Caractéristiques physiques et mécaniques du granite de la Vienne et de l’argilite de l’Est

Homand, Françoise; Chiarelli, Anne-Sophie; Hoxha, Dashnor

doi:10.3166/rfgc.6.11-20

Cited by 7 publications

(15 citation statements)

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“…6 (path B-C-D), the curves obtained are comparable to other data obtained on the COx claystone, with axial strains (perpendicular to bedding) larger than radial ones (e.g. Chiarelli et al 2003;Homand et al 2003;Zhang and Rothfuchs 2004;Hu et al 2014;Menaceur et al 2015). The corresponding stress path plotted in a q-p 0 diagram presented in Fig. 14 exhibits some small perturbations at the beginning of the test at low shear stress due to some technical problems with the PVC controlling the confining pressure, for q values smaller than 1.0 MPa.…”

Section: Discussionsupporting

confidence: 85%

On the Thermo-Hydro-Mechanical Behaviour of a Sheared Callovo-Oxfordian Claystone Sample with Respect to the EDZ Behaviour

et al. 2015

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International audienceTo better understand the impact of temperature elevation on the response of the excavation damaged zone around repository cells and galleries for radioactive waste disposal, the combined effects of shear and temperature elevation were investigated in the laboratory on the Cal-lovo-Oxfordian claystone. To do so, a hollow cylinder thermal triaxial cell with short drainage path specifically developed for low permeability rocks was used. Once properly saturated under stress conditions close to in situ, the specimen was sheared along a constant effective mean stress path mimicking the stress path followed during gallery excavation. The shear stress was afterwards released and an undrained heating test was performed on the sheared specimen. It was observed that the temperature increase under undrained conditions led to a thermal increase in pore water pressure resulting in a decrease in mean effective stress that brought back the sheared specimen to failure, evidencing a thermally induced failure. Steady state radial permeability tests performed at various stages of the test demonstrated that the overall permeability of the sheared specimen was comparable to that before shearing, confirming the excellent self-sealing properties of the Callovo-Oxfordian claystone. This shows that, in spite of being possibly remobilised by temperature elevation, the EDZ will keep an overall permeability constant equal to that of the massive rock, keeping the same isolation properties

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Section: Discussionsupporting

confidence: 85%

On the Thermo-Hydro-Mechanical Behaviour of a Sheared Callovo-Oxfordian Claystone Sample with Respect to the EDZ Behaviour

et al. 2015

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“…To verify the adequacy of the model, some triaxial testes have been modelled hereafter. The tests are conducted on a clay stone from the East region of France called "Argilites de l"Est" (Homand et al 2002;Chiarelli and Shao, 2002;Chiarelli 2000). The specimens were 40 mm in height and 20 mm in radius and the tests were carried out under isothermal and drained conditions.…”

Section: Triaxial Mechanical Testsmentioning

confidence: 99%

An elasto-plastic damage model for argillaceous geomaterials

Alizadeh

Gatmiri

2017

Applied Clay Science

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The aim of this paper is to present a new elastoplastic damage model for unsaturated porous media. The proposed model within the context of poromechanics is intended for constitutive modelling of geomaterials which show two (irreversible) dissipative aspects involving plastic flow and damage. Independent stress state variables, namely net stress and suction, are adopted as stress variables of the model. Barcelona Basic Model is extended to a nonisothermal formulation and is coupled to a damage formulation using damage dependent yield surface and damaged stress variables. The stress state variables are transformed into the damaged state through the definition of effective damaged suction and effective damaged net stress in the framework of Continuum Damage Mechanics (CDM). Damage effects on intrinsic permeability and transfer laws are also taken into consideration. The model has been implemented in Θ-STOCK Code and predictive capabilities of the model have been evaluated against experimental results from the literature. The model is validated by comparing the numerical results with experimental results of argillites and results of an elastodamage model. The proposed model is also shown to give satisfactory simulation results which match the experimental data from a heating test on bentonite samples.

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“…The tests are conducted on a clay stone from the East region of France called 'Argilites de l'Est' [3,26,27]. The specimens were 40 mm in height and 20 mm in radius and the tests were carried out in isothermal state.…”

Section: Numerical Modelling and Verificationmentioning

confidence: 99%

“…[25][26][27]). First, a triaxial lateral extension test was back-analyzed to adjust the preliminary parameters so as to obtain parameters that yielded the best fit to the experimental result.…”

Section: Numerical Modelling and Verificationmentioning

confidence: 99%

Plasto-damage modelling for semi-brittle geomaterials

Alizadeh

Gatmiri

2016

E3S Web Conf.

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Abstract. This paper presents an elastoplastic damage model for constitutive modelling of semi-brittle geomaterials showing two irreversible mechanisms. On one hand, the model deals with the plastic behaviour of a porous medium by a new variant of Barcelona Basic Model. On the other hand, the model combines the micromechanical definition of damage and phenomenological concepts in the framework of Continuum Damage Mechanics (CDM) for damage modelling. A second order tensorial damage variable is adopted for the model. Damaged effective stress variables are employed for formulation of elastoplastic behaviour laws and the plastic yield surface is a damage dependent one. The model has been validated by comparing the numerical results with experimental results of argillites.

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Caractéristiques physiques et mécaniques du granite de la Vienne et de l’argilite de l’Est

Cited by 7 publications

References 0 publications

On the Thermo-Hydro-Mechanical Behaviour of a Sheared Callovo-Oxfordian Claystone Sample with Respect to the EDZ Behaviour

On the Thermo-Hydro-Mechanical Behaviour of a Sheared Callovo-Oxfordian Claystone Sample with Respect to the EDZ Behaviour

An elasto-plastic damage model for argillaceous geomaterials

Plasto-damage modelling for semi-brittle geomaterials

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