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Title of Journal: Hydrogeol J

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Abbravation: Hydrogeology Journal

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Springer-Verlag

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DOI

10.1002/er.4440050110

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1435-0157

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Numerical modeling of stresspermeability coupling

Authors: Robert Walsh Chris McDermott Olaf Kolditz
Publish Date: 2008/03/13
Volume: 16, Issue: 4, Pages: 613-
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Abstract

A numerical model is described for coupled flow and mechanical deformation in fractured rock The mechanical response of rock joints to changes in hydraulic pressure is strongly influenced by the geometric characteristics of the joint surfaces The concept of this work is to combine straightforward finite element solutions with complex and realistic fracture surface geometry in order to reproduce the nonlinear stressdeformationpermeability coupling that is commonly observed in fractures Building on the numerous studies that have expanded the understanding of the key parameters needed to describe natural roughwalled fractures new methods have been developed to generate a finite element mesh representing discrete fractures with realistic rough surface geometries embedded in a rock matrix The finite element code GeoSys/Rockflow was then used to simulate the coupled effects of hydraulic stress mechanical stress and surface geometry on the evolving permeability of a single discrete fracture The modeling concept was experimentally verified against examples from the literature Modeling results were also compared to a simple interpenetration modelUn modèle numérique est utilisé pour étudier la déformation mécanique et l’écoulement couplé dans les roches fracturées La réponse mécanique des joints dans la roche aux changements de la pression hydraulique est fortement influencée par les caractéristiques géométriques des surfaces du joint en question Le concept derrière ce travail est la combinaison directe des solutions aux éléments finis avec des géométries de surface de fracture complexes et réalistes de façon a reproduire le couple non linéaire tension déformation perméabilité qui est habituellement observé dans les fractures Construites sur de nombreuses études qui ont étendu la compréhension des paramètres clés nécessaires à la description des fractures naturellement rugueuses de nouvelles méthodes ont été développées pour générer un maillage aux éléments finis représentant des fractures discrètes avec des géométries de surface a la rugosité réaliste et parfaitement incluses dans la matrice rocheuse Le code pour les éléments finis GeoSys/Rockflow a été utilisé pour simuler les effets couplés des tensions hydrauliques tensions mécaniques et la géométrie de la surface d’une perméabilité variable d’une simple fracture discrète Le concept de la modélisation a été expérimentalement vérifié avec des exemples tires de la littérature Les résultats de la modélisation ont été également comparées à un simple modèle d’interpénétrationSe describe un modelo numérico para flujo acoplado y deformación mecánica en roca fracturada La respuesta mecánica de las grietas de las rocas a cambios en presión hidráulica está fuertemente influenciada por las características geométricas de las grietas superficiales El concepto de este trabajo es combinar soluciones directas de elemento finito con la geometría superficial de fracturas complejas y realísticas para reproducir el acoplamiento no linear de permeabilidaddeformaciónstress que frecuentemente se observa en fracturas Apoyándose en los estudios numerosos que han incrementado el conocimiento de los parámetros clave necesarios para describir fracturas naturales de paredes rugosas se han desarrollado nuevos métodos para generar una malla de elemento finito que representa fracturas discretas con geometrías superficiales rugosas realísticas inmersas en una matriz rocosa Luego se utilizó el código de elemento finito GeoSys/Rockflow para simular los efectos acoplados de stress hidráulico stress mecánico y geometría superficial en la permeabilidad cambiante de una sola fractura discreta Se verificó el modelo conceptual en contra de ejemplos de la literatura Los resultados del modelo también se compararon con un modelo simple de interpenetraciónThe authors wish to thank the German Science Foundation Deutsche Forschungsgemeinschaft DFG for funding through Grant MC113/1–5 and KO 1591/2–4 and the Federal Institute for Geosciences and Natural Resources Bundesanstalt fuer Geowissenschaften und Rohstoffe BGR under grant 2014500023879 DECOVALEX project


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