Geometry and Properties of the Excavation-Induced Fractures at the Meuse/Haute-Marne URL Drifts

Armand, Gilles; Leveau, F.; Nussbaum, Christophe; Vaissière, Rémi de La; Noiret, A.; Jaeggi, David; Landrein, Philippe; Righini, C.

doi:10.1007/s00603-012-0339-6

Cited by 191 publications

(163 citation statements)

References 14 publications

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“…The 555 observed shape is in good agreement with experimental measurements of the shear fracture pattern and extent around the gallery [2]. The extent of the numerical shear banding zone is compared in Table 5 to the in situ measurements of shear and tensile fractures around the gallery [2]. It indicates a satisfactory agreement.…”

Section: Shear Banding Patternsupporting

confidence: 74%

“…To assure a safe repository on the long term, the behaviour of the possible host formations and of the underground structures, where the most hazardous type of wastes will be stored, need to be defined and Many experimental measurements and observations in the considered argillaceous rock have highlighted that damage and fracturing around the galleries play an important role in the hydro-mechanical behaviour of the Excavation aged Zone (EDZ) [1,2]. The latter is a zone that develops around underground galleries due to the drilling process and which is dominated by irreversible hydromechanical property changes.…”

Section: Introductionmentioning

confidence: 99%

“…This approach is chosen because shear banding is usually observed in geomaterials and develops before localised rupture or fractures [4]. Furthermore, the fracturing process in the Callovo-Oxfordian claystone is dominated by shear 40 fractures around the galleries [2]; thus, shear banding can be an adequate manner to represent these fractures [5].…”

mentioning

confidence: 99%

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Modelling the influence of strain localisation and viscosity on the behaviour of underground drifts drilled in claystone

Pardoen

Collin

2017

Computers and Geotechnics

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In the context of the deep geological repository of nuclear wastes, Andra con- Email address: f.collin@ulg.ac.be (F. Collin) 1 FRIA, F.R.S.-FNRS scholarship holder Preprint submitted to Computers and Geotechnics March 18, 2016 to reproduce the EDZ behaviour. Modelling shear banding around the gallery is an important aspect that leads to a better description of the EDZ for the considered claystone. Moreover, considering the material viscosity allows a better reproduction of the gallery convergence in the long term.

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Section: Shear Banding Patternsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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Modelling the influence of strain localisation and viscosity on the behaviour of underground drifts drilled in claystone

Pardoen

Collin

2017

Computers and Geotechnics

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“…In situ fractures and permeability in Callovo-Oxfordian claystone (Armand et al 2014) The total stress field is defined according to Bishop's postulate, corresponding to Biot's definition and taking into account partial saturation:…”

Section: Coupled Local Second Gradient Modelmentioning

confidence: 99%

Using Shear Strain Localisation to Model the Fracturing Around Gallery in Unsaturated Callovo-Oxfordian Claystone

Pardoen

Levasseur

Collin

2014

Springer Series in Geomechanics and Geoengineering

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Galleries drilling leads to damage propagation, fracturing and properties modifications in the surrounding medium. The prediction of the damaged zone behaviour is an important matter and needs to be properly assessed. To do so the fractures can be modelled using shear strain localisation. The coupled local second gradient model is used under unsaturated conditions to correctly model the strain localisation behaviour. The permeability evolution and the rock desaturation due to air ventilation in galleries are considered. Finally, a hydro-mechanical modelling of a gallery excavation in Callovo-Oxfordian claystone is performed leading to a fairly good representation of the damaged zone.

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“…At the main level of the Meuse/Haute-Marne URL, Armand et al [4] show that excavation works induce an important fracture pattern (shear an extension fractures) whose extent depends on the drift orientation versus the in situ principal stresses. The effect of relative humidity change on the behavior of the excavation induced fractures network is key point of SDZ experiment.…”

Section: Introductionmentioning

confidence: 99%

Inputs from in situ experiments to the understanding of the unsaturated behaviour of Callovo-Oxfordian claystone

Armand¹,

Djizanne²,

Zghondi³

et al. 2016

E3S Web Conf.

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Abstract. The French national radioactive waste management agency (Andra) research program is dedicated to preparing the construction and operation of a deep geological disposal facility for high-level and intermediate-level long-lived radioactive waste (HL, IL-LLW) in the Callovo-Oxfordian claystone (COx). The characterization of the COx thermo-hydro-mechanical (THM) behavior, at different scales of interest, must gradually give relevant data for design and safety calculations. The effects of saturation and desaturation of COx claystone are studied in laboratory conditions (sample scale) and in situ (drift scale), in order to improve knowledge on ventilation effect at gallery wall as galleries will remains open during operational phase (more than 100 years for some specific galleries) in the repository. The Saturation Damaged Zone (SDZ) experiment is outlined and its results are discussed. This experimentation aims to change the relative humidity in an isolated portion of a gallery in order to follow the HM behavior of the surrounding rock mass. Drying and wetting cycles could induce in certain cases cracks and swelling and modify the hydromechanical behavior of the claystone around the gallery (Young modulus, strength, creep…). The long term behavior of the COx claystone at the vicinity of gallery is then studied by performing climatic, hydraulic, geological and geomechanical measurements. Results of the in situ experiment are discussed with respect to the identified process on samples. The discussion given on this paper intends to highlights the inputs from 7 years of an in situ experiment to better understand the unsaturated behavior of the COx claystone.

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Geometry and Properties of the Excavation-Induced Fractures at the Meuse/Haute-Marne URL Drifts

Cited by 191 publications

References 14 publications

Modelling the influence of strain localisation and viscosity on the behaviour of underground drifts drilled in claystone

Modelling the influence of strain localisation and viscosity on the behaviour of underground drifts drilled in claystone

Using Shear Strain Localisation to Model the Fracturing Around Gallery in Unsaturated Callovo-Oxfordian Claystone

Inputs from in situ experiments to the understanding of the unsaturated behaviour of Callovo-Oxfordian claystone

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