Abstract
Asymmetrical large deformation problem of quartz mica schist is anticipated in a planning hydropower station. The objective of this study was to investigate the anisotropic mechanical properties of the schist under complex stress states. For this purpose, a series of true triaxial compression tests accompanied by acoustic emission monitoring were carried out on this schist with different loading angles with respect to inherent schistosity. The test results show that the orientation of schistosity and stress state have a significant impact on the deformation, strength and failure of this schist. More specifically, when the σ2 is parallel to the strike of the schistosity (ω = 0°), the failure of the specimen is mainly controlled by the schistosity structure, and the strength is lower compared with the case of σ2 perpendicular to the strike (ω = 90°). When ω = 90°, the deformation normal to schistosity is more restrained, and the acoustic emission impact mostly presents the phenomenon of concentration and sudden increase during the fracture. The test results indicate that the normal stress constraint effect on the schistosity can effectively improve the strength and inhibit the shear or splitting failure along the schistosity, hence, the tunnel axis should be at a large angle with the strike of schistosity, and support measures should be applied on schistosity as soon as possible after excavation.
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Chinese Natural Science Foundation with the Grant Nos. 52079027, 51709043.
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Xufeng Liu and Yangyi Zhou wrote the main manuscript text. Dingping Xu wrote the rock mass failure part. All authors reviewed the manuscript.
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Liu, X., Zhou, Y. & Xu, D. Anisotropic mechanical properties of quartz mica schist subjected to true triaxial compression. Environ Earth Sci 82, 204 (2023). https://doi.org/10.1007/s12665-023-10886-3
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DOI: https://doi.org/10.1007/s12665-023-10886-3