEM model was calibrated against a series of laboratory experiments on Midgley Grit sandstone (MGS) that exhibits intrinsic anisotropy. The pure mode I, mode II, and mixed-mode (I+II) fracture characteristics of the MGS were investigated under elevated temperatures (up to 600 �C) using the established DEM model. The thermal degradation (i.e., fracturing) of the rock, the fracture load, the evolution of micro-cracks, and the stress-strain relationship around notch tips were analysed, with emphasis on enlightening the micro-mechanisms underlying the fracture behaviour. The results of the study were discussed and then compared with experimental observations and theoretical predictions. � 2019 Elsevier Ltd
Disciplines :
Civil engineering
Identifiers :
eid=2-s2.0-85070928674
Author, co-author :
Shang, J.;  Nanyang Centre for Underground Space, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore
Jayasinghe, Laddu Bhagya ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Xiao, F.;  Nanyang Centre for Underground Space, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore
Duan, K.;  School of Civil Engineering, Shandong University, China
Nie, W.;  Nanyang Centre for Underground Space, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore
Zhao, Z.;  Nanyang Centre for Underground Space, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore
External co-authors :
yes
Language :
English
Title :
Three-dimensional DEM investigation of the fracture behaviour of thermally degraded rocks with consideration of material anisotropy
Publication date :
2019
Journal title :
Theoretical and Applied Fracture Mechanics
ISSN :
0167-8442
Publisher :
Elsevier B.V.
Volume :
104
Peer reviewed :
Peer Reviewed verified by ORBi
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since 27 October 2020

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