A thermomechanical model for argillaceous rocks

Tourchi, Saeed; Gens, Antonio; Vaunat, Jean; Mánica, Miguel A.; Scaringi, Gianvito

doi:10.1051/e3sconf/202020513014

Cited by 3 publications

(2 citation statements)

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“…10)As 𝑑𝜑 = 𝑑𝜑(𝑑 𝜀 𝑒𝑞 𝑝 , 𝑑 𝑇) and 𝑑𝑐 = 𝑑𝑐(𝑑 𝜀 𝑒𝑞 𝑝 , 𝑑 𝑇) the plastic multiplier 𝜆, which controls the amount of the plastic strain rate, is affected by the change in 𝜑 and c(Tourchi et al, 2020): strain increment is affected by the thermal variation of internal friction and cohesion, as long as 𝜎 ′ ≠ 0. Otherwise, this dependence disappears, as for both forms of the yield locus 𝜕𝜑 𝜕𝑇 ⁄…”

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confidence: 99%

Thermo-hydro-mechanical simulation of deep excavations in claystone

Tourchi,

Manica Malcom,

Vaunat

et al. 2023

Preprint

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The paper is centred on the enhancement of an existing hydro-mechanical model for argillaceous hard soilsweak rocks to provide predictive capability with respect to temperature evolution in the light of new experimental evidence. A number of developments of the original temperature-independent formulation are proposed. In particular, functions describing the yield locus, stiffness and strength parameters are improved to consider the elastic domain shrinking and the degradation of stiffness and strength parameters with temperature elevation. The developed thermo-mechanical constitutive model is applied, via a suitable coupled THM formulation, to the coupled THM analysis of an in-situ heating test performed in the Meuse/Haute-Marne Underground Research Laboratory. The relevance and importance of the temperature effect in the damaged zone around the in-situ heating tunnel are clearly demonstrated.

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confidence: 99%

Thermo-hydro-mechanical simulation of deep excavations in claystone

Tourchi,

Manica Malcom,

Vaunat

et al. 2023

Preprint

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“…Figure12: Model geometry, boundary conditions and finite element mesh employed(Tourchi et al, 2020).…”

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A thermomechanical model for argillaceous hard soils–weak rocks: application to THM simulation of deep excavations in claystone

Tourchi,

Mánica,

Gens

et al. 2023

Géotechnique

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The paper presents the enhancement of an existing constitutive model for argillaceous hard soils-weak rocks to incorporate non-isothermal conditions to be used in coupled thermo-hydro-mechanical (THM) simulations of underground excavations subjected to temperature variations within the context of deep geological nuclear waste disposal. The proposed thermo-elastoplastic extension accounts for the effect of temperature on the yield and plastic potential functions and on the elastic stiffness. The resulting model is validated through the simulation of relevant non-isothermal laboratory tests reported in the literature. The model is then applied to the coupled THM simulation of an in situ heating test conducted at the Meuse/Haute-Marne underground research laboratory in Bure, France, excavated in the Callovo-Oxfordian claystone. Results show that the incorporation of thermal effects into the constitutive description of the host rock plays a significant role in the behaviour of the excavation when subjected to thermal loading, particularly in the evolution of the excavation fractured zone.

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A thermomechanical model for argillaceous hard soils - weak rocks: application to THM simulation of deep excavations in claystone

Tourchi¹,

Malcom²,

Vaunat³

et al. 2023

Preprint

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The paper presents the enhancement of an existing constitutive model for argillaceoushard soils-weak rocks for non-isothermal conditions, to be used in coupledthermo-hydro-mechanical (THM) simulations of underground excavations subjected totemperature variations within the context of deep geological nuclear waste disposal. Theproposed thermo-elastoplastic extension accounts for the effect of temperature on theyield and plastic potential functions, and on the elastic stiffness. The resulting modelis validated through the simulation of relevant non-isothermal laboratory tests reportedin the literature. The model is then applied to the coupled THM simulation of an insitu heating test conducted at the Meuse/Haute-Marne underground research laboratory,in Bure, France, excavated in the Callovo-Oxfordian claystone. Results show that theincorporation of thermal effects into the constitutive description of the host rock playsa significant role in the behaviour of the excavation when subjected to thermal loading,particularly in the evolution of the excavation damaged zone.

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A thermomechanical model for argillaceous rocks

Cited by 3 publications

References 3 publications

Thermo-hydro-mechanical simulation of deep excavations in claystone

Thermo-hydro-mechanical simulation of deep excavations in claystone

A thermomechanical model for argillaceous hard soils–weak rocks: application to THM simulation of deep excavations in claystone

A thermomechanical model for argillaceous hard soils - weak rocks: application to THM simulation of deep excavations in claystone

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