Abstract
In this study, based on true-triaxial compression tests, five typical post-peak brittle characteristics are summarized, and the stress dependence is observed. Next, the quantitative description of this stress-dependent post-peak brittle characteristic is theoretically discussed. Then, combining the cluster analysis and the artificial recognition results on the brittleness, a new quantitative universal classification method based on stress-dependent brittleness is proposed, which is suitable for numerous hard rock types, with fewer parameters involved. Through implemented code and application to the actual field case, it is found that this stress-dependent post-peak characteristics model causes the higher energy concentration to occur at a deeper location comparing to traditional stress-independent models. The significance of the hard rock engineering is discussed, and the results indicate that it is necessary to consider the true-triaxial stress state of the rock mass and the influence of intermediate and minor principal stresses to the post-peak behaviour cannot be neglected. Finally, it is suggested to adopt the stress-dependent post-peak characteristic model in the design process of hard rock engineering, particularly for cases under high stress or severe engineering hazards such as rockbursts, which require more accurate calculation and prediction with lower error allowance.
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Acknowledgements
This work was funded by the National Natural Science Foundation of China (Grant Nos. 52125903, 51621006). We would like to thank Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University for giving us the opportunities to conduct the experimental and simulating tests. Appreciation is extended to all the teachers and staffs here.
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Wang, Z., Pan, PZ. & Yang, S. Quantitative description of stress-dependent post-peak brittle characteristics and numerical implementation. Bull Eng Geol Environ 81, 451 (2022). https://doi.org/10.1007/s10064-022-02919-1
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DOI: https://doi.org/10.1007/s10064-022-02919-1