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Evaluation of the Crack Propagation Capacity of Hard Rock Based on Stress-Induced Deformation Anisotropy and the Propagation Angle of Volumetric Strain

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Abstract

The occurrence of various types of disasters in deep underground engineering is related not only to the strength of the rock mass but also to the crack propagation capacity (CPC) under corresponding stress conditions. The deep-seated rock mass is generally in the stress state of σ1 > σ2 > σ3, and the CPC under differential stress is very important to evaluate the brittle failure of rock. Therefore, based on the deformation characteristics of Baihetan (BHT) basalt under true triaxial compression (TTC), the evaluation index (IP) of the CPC is established, which considers the characteristics of stress-induced deformation anisotropy and the propagation angle of volumetric strain. The evaluation indexes of JP marble, BS granite and BHT basalt under TTC are analysed and compared. When the stress exceeds the crack initiation stress, the evaluation index of the CPC decreases with the increase of σ2, but increases with the increase of σ3, and the effect of σ3 on the CPC index is greater than that of σ2. Under TTC, the CPC of JP marble is the largest, followed by that of BS granite and BHT basalt. The analysis shows that the evaluation index (IP) proposed in this study is also suitable for conventional triaxial compression and uniaxial compression conditions. In addition, the test result shows that there is divisibility between the failure mode and IP under TTC. The relationship between IP and the failure mode of BHT basalt shows that splitting failure occurs when IP < 0.3, that shear failure occurs when IP > 0.4, and mixed failure occurs when IP is between these values. The evaluation index of the CPC proposed in this paper can provide a theoretical reference for evaluating the failure of surrounding rock near the opening boundary of deep underground rock engineering.

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Acknowledgements

The authors sincerely acknowledge the financial support from the National Natural Science Foundation of China under Grant No. 51839003, the 111 Project under Grant No. B17009 and the Liao Ning Revitalization Talents Program under Grant No. XLYC1801002. The authors are grateful to Prof. Xiwei Zhang, Mr. Zhaofeng Wang, Mr. Yaohui Gao, Mr. Hong Xu, Mr. Zhi Zheng, Mr. Gang Wang, Mr. Liangjie Gu, Ms. Xinyue Wang and for their great assistance. The authors would also like to thank the journal editors and anonymous reviewers for their valuable suggestions.

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  1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, 110819, Liaoning, China

    Qiang Han, Xia-Ting Feng, Chengxiang Yang, Rui Kong, Jun Zhao & Yan Zhang

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  1. Qiang Han
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  2. Xia-Ting Feng
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  3. Chengxiang Yang
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  4. Rui Kong
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  5. Jun Zhao
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  6. Yan Zhang
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Correspondence to Xia-Ting Feng.

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Han, Q., Feng, XT., Yang, C. et al. Evaluation of the Crack Propagation Capacity of Hard Rock Based on Stress-Induced Deformation Anisotropy and the Propagation Angle of Volumetric Strain. Rock Mech Rock Eng 54, 6585–6603 (2021). https://doi.org/10.1007/s00603-021-02623-8

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