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2 Journal of Theoretical and Applied Mechanics

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Research on creep-fatigue model of anchored jointed rock mass

Song Yang, Fan Bo, Li Yong-Qi, Wang He-Ping

Journal of Theoretical and Applied Mechanics

2023

Vol. 61 nr 1

163--173

To explore the mechanical response of anchored rock mass with an interaction of fatigue and creep, this paper selects the fatigue amplitude and fatigue frequency as influencing factors to carry out a fatigue-creep experiment of the anchored rock mass. Based on fractional order theory and binary perturbation theory, a new fractional order creep model is constructed. The results show that compared with the Burgers model, the newly proposed creep model can better describe the whole process of creep deformation of the anchored jointed rock mass under fatigue loading.

Study on the shear creep characteristics of anchored jointed rock masses under creep fatigue loading

Song Yang, Li Yong-Qi

Journal of Theoretical and Applied Mechanics

2022

Vol. 60 nr 4

625--635

To study creep characteristics of deep rock masses under low-frequency earthquakes and other loads, sandstone and marble samples were used to characterize soft rock and hard rock, respectively. Shear creep tests of anchored rock masses under fatigue loading were carried out by using the graded loading method. A new nonlinear rheological model was constructed to characterize mechanical properties of anchored rock masses under fatigue loading. Creep fatigue curves of soft rock and hard rock have clear creep characteristics including instantaneous, attenuation, steady-state and accelerated creep stages. This work provides new insights into the stability of rock masses.