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| Citation: | Luo Zejun, Zhang Qingzhao, Shi Zhenming, Pan Qing, Yu Songbo, 2022. Shear Creep Characteristics of Red Sandstone Discontinuities Considering Different Morphologies. Earth Science, 47(12): 4484-4497. doi: 10.3799/dqkx.2022.315
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Engineering rock excavation will encounter a variety of complex stress conditions, and the rock will produce rheological phenomena over time under a loading effect. The "progressive damage" leads to landslides, collapses, large deformations and support difficulties in the engineering rock. In order to explain the rheological phenomena of natural rock discontinuities, the shear creep characteristics of the discontinuities of red sandstone are systematically studied based on the three-dimensional morphological scanning test and the graded loading shear creep test. It is found that the amount of creep deformation of the discontinuities is positively correlated with the creep stress and the three-dimensional morphological parameters of the discontinuities. The creep curve of the discontinuities can be divided into three stages, i. e. transition creep, steady-state creep and accelerated creep stage. When the normal stress is certain, the larger the three-dimensional morphological parameters of the discontinuities, the more intense the creep damage occurs. Based on the characteristics of shear creep curve and shear creep rate curve of the discontinuities, an empirical model of shear creep of the discontinuities is established with clear physical meaning of parameters.
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