Investigation on Crack Coalescence Behaviors for Granite Containing Two Flaws Induced by Cyclic Freeze-Thaw and Uniaxial Deformation in Beizhan Iron Mining, Xinjing, China
Joint Authors
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-19, 19 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-02-06
Country of Publication
Egypt
No. of Pages
19
Main Subjects
Abstract EN
This work is aimed at investigating the effect of freeze-thaw (F-T) cycle on the crack coalescence behavior for granite samples containing two unparallel flaws under uniaxial compression.
The flaw geometry in the samples was a combination of an upper inclined flaw with a horizontal flaw underneath.
After the uniaxial compression experiments, macroscopic crack pattern description and the mesoscopic posttest CT imaging were used to reveal the effects of F-T cycle on the crack coalescence morphology at the rock bridge area.
Results show that the stress–strain curves present a fluctuating growth trend and stress drop phenomenon becomes weaker with increasing F-T cycles.
In addition, three different kinds of cracks (tensile-wing cracks, oblique shear cracks, and antiwing cracks) were observed, and the crack coalescence pattern was influenced by the F-T cycles and approach angle.
A mix of tensile and shear failure occurs for the sample subjected to weak F-T treatment, and simple tensile failure occurs for the sample subjected to high F-T treatment.
Moreover, CT imaging reveals a crack network pattern at the rock bridge area, and it is found that the fracture degree deceases with increasing F-T cycles and increases with the increasing approach angle.
It suggests that the rock bridge area can be easily fractured for the sample subjected to high F-T cycles.
Results of this study can provide theoretical foundation for the instability predication of fractured rock structures in cold regions.
American Psychological Association (APA)
Wang, Yu& Li, C. H.. 2020. Investigation on Crack Coalescence Behaviors for Granite Containing Two Flaws Induced by Cyclic Freeze-Thaw and Uniaxial Deformation in Beizhan Iron Mining, Xinjing, China. Geofluids،Vol. 2020, no. 2020, pp.1-19.
https://search.emarefa.net/detail/BIM-1165141
Modern Language Association (MLA)
Wang, Yu& Li, C. H.. Investigation on Crack Coalescence Behaviors for Granite Containing Two Flaws Induced by Cyclic Freeze-Thaw and Uniaxial Deformation in Beizhan Iron Mining, Xinjing, China. Geofluids No. 2020 (2020), pp.1-19.
https://search.emarefa.net/detail/BIM-1165141
American Medical Association (AMA)
Wang, Yu& Li, C. H.. Investigation on Crack Coalescence Behaviors for Granite Containing Two Flaws Induced by Cyclic Freeze-Thaw and Uniaxial Deformation in Beizhan Iron Mining, Xinjing, China. Geofluids. 2020. Vol. 2020, no. 2020, pp.1-19.
https://search.emarefa.net/detail/BIM-1165141
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1165141