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Implication of Different Types of Post-peak Behaviour in Lateral Direction on Failure of Class II Rocks in Uniaxial Compression
The rock samples were tested in uniaxial compression under lateral strain control. The results present Class II stress-strain curves in the axial direction. However, in the lateral direction, two types of post-peak curves were identified. The dilating behaviour (here called Type I) is characterized by the significant irreversible increase of the lateral strain before and after the peak stress. After the peak stress, the lateral strain keeps increasing without obvious axial stress drop over a relatively large lateral strain. For collapsing behaviour (here called Type II), the stress-strain curve presents brittle response in the lateral direction up to the peak stress. After the peak the stress drops immediately, representing an infinitesimal increase in lateral strain. To investigate the implication of both types of behaviour on the ejection of the rock fragments after peak, the uniaxial compression tests using the axial displacement-control method were carried out while capturing the rock failure behaviour with the aid of high-speed cameras. It was found that rocks with Type I dilating behaviour are more likely to have splitting or spallation (the fractures are parallel to the loading direction) failure; while for Type II collapsing behaviour, the inclined fractures are more likely to be induced. These results highlight the importance of investigating the lateral stress-strain curves of rocks.
Implication of Different Types of Post-peak Behaviour in Lateral Direction on Failure of Class II Rocks in Uniaxial Compression
The rock samples were tested in uniaxial compression under lateral strain control. The results present Class II stress-strain curves in the axial direction. However, in the lateral direction, two types of post-peak curves were identified. The dilating behaviour (here called Type I) is characterized by the significant irreversible increase of the lateral strain before and after the peak stress. After the peak stress, the lateral strain keeps increasing without obvious axial stress drop over a relatively large lateral strain. For collapsing behaviour (here called Type II), the stress-strain curve presents brittle response in the lateral direction up to the peak stress. After the peak the stress drops immediately, representing an infinitesimal increase in lateral strain. To investigate the implication of both types of behaviour on the ejection of the rock fragments after peak, the uniaxial compression tests using the axial displacement-control method were carried out while capturing the rock failure behaviour with the aid of high-speed cameras. It was found that rocks with Type I dilating behaviour are more likely to have splitting or spallation (the fractures are parallel to the loading direction) failure; while for Type II collapsing behaviour, the inclined fractures are more likely to be induced. These results highlight the importance of investigating the lateral stress-strain curves of rocks.
Implication of Different Types of Post-peak Behaviour in Lateral Direction on Failure of Class II Rocks in Uniaxial Compression
Springer Ser.Geomech.,Geoengineer.
Pasternak, Elena (editor) / Dyskin, Arcady (editor) / Wang, H. (author) / Jeffcoat-Sacco, B. (author) / Dight, P. (author) / Dyskin, A. V. (author) / Pasternak, E. (author)
International Workshop on Bifurcation and Degradation in Geomaterials ; 2022 ; perth, WA, Australia
Multiscale Processes of Instability, Deformation and Fracturing in Geomaterials ; Chapter: 18 ; 173-181
2022-12-13
9 pages
Article/Chapter (Book)
Electronic Resource
English
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