THREE-PARAMETER CREEP DAMAGE CONSTITUTIVE MODEL AND ITS APPLICATION IN HYDRAULIC TUNNELLING

Authors

  • Luo Gang School of Highway, Chang’an University, Xi’an, Shanxi, 710064; China

DOI:

https://doi.org/10.14311/CEJ.2016.03.0013

Keywords:

Rheology; three-parameter H-K damage model; time-dependent deformation

Abstract

Rock deformation is a time-dependent process, generally referred to as rheology. Especially for soft rock strata, design and construction of tunnel shall take full account of rheological properties of adjoining rocks. Based on classic three-parameter HK model (generalized Kelvin model), this paper proposes a three-parameter H-K damage model of which parameters attenuate with increase of equivalent strain, provides attenuation equation of model parameters in the first, second and third stage of creep deformation and introduces equivalent strain threshold value. When the equivalent strain is greater than the threshold value, the third stage of accelerating creep will be conducted. The three-parameter H-K damage model is used for numerical calculation of finite difference method FLAC3D and deformation features of soft rock with time under high ground stress are described based on diversion tunnel project of Jinping Hydropower Station, of which model parameters can be obtained by back analysis according to measured site data and BP neural network.

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References

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Published

2016-10-31

How to Cite

Gang, L. (2016). THREE-PARAMETER CREEP DAMAGE CONSTITUTIVE MODEL AND ITS APPLICATION IN HYDRAULIC TUNNELLING. Stavební Obzor - Civil Engineering Journal, 25(3). https://doi.org/10.14311/CEJ.2016.03.0013

Issue

Vol. 25 No. 3 (2016)

Section

Articles

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