This is an open access book. In view of growing conflicts over strategic georesources, the use of the geological subsurface in the sense of a regional resource is becoming increasingly important. In this context, georeservoirs are playing an important role for the energy transition not only as a source of energy but also as a storage facility and deep geological disposal for energy waste. The success of the energy transition also depends to a large extent on the efficient and safe use of underground resources.
This book complements the previous basic book (GeomInt―Integrity of Host Rocks) with a series of application examples in different rock formations, clay, salt, and crystalline. The methodology developed in GeomInt is used, among others, in the Mont Terri underground research laboratory (Opalinus Clay), in the large borehole test in Springen (salt rock) and in the “Reiche Zeche” teaching and research mine (crystalline rock). In addition, new methodological developments are also taken up in experiments and models and embedded in workflows for geotechnical system analyses.
The present book summarizes the results of the collaborative project “GeomInt2: Geomechanical integrity of host and barrier rocks - experiment, modeling and analysis of discontinuities” within the program: Geo Research for Sustainability (GEO: N) of the Federal Ministry of Education and Research (BMBF).
Author(s): Olaf Kolditz, Keita Yoshioka, Tuanny Cajuhi, Ralf-Michael Günther, Holger Steeb, Frank Wuttke, Thomas Nagel
Series: SpringerBriefs in Earth System Sciences
Publisher: Springer
Year: 2023
Language: English
Pages: 106
City: Cham
Acknowledgements
Contents
Contributors
1 Introduction to GeomInt2
1.1 Project
1.2 Approach
References
2 Hydro-Mechanical Effects and Cracking in Opalinus Clay
2.1 Objectives and Outline
2.2 Observations and Processes in Opalinus Clay
2.3 Monitoring and Data Integration
2.3.1 Laboratory Experiments
2.4 Numerical Modeling Approach
2.4.1 Unsaturated Hydro-Mechanical Approach
2.4.2 Extension with the Phase-Field Approach (Diffuse Cracks)
2.4.3 Extension with the Discrete Element Method (Discrete Cracks)
2.5 Process Simulation Results
2.5.1 Laboratory Scale
2.5.2 Field Scale
2.6 Data Analytics and Visualization
2.7 Summary, Conclusions and Research Transfer
2.7.1 Summary
2.7.2 Conclusions and Research Transfer
References
3 Pathways Through Pressure-Driven Percolation in Salt Rock
3.1 Concept and rock properties
3.2 Mesh-free percolation model
3.2.1 Numerical Challenges in Modeling Highly Anisotropic Permeation
3.2.2 Basic Approach and Formulation
3.3 Model validation
3.3.1 Diffusion of a 1D-Step Function in Different Constant Permeability Fields
3.3.2 The Diffusing Ring Problem
3.3.3 Inclusion of Pressure- and Stress-Dependent Anisotropic Diffusion
3.3.4 Application on a Large-Scale in Situ Borehole Pressurization Test in a Salt Mine
References
4 Pathways and Interfaces Under Stress Redistribution
4.1 Hydro-Mechanics of Deformable High-Aspect Ratio Fractures
4.1.1 Stiffness of Fractures
4.1.2 Strong Versus Weak Coupling
4.2 Lower-Dimensional Representation of Frictional Interfaces
4.3 Verification and Application Examples
4.3.1 Coulomb Model Verification
4.3.2 Soil-Structure Interfaces
4.3.3 Fault Slip Experiment (Mont Terri)
4.4 Concluding Remarks
References
5 Virtual Reality and Computational Efficiency
5.1 Visual Data and Model Integration
5.1.1 Data Integration
5.1.2 Model Integration
5.2 Computational Efficiency
5.3 Software Engineering and Benchmark Workflows
5.3.1 Containers
5.3.2 Benchmarks and Jupyter Notebooks
5.3.3 Benchmark Workflows
References
6 Synthesis and Outlook
6.1 Mechanical Integrity of Clay Rocks
6.1.1 Model Chains
6.1.2 Benchmarking
6.2 International Collaboration
6.2.1 DECOVALEX
6.2.2 EURAD
6.3 Workflows—Mont Terri Project
References
