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Erschienen in: Environmental Earth Sciences 6/2020

01.03.2020 | Original Article

Improved nonlinear Burgers shear creep model based on the time-dependent shear strength for rock

verfasst von: Hang Lin, Xing Zhang, Rihong Cao, Zhijie Wen

Erschienen in: Environmental Earth Sciences | Ausgabe 6/2020

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Abstract

Shear strength is an important mechanical index of rock. The adjustment and reorganization of rock structure can be reflected by the variation of shear strength. During rock rheology, the shear strength decreases with time due to rock damage. Therefore, from the point of difference of shear strength, the mechanical properties of rock can be effectively studied. In this paper, for the state of direct shear test, the Kachanov creep damage law was adopted to describe the time characteristics of the rock shear strength during the accelerated creep stage. A nonlinear viscoplastic element on the basis of time-dependent shear strength was established by connecting the plastic element representing shear strength with the viscous element in parallel. After introducing the nonlinear viscoplastic element into the classic Burgers model, the rationality of the model was verified by the shear creep test results of rock discontinuity. Results showed that the modified Burgers model can reflect the mechanical properties of rock in three creep stages. In addition, the model parameter δ can also reflect the evolution of internal cracks in rock during creep.

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Metadaten
Titel
Improved nonlinear Burgers shear creep model based on the time-dependent shear strength for rock
verfasst von
Hang Lin
Xing Zhang
Rihong Cao
Zhijie Wen
Publikationsdatum
01.03.2020
Verlag
Springer Berlin Heidelberg
Erschienen in
Environmental Earth Sciences / Ausgabe 6/2020
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI
https://doi.org/10.1007/s12665-020-8896-6

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