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GeomInt: geomechanical integrity of host and barrier rocks–experiments, models and analysis of discontinuities (2021)

Kolditz, Olaf ; Fischer, Thomas ; Frühwirt, Thomas ; [weitere]

Springer Berlin Heidelberg

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Publikationsdatum: 2023-09-14

Beschreibung: The present paper gives an overview of the GeomInt project “Geomechanical integrity of host and barrier rocks—experiment, modelling and analysis of discontinuities” which has been conducted from 2017–2020 within the framework of the “Geo:N Geosciences for Sustainability” program. The research concept of the collaborative project is briefly introduced followed by a summary of the most important outcomes. The research concept puts geological discontinuities into the centre of investigations—as these belong to the most interesting and critical elements for any subsurface utilisation. Thus, while research questions are specific, they bear relevance to a wide range of applications. The specific research is thus integrated into a generic concept in order to make the results more generally applicable and transferable. The generic part includes a variety of conceptual approaches and their numerical realisations for describing the evolution of discontinuities in the most important types of barrier rocks. An explicit validation concept for the generic framework was developed and realised by specific “model-experiment-exercises” (MEX) which combined experiments and models in a systematic way from the very beginning. 16 MEX have been developed which cover a wide range of fundamental fracturing mechanisms, i.e. swelling/shrinkage, fluid percolation, and stress redistribution processes. The progress in model development is also demonstrated by field-scale applications, e.g. in the analysis and design of experiments in underground research laboratories in Opalinus Clay (URL Mont Terri, Switzerland) and salt rock (research mine Springen, Germany).

Beschreibung: BMBF

Beschreibung: Helmholtz-Zentrum für Umweltforschung GmbH - UFZ (4215)

Schlagwort(e): ddc:550.724 ; GeomInt ; Fracture flow ; Fracture mechanics ; Barrier integrity ; Discontinuities ; Open source ; OpenGeoSys

Sprache: Englisch

Materialart: doc-type:article

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Simulation of direct shear tests using a forces on fracture surfaces (FFS) approach (2021)

Frühwirt, Thomas ; Pötschke, Daniel ; Konietzky, Heinz ; [weitere]

Springer Berlin Heidelberg

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Publikationsdatum: 2023-11-13

Beschreibung: The aim of this work is to provide a complete data set of direct shear tests and to propose a corresponding simulation approach. Tests have been conducted on crystalline rock samples applying constant normal load (CNL) and constant normal stiffness (CNS) boundary conditions. A physical consistent algorithm which explicitly calculates the forces acting on the fracture surface (FFS) has been developed. This FFS approach can explain the occurrence of surface degradation and shows the main shear characteristics. After all, shearing of rough rock joints remains a complex process and the differences between laboratory and simulation results are still significant in some cases. All data and input files are provided free for download and testing.

Beschreibung: Bundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347

Beschreibung: Technische Universität Bergakademie Freiberg (3135)

Beschreibung: http://www.ufz.de/record/dmp/archive/7925

Beschreibung: http://www.ufz.de/record/dmp/archive/7924

Beschreibung: https://github.com/Poetschke/Ecodist

Schlagwort(e): ddc:550.78 ; GeomInt project ; Direct shear test ; Rock surface scanning ; Rock joint ; Joint constitutive model