Luo Gang, Chen Liang
Three-parameter creep damage constitutive model and its application in hydraulic tunnelling
Číslo: 3/2016
Periodikum: Civil Engineering Journal
DOI: 10.14311/CEJ.2016.03.0013
Klíčová slova: Reologie; Tříparametrový model poškození H-K; Časově závislé deformace
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Anotace:
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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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.