DECOVALEX-2019

0537476 - ÚGN 2021 US eng V - Výzkumná zpráva
Gens, A. - Alcoverro, J. - Blaheta, Radim - Hasal, Martin - Michalec, Zdeněk - Takayama, Y. - Lee, Ch. - Lee, J. - Kim, G. Y. - Kuo, Ch.-W. - Kuo, W.-J. - Lin, C.-Y.
DECOVALEX-2019.
1. - California: The Lawrence Berkeley National Laboratory, 2020. 219 s.
Zdroj financování: N - neveřejné zdroje
Klíčová slova: coupled thermo-hydro-mechanical modeling * bentonite engineered barriers * large scale in situ experiments
Obor OECD: Environmental and geological engineering, geotechnics

The DECOVALEX Project is an on-going international research collaboration, established in 1992, to advance the understanding and modeling of coupled Thermal (T), Hydrological (H), Mechanical (M) and Chemical (C) processes in geological in geological systems. DECOVALEX was initially motivated by the recognition that prediction of these coupled effects is an essential part of the performance and safety assessment of geologic disposal systems for radioactive waste and spent nuclear fuel. Later it was realized that these processes also play a critical role in other subsurface engineering activities, such as subsurface CO2 storage, enhanced geothermal systems, and unconventional oil and gas production through hydraulic fracturing. Research teams from many countries (e.g., Canada, China, Czech Republic, Finland, France, Germany, Japan, Republic of Korea, Spain, Sweden, Switzerland, Taiwan, United Kingdom, and the United States) various institutions have participated in the DECOVALEX Project over the years, providing a wide range of perspectives and solutions to these complex problems. These institutions represent radioactive waste management organizations, national research institutes, regulatory agencies, universities, as well as industry and consulting groups.

At the core of the collaborative work with in DECOVALEX is the collaborative analysis and comparative modeling of state-of-the-art field and laboratory experiments. DECOVALEX engages model comparison in a broad and comprehensive sense, including the modelers’ interpretation of experimental data, selection of boundary conditions, rock and fluid properties, etc., in addition to their choice of coupling schemes and simulator. In-depth and detailed discussions among the teams yield insight into the coupled THMC processes and stimulate development of modeling capabilities and measurement methods which would not be possible if the data were studied by only one or two groups.
Since the project initiation, DECOVALEX has been organized in several four-year phases, each phase featuring a number of modeling tasks of importance to radioactive waste disposal and other geoscience applications. Six project phases were successfully concluded between 1992 and 2015, results of which have been summarized in several overview publications (e.g., Tsang et al., 2009, Birkholzer et al., 2018, Birkholzer et al., 2019). The most recent phase, named DECOVALEX-2019, started in 2016 and ended in 2019. Seven tasks were conducted in DECOVALEX-2019, as follows:

• Task A: ENGINEER - Advective gas flow through low permeability materials
• Task B: Fault Slip Test - Fault slip processes in argillaceous rock
• Task C: GREET - Hydro-mechanical-chemical processes during groundwater recovery
• Task D: INBEB - HM and THM interactions in bentonite engineered barriers
• Task E: Upscaling Heater Tests - Upscaling of heater test results to repository scale
• Task F: FINITO - Fluid inclusions and movement in tight rock
• Task G: EDZ Evolution - EDZ evolution and permeability changes in crystalline rock

This document is the final report of Task D which was proposed by the DECOVALEX Project and coordinated by CIMNE_UPC, presenting the technical definitions of the problems studied, approaches applied, achievements made and outstanding issues for future research.
Trvalý link: http://hdl.handle.net/11104/0315268