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A rheological constitutive model for damaged zone evolution of a tunnel considering strain hardening and softening

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Abstract

A rheological constitutive model for damaged zone evolution of a tunnel is proposed in this paper to describe the strain hardening and softening properties of the excavation-disturbed rock mass. Firstly, the one-dimension rheological model is introduced by connecting the improved St. Venant body with the Nishihara model, and this model can be used to describe the whole process including transient viscoplastic creep under a low-stress state, steady-state and accelerative creep under a high-stress state. Secondly, the constitutive equations of the rheological model under three-dimensional condition of the improved St. Venant body based on generalized plasticity potential theory are deduced, and the generic three-dimensional rheological model is developed. Thirdly, the creep and stress relaxation properties of the rheological model are studied and discussed. Furthermore, numerical analysis of triaxial compression tests and triaxial compression creep tests are conducted and the rheological model are validated. The results show that the rheological model can be used to study the evolution of excavation damaged zone in underground tunnel engineering.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51934003, 51774020 and U1204509), Program for Yunnan Thousand Talents Plan High-level Innovation and Entrepreneurship Team, and Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province.

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Authors and Affiliations

  1. College of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou, 450007, China

    Zhizeng Zhang

  2. Department of Hydraulic and Hydropower Engineering, Tsinghua University, Beijing, 100084, China

    Xiaoli Liu

  3. PowerChina Chengdu Engineering Corporation Limited, Chengdu, 610072, Sichuan Province, China

    Lijuan Cheng

  4. Kunming University of Science and Technology, Kunming, 650093, China

    Shunchuan Wu

  5. R&D Department, State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou, 450001, China

    Bing Zhang

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  1. Zhizeng Zhang
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  2. Xiaoli Liu
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  3. Lijuan Cheng
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  4. Shunchuan Wu
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  5. Bing Zhang
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Correspondence to Xiaoli Liu.

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Zhang, Z., Liu, X., Cheng, L. et al. A rheological constitutive model for damaged zone evolution of a tunnel considering strain hardening and softening. Geomech. Geophys. Geo-energ. Geo-resour. 6, 56 (2020). https://doi.org/10.1007/s40948-020-00181-x

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