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Author Wang, Xuerui ♦ Shao, Hua ♦ Hesser, Jürgen ♦ Kolditz, Olaf
Source SpringerLink
Content type Text
Publisher Springer Berlin Heidelberg
File Format PDF
Copyright Year ©2016
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences
Subject Keyword Disposal of radioactive high-level waste ♦ THM coupling ♦ Thermal effects ♦ Clay-based material ♦ OpenGeoSys ♦ Geology ♦ Hydrology/Water Resources ♦ Geochemistry ♦ Environmental Science and Engineering ♦ Terrestrial Pollution ♦ Biogeosciences
Abstract To understand the complex thermo-hydro-mechanical (THM) processes and their evolution in a clay-based engineered barrier systems (EBS) during the closure phase of a geological repository for radioactive waste, a 1:2 scale in situ heating experiment (HE-E experiment) has been ongoing since 2011 in the Mont Terri Rock laboratory. Based on the experimental data, a fully coupled THM 3D simulation using the finite-element program OpenGeoSys was carried out. The main objectives of the simulation were to interpret the experimental observations, to understand the thermally induced THM interactions and to analyse the different material properties. Five experimental phases were numerically interpreted, in order to take into account the changes in the temporary material properties during experimental operations. These included the tunnel excavation, the ventilation, the emplacement of the bentonite EBS, the heating phase and the phase after shutdown of the heater. A non-isothermal Richards’ flow model was used to take into account the evaporation and vapour diffusion during the heating. The material behaviours of EBS in association with the saturation-dependent thermal conductivity and the water retention behaviour under high temperatures were analysed in detail. The strong thermal, hydraulic and mechanical anisotropic properties of the Opalinus Clay were described by a transversely isotropic model.
ISSN 18666280
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2016-10-13
Publisher Place Berlin, Heidelberg
e-ISSN 18666299
Journal Environmental Earth Sciences
Volume Number 75
Issue Number 20
Page Count 21
Starting Page 1
Ending Page 21

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Source: SpringerLink