Nonlinear Creep Model for Rocks Considering Damage Evolution Based on the Modified Nishihara Model
Publication: International Journal of Geomechanics
Volume 21, Issue 8
Abstract
In general, the microdefects in rocks obey Weibull distribution. Based on the laws of statistics of microdefects in rocks, the relationship between the damage and the strain is established. Moreover, by considering characteristics of the viscoelastic–plastic and the damage evolution in rocks, a nonlinear creep model for rocks considering damage evolution is proposed to predict the creep behaviors of rocks based on the modified Nishihara model. In the proposed model, a dashpot element and a nonlinear viscoplastic body are added into the classical Nishihara model to simulate the accelerating creep stage of soft rocks. Moreover, the damage of rocks is considered in the process of creep. The effects of the shape parameter, the scale parameter, the peak stress, the peak strain, and the confining stress on the damage are investigated using the proposed method. The novel model is suitable to predict the creep behaviors of hard rocks and soft rocks simultaneously, and the difficulty to simulate the accelerating creep stage using the traditional creep model is overcome. To verify the robustness and precision of the proposed model, the creep behaviors of granite, coal, and red sandstone at different stresses are investigated. The predicted creep behaviors of soft and hard rocks using the proposed method are in good agreement with the experimental data, especially for the nonlinear accelerating creep stage.
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Acknowledgments
The work is supported by the National Natural Science Foundation of China (Nos. 51839009, 52027814 and 51809198), Fundamental Research Funds for the Central Universities (No. 2042018kf0008).
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Published In
International Journal of Geomechanics
Volume 21 • Issue 8 • August 2021
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© 2021 American Society of Civil Engineers.
History
Received: Oct 18, 2020
Accepted: Feb 25, 2021
Published online: May 21, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 21, 2021
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