A study on stationary and nonstationary viscoelastic models of greenschist

Uniaxial compression creep tests have been performed on greenschist collected from the auxiliary tunnel at the Jinping II Hydropower Station in China. A few stationary and nonstationary viscoelastic models are used to fit the strain-time curves of the greenschist. There is a great difference between...

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Bibliographic Details
Published in:Arabian journal of geosciences 2015-05, Vol.8 (5), p.2477-2486
Main Authors: Xiong, L. X., Li, T. B., Yang, L. D., Yuan, X. W.
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
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Summary:Uniaxial compression creep tests have been performed on greenschist collected from the auxiliary tunnel at the Jinping II Hydropower Station in China. A few stationary and nonstationary viscoelastic models are used to fit the strain-time curves of the greenschist. There is a great difference between the model and test curves using the Hooke-Kelvin model or the Burgers model. Though some nonstationary viscoelastic models fit the test curves well, some parameters of these models have no physical meaning. The fitting accuracies of some expanded Hooke-Kelvin and expanded Burgers models in terms of the test curves are close to that of the six-component viscoelastic model (one Maxwell element in series with two Kelvin elements). The six-component viscoelastic model has fewer parameters, and each parameter has an exact physical meaning. Therefore, the six-component viscoelastic model is more suitable, in contrast to some nonstationary viscoelastic models, expanded Hooke-Kelvin models, and expanded Burgers models, for analyzing viscoelastic behaviors of rock of this type.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-014-1390-2