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en1, P. Bésu echnology, S Grenoble Alp 3_{CNRS, 3SR} Co dept, Uni cal repositor y of the host coupling betw tudy of radio elling hydro-ck for reposi FE2_{) using a} micro-scale. stitutive law f DZ) around t nical continuu are solved u ucture of the thereby allo allowing fluid id parts, this mework of co into accoun e-scale mod with a poro-m cture with po active Waste M 36

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ambon2, J. De ng, Delft, Ne e, France  ce Belgium adioactive w ty is influenc chanical beh es. In this con ehaviour of esented appr ary volume (R of this RE e used in the coupled hydro method, re contains el g with deform y the variatio mechanical s ation [4,2]. T of a granu al coupling at the macr croscale [2]. al Disposal

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esrues2 etherlands waste relies a ced by mech haviour of the ntext an app Callovo-Oxfo roach is a do REV) to mod EV serves e modelling o-mechanica egularized u lastic deform mation. Add on in interfa system at the This techniqu ular microstr in the frame roscale and .

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2 Modelling a The double excavation gallery wall correspond characterist time-depend The micros embedded microstructu the full-field permeability Results The presen excavation situ measur permeability capturing th The influen shows an e strain locali the anisotro a) Figure Conclusion The newly d project. Qu method is a tool for deriv model is ab evolution of Acknowled The support acknowledg References [1] F. Collin geotechn in Engin 2nd _Petrus-OPE approach to scale appro damaged zo l in the num to the in-tic for the Un dent respons tructure in t in the clay ural experim d, macrosco y. nted results takes place rements with y is made. T he behaviour ce of the m example of d zation. The opy introduce e 2: a) The in excavatio n developed do alitative com able to captu ving complex ble to make p f anisotropy i dgments t of the Fren ged. s , R. Chambo nical problem eering, 65 (1 ERA Conferen o the benchm oach was ap one around merical mod -situ conditio nderground se to this unl he REV is u matrix. Micro ental results opic distribut cover the in the nume h respect to This compar r of the excav icrostructure displacemen specific patt ed by the mic b) nitial micros on. c) The p ouble-scale m mparison wit ure different x material re predictions fo n strength, s ch nuclear w on,R. Charlie ms using loca 11), 1749–17 nce on Radioa mark exerci plied on the [5]. Modellin el over a p ons during Research La oading is mo used to mod ostructure ge and laborat tion of fluid first 1,5 yea erical simulat gallery conv rison is used vation damag e is studied nts and pore tern of active crostructure. structure. b) ore pressur model prove h in-situ me aspects of t esponse from or both defor stiffness and waste manag er, 2006. “A f al second gra 772. active Waste M 37 ise modelling o ng the excav period of 28 excavation aboratory (U odelled for a del the beha

eometries a tory tests. Th pressures, ars of excav tion. A comp vergence, po d to evaluat ged zone aro in term of o e pressures e strain loca ) The Von-M re distributio es applicable easurements the hydro-me m micromech rmations and hydraulic co gement agen finite elemen adient mode Management a of a modellin vation proces days. The of a galle RL) in Bure period of 10 aviour of the nd constituti he double-sc deformation vation, durin parative stud ore pressure te the capab ound gallerie onset and pa to excavatio alization band c) Mises equiva on 1,5 years in engineeri s of gallery c echanical be hanical behav d pore press onductivity. cy (ANDRA) t method for ls” Internatio and Geologica g benchmark ss in 2D by boundary c ry in Callov , Marne/Hau 00 years. claystone a ve behaviou cale modellin ns and mate ng which m dy between m e response a bilities of the es during and attern of stra on, demonstr ds is demon alent strain r s after excav ng problems convergence haviour of c viour with a r sure distribut to this resea poro mecha onal Journal f al Disposal rk exercise re means of u conditions fo vo-Oxfordian ute-Meuse, F at the level o ur are calibra ng is then use erial propert most of the modelling res and the enha e double-sca d after excav ain localisatio rating the d nstrated to b rate 1,5 yea vation [3]. s such as the e demonstra claystone and reduced com tions, taking arch is grate anical modell for Numerica elated to the nloading the or unloading n claystone, France. The of inclusions ated against ed to predict ies such as response to sults and in-ancement of ale model in vation. on. Figure 2 istribution of be related to rs after e benchmark ates that the d provides a mplexity. The into account fully ing of al Methods e e g , e s t t s o -f n 2 f o k e a e t

2nd _{Petrus-OPERA Conference on Radioactive Waste Management and Geological Disposal}

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[2] A.P. van den Eijnden, “Multiscale modelling of the hydromechanical behaviour of argillaceous rocks”, PhD

Thesis, Université Grenoble Alpes, France, 2015.

[3] A.P. van den Eijnden, P. Bésuelle, F. Collin, J. Desrues, “Modeling the strain localization around an underground gallery with a hydro-mechanical double scale model; effect of anisotropy”, under review [4] V. Kouznetsova, W.A.M. Brekelmans, F.P.T. Baaijens, 2001. “An approach to micro-macro modeling of

heterogeneous materials”. Computational Mechanics 27 (1), 37–48.

[5] D. Seyedi, G. Armand, A. Noiret, 2016. “’Transverse action’ - a model benchmark exercise for numerical analysis of the Callovo-Oxfordian clay-stone hydromechanical response to excavation operations”, under