Abstract
The mechanical properties of rock materials are strongly affected by water. To investigate the time-dependent mechanical properties of the rock under the combined effect of a water-rich environment and long-term loading, graded unloading creep tests are conducted on shale in different water content states to investigate the effect of water saturation coefficients on the creep mechanical properties. The results show that the creep deformation of shale is impacted by both the confining pressure and the saturation coefficient. The creep deformation increases with the increase of the unloading confining pressure. The radial transient creep and steady-state creep are more obvious under the same deviatoric stress, and the creep deformation is much more than the axial. The creep deformation, average creep rate, and creep duration at each level all increase as the water saturation coefficient rises. Based on the results of graded creep tests, a nonlinear viscoelastic-plastic unloading creep constitutive model (UCCM) was established. It has been verified that the UCCM can describe the creep deformation laws of shale with different water saturation coefficients. The impact of deviatoric stress and water saturation coefficient on creep deformation is then examined using this model. The results of the study can serve as a theoretical foundation for analyses of rock works’ long-term stability in areas with plenty of water.
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This work is supported by the National Science and Technology Support Plan of China (No. 2020YFF0426370) and the Water Conservancy Technology Demonstration Project (No. SF-202010).
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Li, B., Yang, F., Du, P. et al. Study on the triaxial unloading creep mechanical properties and creep model of shale in different water content states. Bull Eng Geol Environ 81, 420 (2022). https://doi.org/10.1007/s10064-022-02902-w
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DOI: https://doi.org/10.1007/s10064-022-02902-w