University of Oulu

Wen, G.; Hu, J.; Wu, Y.; Zhang, Z.-X.; Xu, X.; Xiang, R. Mechanical Properties and Failure Behavior of Dry and Water-Saturated Foliated Phyllite under Uniaxial Compression. Materials 2022, 15, 8962.

Mechanical properties and failure behavior of dry and water-saturated foliated phyllite under uniaxial compression

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Author: Wen, Guanping1,2,3; Hu, Jianhua1,2,4; Wu, Yabin5;
Organizations: 1State Key Laboratory of Safety and Health for Metal Mines, Sinosteel Maanshan General Institute of Mining Research Co., Ltd., Maanshan 243000, China
2School of Resources and Safety Engineering, Central South University, Changsha 410083, China
3Oulu Mining School, University of Oulu, 90570 Oulu, Finland
4Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
5Changsha Institute of Mining Research Co., Ltd., Changsha 410012, China
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 52.1 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2022
Publish Date: 2023-06-02


Phyllite is widely distributed in nature, and it deserves to be studied considering rock engineering applications. In this study, uniaxial compression tests were conducted on foliated phyllite with different foliation angles under dry and water-saturated conditions. The impacts of water content and foliation angle on the stress–strain curves and basic mechanical properties of the Phyllite were analyzed. The experimental results indicate that the peak stress and peak strain decrease first and then increase with increasing foliation angle as a U-shape or V-shape, and the phyllite specimens are weakened significantly by the presence of water. Moreover, an approach with acoustic emission, digital image correlation, and scanning electron microscopic is employed to observe and analyze the macroscopic and mesoscopic failure process. The results show that tensile microcracks dominate during the progressive failure of phyllite, and their initiation, propagation, and coalescence are the main reasons for the failure of the phyllite specimens. The water acts on biotite and clay minerals that are main components of phyllite, and it contributes to the initiation, propagation, and coalescence of numerous microcracks. Finally, four failure modes are classified as followed: (a) for the specimens with small foliation angles α = 0° or 30° (Saturated), both shear sliding and tensile-split across the foliation planes; (b) for the specimens with low to medium foliation angles α = 30° (Dry) or 45°(Saturated), shear sliding dominates the foliation planes; (c) for the specimens with medium to high foliation angles α = 45° (Dry) or 60°, shear sliding dominates the foliation planes; (d) for the specimens with high foliation angles α = 90°, tensile-split dominates the foliation planes.

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Series: Materials
ISSN: 1996-1944
ISSN-E: 1996-1944
ISSN-L: 1996-1944
Volume: 15
Issue: 24
Article number: 8962
DOI: 10.3390/ma15248962
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
1171 Geosciences
Funding: This research was funded by the National Natural Science Foundation of China, grant number 52274182 (J.H.); the State Key Laboratory of Safety and Health for Metal Mines, grant number 2019-JSKSSYS-01 (J.H.); Hunan Provincial Innovation Foundation for Postgraduate grant number CX20220125 (G.W.); Fundamental Research Funds for Central Universities of the Central South University, China, grant number 2022zzts033 (G.W.); Open-End Fund for the Valuable and Precision Instruments of Central South University, grant number CSUZC202035 (G.W.).
Dataset Reference: The data used to support the findings of this study are available from the corresponding author upon request.
Copyright information: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (