NDLI: Coupled HM effects in a crystalline rock mass due to glaciation: indicative results from groundwater flow regimes and stresses from an FEM study

Content Provider	Springer Nature Link
Author	Vidstrand, Patrik Wallroth, Thomas Ericsson, Lars O.
Copyright Year	2008
Abstract	This paper highlights certain aspects of glacial impact on groundwater flow and rock mechanics, of particular interest in future scenarios for the geological disposal of nuclear waste. The investigation took the form of a generic exercise based on conditions at the underground research facility in Whiteshell, Canada. The site scale model domain boundaries were set up based on a number of major deformation zones. The surface boundary conditions comprised a transient ice sheet load and related hydraulic heads, generated by meltwater. It has thus been possible to compare glacial impact in relation to present-day climatological conditions. The main issues in the investigation were to evaluate the groundwater flow regime and the pre-requisites for underground jacking as well as shearing according to the prescribed geoscientific properties of a benchmark protocol. Special attention has been devoted to a solution to the hydromechanical (HM) problem (1) with or without process coupling, (2) with or without a transient approach, and (3) considering a two- or three-dimensional mode. The study underlines the need for transient analyses in 3D of these coupled phenomena.L’article met en lumière certains aspects d’un impact glaciaire sur l’écoulement des eaux souterraines et le comportement mécanique des roches, avec un intérêt particulier pour l’étude de scénarios relatifs au stockage de déchets radioactifs en formations géologiques. La recherche a pris la forme d’un exercice générique basé sur les conditions du laboratoire souterrain de Whiteshell, au Canada. Les conditions aux limites du modèle ont pris en compte les différentes zones de déformation majeure du site. Les conditions aux limites de surface considèrent le chargement transitoire d’une calotte glaciaire et les charges hydrauliques correspondantes, générées par les eaux de fonte. Ainsi, il a été possible de comparer l’impact glaciaire avec les conditions climatiques actuelles. Les principaux thèmes de la recherche portaient sur l’évaluation du régime des eaux souterraines et les facteurs de prédisposition au claquage hydraulique et au cisaillement, suivant les propriétés géotechniques fournies par un protocole d’exercice normalisé. Une attention particulière a été portée sur une solution au problème hydromécanique (HM) (i) avec ou sans couplage des processus, (ii) avec ou sans approche transitoire et (iii) considérant une analyse à deux ou trois dimensions. L’étude souligne la nécessité de réaliser des analyses en mode transitoire, à trois dimensions, pour ces phénomènes couplés.
Starting Page	187
Ending Page	197
Page Count	11
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	67
Issue Number	2
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-03-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Stockage géologique Déchets nucléaires Impact glaciaire Protocole d’exercice normalisé Régime des eaux souterraines Phénomènes hydromécaniques couplés Nature Conservation Geoecology/Natural Processes Structural Foundations, Hydraulic Engineering Applied Geosciences
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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Coupled HM effects in a crystalline rock mass due to glaciation: indicative results from groundwater flow regimes and stresses from an FEM study