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- Title
Characterization of the shear-creep behavior of rocks and modeling with viscoelastic–plastic rheological models.
- Authors
Li, H.; Yan, S. H.; Lv, Q.; Zhang, H.; Wu, L. Z.; Li, B.; Zhou, J. T.
- Abstract
Rheology-driven sliding is a key contributor to failure; thus, a comprehensive understanding of rock rheological processes is important. In this paper, shear creep on mudstone and sandstone was studied to examine the rock rheological behavior. The creep results show that the creep behavior becomes increasingly nonlinear over time. The plastic part of the Ramberg–Osgood model is improved with a new plastic rheological element, which is incorporated into the classic Nishihara model and Burgers model to fit the creep experimental results. The various viscoelastic–plastic rheological elements provide capabilities to describe the elastic, viscoelastic, viscous, and plastic deformations of the rocks. The models are compared with the Nishihara model and the Burgers model, and are validated by the rheological data. The results show that the new element can describe well the plastic behavior of the rocks. The proposed models provide an increased accuracy in describing the behavior in the three rheological stages (attenuated, steady-state, and accelerated-creep stages), which depend on the stress level and burial depth. The models can also effectively predict the failure time and long-term stability of rock slope.
- Subjects
CREEP (Materials); ROCK slopes; ROCK creep; MATERIAL plasticity; ROCK deformation; MUDSTONE
- Publication
Mechanics of Time-Dependent Materials, 2023, Vol 27, Issue 2, p275
- ISSN
1385-2000
- Publication type
Article
- DOI
10.1007/s11043-022-09583-8