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Influence of Loading and Unloading Stress Paths on the Deformation and Failure Features of Jinping Marble Under True Triaxial Compression

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Abstract

To study the difference in the failures of laboratories #7 and #8 of the China Jinping Underground Laboratory Phase II (CJPL-II), different loading and unloading stress path tests were carried out under a true triaxial compression condition based on the measured in situ stress of CJPL-II. The strength, deformation and failure mechanisms of Jinping marble under different stress paths were thoroughly investigated. The results showed that under the same stress state as that at sample failure, the bearing capacity and deformation of the unloading stress path were greater than those of the loading stress path. The bearing capacity and deformation in the σ2 and σ3 directions of stress path II and stress path III were similar, and the others decreased from stress path IV to stress path V under unloading conditions. The failure mode results reflect the violence of the unloading failure. The failure features and mechanisms of different stress paths were analysed though the acoustic emission (AE) ring, cumulative energy and strain energy trend. This research may provide a reference for the excavation and support of deep underground works.

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Acknowledgements

The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China under Grant Nos. 51621006 and 51839003. The authors are grateful to Dr. Yangyi Zhou, Mr. Yan Zhang, Mr. Qiang Han, Mr. Rui Kong, Mr. Liangjie Gu at Northeastern University, China, and Dr. Shili Qiu, Mr. Zhaofeng Wang at Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, for their valuable discussions and generous assistance with the laboratory tests.

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Authors and Affiliations

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

    Xia-Ting Feng, Hong Xu, Chengxiang Yang & Xiwei Zhang

  2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Yaohui Gao

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  1. Xia-Ting Feng
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  2. Hong Xu
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  3. Chengxiang Yang
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  4. Xiwei Zhang
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  5. Yaohui Gao
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Correspondence to Xia-Ting Feng.

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Feng, XT., Xu, H., Yang, C. et al. Influence of Loading and Unloading Stress Paths on the Deformation and Failure Features of Jinping Marble Under True Triaxial Compression. Rock Mech Rock Eng 53, 3287–3301 (2020). https://doi.org/10.1007/s00603-020-02104-4

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