Abstract
In order to investigate the effect of pore water pressure on the shear creep characteristics of structural plane, we have independently developed an integrated manufacturing die for structural plane and a multi-functional shear rheometer, meanwhile conducting shear creep of duplicated structural plane under osmotic pressure. The influence of pore water pressure on the shear creep seepage of a structural surface is analyzed. The test results show that a structural plane under different seepage water pressures has experienced an instantaneous-deformation stage, a decelerated-creep stage, a stable-creep stage, and an accelerated-creep stage. The increase of seepage water pressure promotes the development of nonlinear characteristics of the structural plane. In the stage of instantaneous deformation, the permeability of structural plane decreases to a certain extent compared with the initial permeability. In the stage of decay creep and stable creep, the permeability of the structural plane increases slowly and tends to be in a stable state. In the stage of accelerated creep, the permeability of the structural plane suddenly increases nonlinearly in a short time. Based on the nonlinear creep theory and fractional calculus theory, the viscous element of the creep model is replaced by a fractional viscous element, and a fractional nonlinear structural plane is established considering the effect of pore water pressure as well as stress damage. The model parameters are identified; meanwhile, the experimental curve is compared with the theoretical model curve to verify the correctness and applicability of the model. The research results provide some theoretical guidance for a long-term stability analysis of rock mass in water-rich areas.
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This work was supported by the National Natural Science Foundation of China (Nos. 52078093) and the Liao Ning Revitalization Talents Program (Nos. XLYC1905015).
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Zhang, F., Jiang, A. & Jiang, H. Study on shear creep-seepage characteristics of structural plane under pore water pressure. Arab J Geosci 16, 406 (2023). https://doi.org/10.1007/s12517-023-11472-4
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DOI: https://doi.org/10.1007/s12517-023-11472-4