000233645 001__ 233645
000233645 005__ 20190604054649.0
000233645 022__ $$a0723-2632
000233645 0247_ $$2doi$$a10.1007/s00603-017-1398-5
000233645 037__ $$aARTICLE
000233645 245__ $$aAnisotropic behaviour of Opalinus Clay through consolidated and drained triaxial testing in saturated conditions
000233645 260__ $$c2018
000233645 269__ $$a2018
000233645 336__ $$aJournal Articles
000233645 520__ $$aThis paper investigates the anisotropic hydro-mechanical behaviour of Opalinus Clay shale, the host material currently being considered for the construction of a nuclear waste repository in Switzerland. Consolidated and drained triaxial tests on Opalinus Clay from the Mont Terri URL have been conducted in order to derive information on its strength and stiffness properties. Opalinus Clay specimens were tested both parallel to bedding (P-specimens) and perpendicular to bedding (S7 specimens). The considered effective confining stress range (from 2 to 12 MPa) has been selected in order to reproduce possible in-situ stress conditions for the repository. In this work, particular attention has been paid to the experimental procedure in order to ensure consolidated conditions and avoid generation of unwanted excess pore water pressure during drained shearing. The Skempton B parameter has been determined for all the tested specimens in order to ensure saturation. Both single-stage and multistage triaxial testing procedures were adopted in the experimental campaign. The results of the triaxial tests highlight an anisotropic elastic response of Opalinus Clay: S specimens present a more compliant behavior than P-specimens. The values of the Young modulus are found to increase with the increase in mean effective stress. The analysis of the peak and ultimate shear strength results reveals that the material behaves in a similar manner regardless of the considered direction of loading (P and S directions) with respect to the bedding orientation. Peak and ultimate failure envelopes for Opalinus Clay were derived for the investigated stress range.
000233645 6531_ $$aShales
000233645 6531_ $$aOpalinus Clay
000233645 6531_ $$aTriaxial testing
000233645 6531_ $$aAnisotropy
000233645 6531_ $$aNuclear waste disposal
000233645 700__ $$g225480$$aFavero, Valentina$$0246383
000233645 700__ $$g178175$$aFerrari, Alessio$$0242683
000233645 700__ $$g105611$$aLaloui, Lyesse$$0240226
000233645 773__ $$q1305-1319$$k5$$j51$$tRock Mechanics and Rock Engineering
000233645 8560_ $$falain.borel@epfl.ch
000233645 909C0 $$xU10264$$0252080$$pLMS
000233645 909CO $$particle$$pENAC$$ooai:infoscience.tind.io:233645
000233645 917Z8 $$x105611
000233645 937__ $$aEPFL-ARTICLE-233645
000233645 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000233645 980__ $$aARTICLE