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A Unified Strength criterion for rock material |
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| Authors: | Mao-Hong Yu Yue-Wen Zan Jian Zhao Mitsutoshi Yoshimine |
| Affiliation: | a Department of Civil Engineering, Xi’an Jiaotong University, 710049, Xi’an, China b School of Civil and Environmental Engineering, Nanyang Technological University, Singapore c College of Architecture and Civil Engineering, China University of Mining and Technology, Xuzhou, China d Department of Civil Engineering, Tokyo Metropolitan University, Japan |
| Abstract: | A non-linear Unified Strength criterion for rock material is presented. It is the development of the Unified Strength Theory (in: M. Jono, T. Inoue (Eds.), Mechanical Behaviour of Materials-VI (ICM-6), Pergamon, Oxford, 1991, pp. 841–846) and the modification of the Hoek–Brown strength criterion (Underground Excavations in Rock, The Institution of Mining and Metallurgy, London, 1980). The effect of intermediate principal stress on rock strength is considered in the non-linear Unified Strength criterion. The Hoek–Brown criterion is a single-shear strength criterion that forms the lower bound, and the non-linear twin-shear strength criterion forms the upper bound in the deviatoric plane. All the failure criteria ranging from the Hoek–Brown criterion (lower bound) and the non-linear twin-shear criterion (upper bound) and a series of criteria ranging between these two bounds may be introduced by the non-linear Unified Strength criterion. The theory can also be generalized to rock mass strength. |
| Keywords: | Strength criterion Rock material Single-shear strength criterion (Mohr–Coulomb strength criterion) Twin-shear strength criterion Unified Strength Theory Hoek–brown criterion Non-linear behaviour |
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