Abstract
The pressurized water-rock coupling has a great influence on the long-term stability of rock engineering. In order to study the effect of axial and hydraulic pressure coupling on the creep behaviors of rock, a multi-channel fluid-solid coupling rock rheology system was used to carry out multi-loading creep experiments on the creep behaviors of sandstone. In view of the creep behaviors of the studied sandstone, a three-dimensional nonlinear Nishihara model considering hydraulic pressure was established, and the accuracy of the new model was verified. The research results showed that, with the increase of the hydraulic pressure, the creep strain of sandstone under both the same initial load and multi-step load decreased, whereas the rock creep strength and the maximum acceleration creep rate increased. Under the same hydraulic pressure and initial load, the creep strain increased with the multi-loading increasing, but the creep failure time became shorter. Through the parameter recognition of the newly proposed nonlinear creep model, the comparative analysis of theoretical and experimental results showed that the new creep model can well describe the creep behaviors of the sandstone under the pressurized water-rock coupling.
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Acknowledgements
The authors are grateful to Yang Liu for his linguistic assistance during the preparation of this manuscript.
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This work was supported by the National Nature Science Foundation of China (51804222) and the Youths Science Foundation of Wuhan Institute of Technology (18QD50).
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Writing–original draft, D.L. Writing-review and editing, Q.K. Data curation, W.Y. Investigation, S.Y. All authors have read and agreed to the published version of the paper.
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Liu, D., Yan, W., Yan, S. et al. Study on the effect of axial and hydraulic pressure coupling on the creep behaviors of sandstone under multi-loading. Bull Eng Geol Environ 80, 6107–6120 (2021). https://doi.org/10.1007/s10064-021-02337-9
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DOI: https://doi.org/10.1007/s10064-021-02337-9