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Mechanism and Effect of Stress Level on the Generalized Relaxation Behavior of Tage Tuff Under Triaxial Compression

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Abstract

The time-dependent rheological deformation of rocks has significance in the stability of rock structures. The study of time-dependent rock behaviors is commonly conducted with creep or relaxation rheology tests in laboratories. In this study, generalized relaxation behavior, which indicates the strain and stress change simultaneously with time during rheology, is investigated to extend the aspects of the time dependency of rock. The definition and mechanism of generalized relaxation are explained with simple models. Then, triaxial generalized relaxation tests were performed under different stress levels. The results show that the evolution curves of strain and stress with time show similar tendencies with conventional creep or relaxation during generalized relaxation and can be described using a power function. As the stress level increases, the initial damage to the rock increases; moreover, variations in strain and stress and their rates increase, which are explained by crack propagation. Finally, the complete generalized relaxation curves are discussed and compared with the complete creep and relaxation curves. This study is significant for understanding the time-dependent behaviors of rock and stability analysis of underground rock structures.

Highlights

  • The definition and mechanism of generalized relaxation are explained with simple models.

  • The effect of stress level on generalized relaxation behavior of Tage tuff is studied under triaxial compression.

  • The evolution curves of generalized relaxation show similar tendencies to creep and relaxation.

  • The complete curves of generalized relaxation are obtained and three stages are divided.

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Funding

This work was supported by the China Postdoctoral Science Foundation (2021M693751), Natural Science Foundation of Chongqing, China (cstc2021jcyj-msxmX0354), Science and Technology Research Program of Chongqing Municipal Education Commission (KJQN202201314 and KJZD-K202201304), and Chongqing University of Arts and Sciences Foundation (P2021TM09).

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Authors and Affiliations

  1. School of Civil Engineering, Chongqing University of Arts and Sciences, Chongqing, 402160, China

    Yang Tang, Hailong Zhang, Seisuke Okubo & Xiaoxiao Guo

  2. School of Civil Engineering, Chongqing University, Chongqing, 400044, China

    Yang Tang, Hailong Zhang & Xinrong Liu

  3. Chongqing Three Gorges Water Conservancy and Electric Power Co. Ltd. 401121, Chongqing, China

    Yang Tang

  4. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China

    Jiang Xu & Shoujian Peng

Authors
  1. Yang Tang
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  2. Hailong Zhang
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  3. Jiang Xu
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  4. Xinrong Liu
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  5. Seisuke Okubo
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  6. Shoujian Peng
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  7. Xiaoxiao Guo
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Correspondence to Xiaoxiao Guo.

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All the authors contributed toward successfully conducting the study, and all authors approved the publication of the paper. The authors declare that there are no conflicts of interest regarding the publication of this paper.

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Tang, Y., Zhang, H., Xu, J. et al. Mechanism and Effect of Stress Level on the Generalized Relaxation Behavior of Tage Tuff Under Triaxial Compression. Rock Mech Rock Eng 56, 6173–6187 (2023). https://doi.org/10.1007/s00603-023-03395-z

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