Hydro-mechanical modelling and analysis of multi-stage tunnel excavations using a smoothed excavation method

Song, Fei; Rodríguez-Dono, Alfonso; Olivella, S.

doi:10.1016/j.compgeo.2021.104150

Cited by 20 publications

(9 citation statements)

References 61 publications

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“…According to the Perzyna-type viscoplastic model [27][28][29], the viscoplastic strain rate . ε vp ij can be expressed as…”

Section: Elastic-viscoplastic Constitutive Formulationmentioning

confidence: 99%

A Viscoplasticity Model for Shale Creep Behavior and Its Application on Fracture Closure and Conductivity

Li,

Zhao,

Guo

et al. 2024

Energies

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Hydraulic fracturing is the main means for developing low-permeability shale reservoirs. Whether to produce artificial fractures with sufficient conductivity is an important criterion for hydraulic fracturing evaluation. The presence of clay and organic matter in the shale gives the shale creep, which makes the shale reservoir deform with time and reduces the conductivity of the fracture. In the past, the influence of shale creep was ignored in the study of artificial fracture conductivity, or the viscoelastic model was used to predict the conductivity, which represents an inaccuracy compared to the actual situation. Based on the classical Perzyna viscoplastic model, the elasto-viscoplastic constitutive model was obtained by introducing isotropic hardening, and the model parameters were obtained by fitting the triaxial compression creep experimental data under different differential stresses. Then, the constitutive model was programmed in a software platform using the return mapping algorithm, and the model was verified through the numerical simulation of the triaxial creep experiment. Then, the creep calculation results of the viscoplastic constitutive model and the power law model were compared. Finally, the viscoplastic constitutive model was applied to the simulation of the long-term conductivity of the fracture to study the influence of creep on the fracture width, and sensitivity analysis of the influencing factors of the fracture width was carried out. The results show that the numerical calculation results of the viscoplastic model were in agreement with the experimental data. The decrease in fracture width caused by pore pressure dissipation and reservoir creep after 72 h accounts for 32.07% of the total fracture width decrease.

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“…According to the Perzyna-type viscoplastic model [27][28][29], the viscoplastic strain rate . ε vp ij can be expressed as…”

Section: Elastic-viscoplastic Constitutive Formulationmentioning

confidence: 99%

A Viscoplasticity Model for Shale Creep Behavior and Its Application on Fracture Closure and Conductivity

Li,

Zhao,

Guo

et al. 2024

Energies

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“…In Equation (11), H(σ r , η p ) = (N(η) − 1)σ r + Y(η), whereas the most extensively accepted deviatoric plastic strain η p , regarded as the strain-softening parameter, can be determined by the difference between the circumferential plastic strain ε p θ and radial plastic strain ε p r . The expression can be defined as [24]:…”

Section: Strain-softening Modelmentioning

confidence: 99%

“…Many recent studies have proposed analytical solutions for models of complete elasto-plasticity, elasto-brittleness, and strain-softening of surrounding rock using the Mohr-Coulomb (M-C) yield criterion or Hoek-Brown (H-B) yield criterion [4][5][6][7][8][9][10][11][12][13]. Although these studies are of practical and theoretical value, they do not consider the effect of intermediate principal stress on the deformation and failure resulting from tunnel excavation.…”

Section: Introductionmentioning

confidence: 99%

A Proposed Algorithm to Compute the Stress-Strain Plastic Region and Displacement of a Deep-Lying Tunnel Considering Intermediate Stress and Strain-Softening Behavior

Shen

et al. 2021

Applied Sciences

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Past studies on deep-lying tunnels under the assumption of plane strain have generally neglected the influence of intermediate principal stress even though this affects the surrounding rocks in the plastic zone. This study proposes a finite difference method to compute the stress strain plastic region and displacement of a tunnel based on the Drucker–Prager (D–P) yield criterion and non-associated flow rule and considering the influences of intermediate principal stress and the strain-softening behavior of surrounding rock. The computed results were compared with those of other well-known solutions and the accuracy and validity of the method were confirmed through some examples. Parameter analysis was conducted to investigate the effects of intermediate principal stress on stress-strain, the plastic region, the ground response curve, and the dilatability of surrounding rock. The results showed that the plastic radius , the residual radius , and radial displacement of surrounding rock first decreased and then increased with increasing intermediate principal stress coefficient b from 0 to 1, with the minimums occurring at b = 0.75. On the contrary, the peak and rate of variation of the dilatancy coefficient first increased and then decreased with increasing b and the dilatancy coefficient gradually transitioned from nonlinear to linear variation. Meanwhile, the inhibition of the plastic radius and radial displacement gradually weakened with increasing support pressure, whereas the dilatancy coefficient of the tunnel opening gradually increased.

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“…Finally, parametric analyses have been carried out to investigate the influence of different factors on tunnelling responses, including the selection of different 2021; Tarifard et al 2022). However, it is not easy to analyse the tunnelling response due to the use of inadequate geomaterial models or due to the limited numerical approaches (Lade 1993;Rodriguez-Dono 2011;Paraskevopoulou 2016;Dong et al 2021;Song 2021;Song et al 2021a;Fan et al 2022). Many different types of geomaterials are prone to exhibit timedependent behaviour as well as anisotropy (Kolymbas et al 2006;Mánica 2018).…”

Section: Introductionmentioning

confidence: 99%

Modelling underground excavations in rock masses with anisotropic time-dependent behaviour

Song

Rodríguez-Dono

Farfan

2022

Geomech. Geophys. Geo-energ. Geo-resour.

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When modelling rock masses that behave anisotropically and in addition present a time dependent behaviour, it is relevant to select a constitutive model able to represent their actual behaviour realistically. This article presents an alternative anisotropic time-dependent constitutive model able to predict the coupling between anisotropic behaviour and time-dependent (or viscous) behaviour. The viscous behaviour is simulated with the Burgers model and all elastic springs and viscous dashpots are considered to exhibit transversely isotropic properties. The proposed constitutive model has been implemented in the finite element method software CODE_BRIGHT. To verify the basic anisotropic elastic solution, it has been compared with that of PLAXIS results. And to verify the isotropic viscoelastic solution, it has been compared with analytical solutions. Furthermore, the proposed constitutive model has been used to predict the behaviour of samples from laboratory tests. Finally, parametric analyses have been carried out to investigate the influence of different factors on tunnelling responses, including the selection of different constitutive models, anisotropy of initial stresses and anisotropy of material properties. The proposed model provides an alternative method for the preliminary design of geotechnical engineering works involving geomaterials that exhibit anisotropic time-dependent behaviour.Article highlights • An anisotropic time-dependent model has been implemented in CODE_BRIGHT and validated. • The model can predict the coupled anisotropic time-dependent behaviour of geomaterials. • Parametric analyses have been performed to study the influence of different factors in ground response.

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Hydro-mechanical modelling and analysis of multi-stage tunnel excavations using a smoothed excavation method

Cited by 20 publications

References 61 publications

A Viscoplasticity Model for Shale Creep Behavior and Its Application on Fracture Closure and Conductivity

A Viscoplasticity Model for Shale Creep Behavior and Its Application on Fracture Closure and Conductivity

A Proposed Algorithm to Compute the Stress-Strain Plastic Region and Displacement of a Deep-Lying Tunnel Considering Intermediate Stress and Strain-Softening Behavior

Modelling underground excavations in rock masses with anisotropic time-dependent behaviour

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