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  • 1
    Keywords: Foundations. ; Hydraulics. ; Earth sciences. ; Engineering geology. ; Engineering—Geology. ; Geotechnical engineering. ; Geology. ; Gesteinsmechanik ; Fluid-Fels-System ; Porosität ; Permeabilität ; Bruchmechanik ; Fluid-Fels-System ; Festgestein ; Bruchmechanik ; Klüftung ; Spannung ; Numerisches Modell ; Bruch ; Endlager ; Hochradioaktiver Abfall ; Gestein ; Rissbildung ; Mathematisches Modell ; Modellierung ; Grundgebirge ; Rissbildung ; Rissverhalten ; Deformation ; Mechanische Beanspruchung ; Modellversuch ; Geomechanik ; Geomechanische Eigenschaft ; Kristallin ; Kristallines Gestein ; Salzgestein ; Salzmechanik ; Ton ; Tonstein ; Unterirdische Lagerung ; Stabilität ; Unterirdisches Bauwerk ; Radioaktiver Abfall ; Barriere ; Riss ; Rissausbreitung
    Description / Table of Contents: 1. Introduction to GeomInt -- 2. Experimental Platform -- 3. Numerical Platform -- 4.Model-Experiment-Exercises (MEX) -- 5. Data Management -- 6. Synthesis and Outlook -- 7. Code Descriptions.
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource(XVI, 277 p. 216 illus., 176 illus. in color.)
    Edition: 1st ed. 2021.
    ISBN: 9783030619091
    Series Statement: Terrestrial Environmental Sciences
    Language: English
    Note: Open Access
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  • 2
    Online Resource
    Online Resource
    Cham : Springer International Publishing AG
    Keywords: Electronic books
    Description / Table of Contents: Intro -- Acknowledgements -- About this book -- Hintergrund -- Das GeomInt-Projekt -- Der GeomInt-Ansatz: lab, in-situ, in-silico, virtual reality -- Contents -- Contributors -- 1 Introduction to GeomInt -- 1.1 Background -- 1.2 The GeomInt Project -- 1.3 GeomInt Approach: Lab, In-situ, In-silico, Virtual Reality -- 1.4 GeomInt Team -- 1.4.1 BGR -- 1.4.2 CAU -- 1.4.3 IfG -- 1.4.4 TUBAF -- 1.4.5 UFZ -- 1.4.6 UoS -- Reference -- 2 Experimental Platform -- 2.1 Rock Material Properties -- 2.1.1 Opalinus Clay from Mont Terri, Switzerland -- 2.1.2 Rock Salt Samples -- 2.1.3 Crystalline Rock Samples -- 2.2 Thermo-Hydro-Mechanical Laboratory Tests -- 2.2.1 X-ray Micro Computed Tomography -- 2.2.2 Fracture Toughness of the Opalinus Clay -- 2.2.3 Brazilian Disk Test on Barrier Rocks -- 2.2.4 True Triaxial Test on the Cubic Opalinus Clay Samples -- 2.2.5 Triaxial Compression Strength Tests for Salt-Methodology and Equipment -- 2.3 Shrinkage and Swelling Laboratory Tests (WP1) -- 2.3.1 The Swelling and Permeability of T4 Salt Clay -- 2.3.2 The Wetting and Drying Paths of the Opalinus Clay -- 2.3.3 In-situ Condition Desiccation Process -- 2.4 Pressure Driven Percolation Laboratory Tests (WP2) -- 2.4.1 Pressure Driven Percolation -- 2.4.2 Fluid Driven Percolation Tests on Cubic Opalinus Claystone Samples from Mont Terri -- 2.5 Stress Redistribution Laboratory Tests (WP3) -- 2.5.1 Direct Shear Test -- 2.5.2 Cyclic Loading Pressure Diffusion -- References -- 3 Numerical Platform -- 3.1 State-of-the-Art -- 3.1.1 THM Simulations and Open Source Development -- 3.1.2 Continuum Models (XFEM and Variational Phase Field) -- 3.1.3 Discontinuum Models -- 3.1.4 Smoothed Particle Hydrodynamics -- 3.2 Numerical Methods -- 3.2.1 FFS-Forces on Fracture Surfaces -- 3.2.2 LEM-Lattice-Element-Method -- 3.2.3 DEM-Distinct-Element-Method.
    Type of Medium: Online Resource
    Pages: 1 online resource (287 pages)
    ISBN: 9783030619091
    Series Statement: Terrestrial Environmental Sciences Ser.
    Language: English
    Note: Description based on publisher supplied metadata and other sources
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  • 3
    Publication Date: 2023-09-14
    Description: 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).
    Description: BMBF
    Description: Helmholtz-Zentrum für Umweltforschung GmbH - UFZ (4215)
    Keywords: ddc:550.724 ; GeomInt ; Fracture flow ; Fracture mechanics ; Barrier integrity ; Discontinuities ; Open source ; OpenGeoSys
    Language: English
    Type: doc-type:article
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 8753-8761 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: When a gas phase atom or molecule hits a nonrigid surface, both elastic and inelastic scattering and sticking can occur. We suggest treating the dynamics of these processes using open-system density matrix theory. For the "free→free" and "free→bound" events at hand, both fundamental and numerical problems arise. The fundamental problem is that the adsorbate "system" is anharmonic and the coupling between the system and the substrate "bath" has to be nonlinear at least in the system coordinates. Here we propose a new Lindblad-type open-system density matrix approach which accounts for system anharmonicity and nonlinearity of the system–bath coupling. The numerical problem is that for a dissipative scattering process large basis sets or grids are required, making the storage and direct propagation of a density matrix difficult. To overcome this problem we use a mapped Fourier method which reduces the grid size and hence the storage requirements significantly. We apply the new methods and techniques to a simple model resembling the simultaneous scattering and sticking of an O2 molecule at a metal surface. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 7189-7199 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The femtosecond laser pulse induced desorption of a molecule (NO) from a metal surface (Pt) is investigated by means of open-system density matrix theory. Single- and two-pulse scenarios in the so-called DIMET limit (Desorption Induced by Multiple Electronic Transitions) are considered. Special emphasis is given (a) to a realistic modeling of the temperature profiles of substrate degrees of freedom in response to a laser pulse, (b) to the role of vibrational relaxation of the adsorbate-surface bond, and (c) to a critical comparison of our anharmonic "excitation–deexcitation" approach to the simpler Truncated Harmonic Oscillator model with electronic friction. For the single-pulse case, nonlinear scaling of the desorption yield with laser fluence is demonstrated and found to be in good agreement with experiment. For the two-pulse case, time-resolved correlation diagrams are calculated and interpreted. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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