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http://dx.doi.org/10.7474/TUS.2022.32.6.518

A Thermo-Hydro-Mechanical Coupled Numerical Simulation on the FE Experiment: Step 1 Simulation in Task C of DECOVALEX-2023  

Taehyun, Kim (Korea Atomic Energy Research Institute (KAERI))
Chan-Hee, Park (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Changsoo, Lee (Korea Atomic Energy Research Institute (KAERI))
Jin-Seop, Kim (Korea Atomic Energy Research Institute (KAERI))
Publication Information
Tunnel and Underground Space / v.32, no.6, 2022 , pp. 518-529 More about this Journal
Abstract
In Task C of the DECOVALEX-2023 project, nine institutes from six nations are developing their numerical codes to simulate thermo-hydro-mechanical coupled behavior for the FE experiment performed at Mont Terri underground rock laboratory, Switzerland. Currently, Step 1 for comparing the simulation results to field data is the ongoing stage, and we used the OGS-FLAC simulator for a series of numerical simulations. As a result, temperature increase depending on the heating hysteresis was well simulated, and saturation variation in the bentonite depending on phase change was observed. However, due to the suction overestimation, relative humidity and temperature change in the bentonite and the pressure variation in the Opalinus clay showed a difference compared to the field data. From the observation, it is confirmed that the effect of the bentonite capillary pressure is dominant to the flow analysis in the disposal system. We further plan to draw improved results considering tunnel support material and accurate initial water pressure distribution. Additionally, the thermal, hydrological, and mechanical anisotropy of the Opalinus clay was well simulated. From the simulation results, we confirmed the applicability of the OGS-FLAC simulator in the disposal system analysis.
Keywords
DECOVALEX-2023 Task C; OGS-FLAC; Multi-phase flow; Thermo-Hydro-Mechanical coupled behavior;
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Times Cited By KSCI : 6  (Citation Analysis)
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