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http://dx.doi.org/10.7474/TUS.2021.31.6.610

A Numerical Study on the Step 0 Benchmark Test in Task C of DECOVALEX-2023: Simulation for Thermo-Hydro-Mechanical Coupled Behavior by Using OGS-FLAC  

Kim, Taehyun (Korea Atomic Energy Research Institute (KAERI))
Park, Chan-Hee (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Lee, Changsoo (Korea Atomic Energy Research Institute (KAERI))
Kim, Jin-Seop (Korea Atomic Energy Research Institute (KAERI))
Publication Information
Tunnel and Underground Space / v.31, no.6, 2021 , pp. 610-622 More about this Journal
Abstract
The DECOVALEX project is one of the representative international cooperative projects to enhance the understanding of the complex Thermo-Hydro-Mechanical-Chemical(THMC) coupled behavior in the high-level radioactive waste disposal system based on the numerical simulation. DECOVALEX-2023 is the current phase consisting of 7 tasks, and Task C aims to model the THM coupled behavior in the disposal system based on the Full-scale Emplacement (FE) experiment at the Mont-Terri underground rock laboratory. This study performs the numerical simulation based on the OGS-FLAC developed for the current study. In the numerical model, we emplaced the heater with constant power horizontally based on the FE experiment and monitored the pressure development, temperature increase, and mechanical deformation at the specific monitoring points. We monitored the capillary pressure as the primary effect inducing the flow in the buffer system, and thermal stress and pressurization were dominant in the surrounding rocks' area. The results will also be compared and validated with the other participating groups and the experimental data further.
Keywords
DECOVALEX-2023; FE experiment; OGS-FLAC; Thermo-Hydro-Mechanical coupled behavior;
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1 van Genuchten, M.T., 1980, A Closed-form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils, Soil Science Society of America Journal, 44(5), 892-898.   DOI
2 Beaucaire, C., E. Tertre, E. Ferrage, B. Grenut, S. Pronier and B. Made, 2012, A thermodynamic model for the prediction of pore water composition of clayey rock at 25 and 80℃ comparison with results from hydrothermal alteration experiments, Chemical Geology, 334, 62-76.   DOI
3 Alonso, E.E., J. Alcoverro, et al. and P. Jussila, 2005, The FEBEX benchmark test: case definition and comparison of modelling approaches, International Journal of Rock Mechanics and Mining Sciences, 42, 611-638.   DOI
4 ENRESA, 2000, FEBEX project. Full-scale Engineered Barriers Experiment for a Deep Geological Repository for High Level Radioactive Waste in Crystalline Host Rock. Madrid: Final report.
5 Kim, T., C. Lee, J.-W. Kim, S. Kang, S. Kwon, K.-I. Kim, J.-W. Park, C.-H. Park and J.-S. Kim, 2021a, Introduction to Tasks in the International Cooperation Project, DECOVALEX-2023 for the Simulation of Coupled Thermohydro-mechanical-chemical Behavior in a Deep Geological Disposal of High-level Radioactive Waste, Tunnel and Underground Space, 31(3), 167-183.   DOI
6 Graupner, B. and K. Thatcher, 2020, Task C THM modelling of the FE experiment (Presentation material), DECOVALEX-2023 1st workshop.
7 Lee, C., H.-J. Choi, G.-Y. Kim, 2020a, Numerical modelling of coupled thermo-hydro-mechanical behavior of Heater Experiment-D (HE-D) at Mont Terri rock laboratory in Switzerland, Tunnel and Underground Space, 30(3), 242-255.   DOI
8 Park, C.-H., T. Kim, E.-S. Park, Y.-B. Jung and E.-S. Bang, 2019, Development and Verification of OGSFLAC Simulator for Hydro-mechanical Coupled Analysis: Single-phase Fluid Flow Analysis, Tunnel and Underground Space, 29(6), 468-479.   DOI
9 Yoon, S., J.-S. Jeon, C. Lee, W.-J. Cho, S.-R. Lee and G.-Y. Kim, 2019, Devaluation of Soil-Water Characteristic Curve for Domestic Bentonite Buffer, Journal of Nuclear Fuel Cycle and Waste Technology, 17(1), 29-36.   DOI
10 Birkholzer, J.T., C.-F. Tsang, A.E. Bond, J.A. Hudson, L. Jing and O. Stephansson, 2019, 25 years of DECOVALEX- Scientific advances and lessons learned from an international research collaboration in coupled subsurface processes, International Journal of Rock Mechanics and Mining Sciences, 122, 103995.   DOI
11 Itasca, 2013, FLAC3D (version 5.0) Online manual.
12 Kim, T., C.-H. Park, N. Watanabe, E.-S. Park, J.-W. Park, Y.-B. Jung, O. Kolditz, 2021b, Numerical modeling of two-phase flow in deformable porous media: application to CO2 injection analysis in the Otway Basin, Australia, Environmental Earth Sciences, 80(121), 1-15.   DOI
13 Rink, K., 2015, The OpenGeoSys data explorer manual Rutqvist, J., L. Borgesson, et al. and C.-F. Tsang, 2001, Coupled thermo-hydro-mechanical analysis of a heater test in fractured rock and bentonite at Kamaishi Mine - comparison of field results to predictions of four finite element codes, International Journal of Rock Mechanics and Mining Sciences, 38, 129-142.   DOI
14 Kwon, S., W.-J. Cho and J.-W. Choi, 2007, Status of the international cooperation project, DECOVALEX for THM coupling analysis, Journal of the Korean Radioactive Waste Society, 5(4), 323-338.
15 Lee, C., T. Kim, J. Lee, J.-W. Park, S. Kwon and J.-S Kim, 2020b, Introduction of International Cooperation Project, DECOVALEX from 2008 to 2019, Tunnel and Underground Space, 30(4), 271-305.   DOI
16 Nagra, 2019, Implementation of the Full-scale Emplacement experiment at Mont Terri: Design, construction and preliminary results, Technical report 15-02, National Cooperative for the Disposal of Radioactive Waste, 202p.