Abstract
To explore the mechanical properties of fractured rock masses under complex stress paths, shear creep tests on marble under different fatigue conditions were conducted; the effects of variations in fatigue frequency and fatigue amplitude on the creep characteristics of rock are discussed. The results show that with increasing fatigue amplitude, the shear failure strength of specimens presents a parabolic trend that first increases and then decreases. Different fatigue frequencies lead to changes in the failure mode of the joint surface; with increasing fatigue frequency, the failure mode of the main crack on the joint surface changes from “V” to “I” to “T”. Finally, when the fatigue frequency is increased, the failure mode of the joint surface changes from “V” to “T”. When the fatigue frequency reaches 0.5 Hz, the failure mode is “X”. The damage shear modulus function under the influence of fatigue loading is introduced into the improved Nishihara model. Thus, a constitutive model describing the rock under fatigue loading is constructed, and the accuracy and applicability of the model are verified by laboratory tests. The model provides a new idea for the stability reinforcement of rock masses.
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Acknowledgments
The research described in this paper was financially supported by the National Natural Science Foundation (51974146, 52174078), Liaoning Natural Science Foundation (2019-ZD-0042), Innovative Talents Support Program for Universities in Liaoning Province (21-1071) and Discipline Innovation team of Liaoning Technical University (LNTU20TD08).
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Song, Y., Li, Y.Q. Experimental Study on Shear Creep of a Deep Fractured Rock Mass Under a Fatigue Load. KSCE J Civ Eng 26, 4432–4443 (2022). https://doi.org/10.1007/s12205-022-1713-x
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DOI: https://doi.org/10.1007/s12205-022-1713-x