Evaluation of the predictive capability of coupled thermo-hydro-mechanical models for a heated bentonite/clay system (HE-E) in the Mont Terri Rock Laboratory

Garitte, Benoit; Shao, Hua; Wang, X. R.; Nguyen, Thanh Son; Li, Zhenze; Rutqvist, Jonny; Birkhölzer, Jens; Wang, W. Q.; Kolditz, Olaf; Pan, Peng‐Zhi; Feng, Xia‐Ting; Cs, Lee; Graupner, Bastian; Maekawa, Keisuke; Manepally, C.; Dasgupta, Biswajit; Stothoff, S.; Ofoegbu, Goodluck I.; Fedors, R.; Barnichon, Jean-Dominique

doi:10.1007/s12665-016-6367-x

Cited by 29 publications

(12 citation statements)

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“…The present paper covers the first step of Task B1, modelling of the HE-D experiment. Companion papers Garitte et al 2017) will report on the authors' efforts on the last two steps of Task B1.…”

Section: Resultsmentioning

confidence: 99%

Modelling the Mont Terri HE-D experiment for the Thermal–Hydraulic–Mechanical response of a bedded argillaceous formation to heating

et al. 2017

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Coupled thermal-hydrological-mechanical (THM) processes in the near field of deep geological repositories can influence several safety features of the engineered and geological barriers. Among those features are: the possibility of damage in the host rock, the time for re-saturation of the bentonite, and the perturbations in the hydraulic regime in both the rock and engineered seals. Within the international cooperative code-validation project DECOVALEX-2015, eight research teams developed models to simulate an in situ heater experiment, called HE-D, in Opalinus Clay at the Mont Terri Underground Research Laboratory in Switzerland. The models were developed from the theory of poroelasticity in order to simulate the coupled THM processes that prevailed during the experiment and thereby to characterize the in situ THM properties of Opalinus Clay. The modelling results for the evolution of temperature, pore water pressure, and deformation at different points are consistent among the research teams and compare favourably with the experimental data in terms of trends and absolute values. The models were able to reproduce the main physical processes of the experiment. In particular, most teams simulated temperature and thermally induced pore water pressure well, including spatial variations caused by inherent anisotropy due to bedding.

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Section: Resultsmentioning

confidence: 99%

Modelling the Mont Terri HE-D experiment for the Thermal–Hydraulic–Mechanical response of a bedded argillaceous formation to heating

et al. 2017

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“…The relevant parameters identified in Steps 1a and 1b were used as a starting point in Step 2 analyses. The results are documented by Garitte et al (2017). Villar et al (2012Villar et al ( , 2014 document two laboratory column tests performed in parallel, considering the THM response of (1) MX80 bentonite pellets and (2) a sand/bentonite mixture.…”

Section: Introductionmentioning

confidence: 94%

Comparative modelling of the coupled thermal–hydraulic-mechanical (THM) processes in a heated bentonite pellet column with hydration

Graupner¹,

Shao²,

Wang³

et al. 2018

Environ Earth Sci

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For the deep geological disposal of high-level radioactive waste in argillaceous rocks, the heat production of the waste is an important driver for thermal-hydraulic-mechanical (THM)-coupled processes. These THM processes influence the properties and conditions of the near field that in many repository designs contains bentonite as a clay buffer. One task in the DECOVALEX-2015 (DEvelopment of COupled models and their VALidation against Experiments) project was the modelling of a heated bentonite column (Villar et al. in Long-term THM tests reports: THM cells for the HE-E test: update of results until February 2014. Deliverable-no: D2.2-7.3. CIEMAT Technical Report IEMAT/DMA/2G210/03/2014, 2014) in preparation for the in situ heater experiment HE-E at the underground rock laboratory Mont Terri. DECOVALEX is an international cooperative project that focuses on the development and validation of mathematical models for simulating such coupled processes associated with disposal in deep geological repositories. Eight modelling teams developed their own THM-coupled models for the bentonite column experiment, using six different simulation codes. Each of the teams individually calibrated the THM parameters for the bentonite material. The eight resulting parameter sets agree well and allow a satisfactory reproduction of the TH measurements by all models. The modelling results for the evolution of temperature and relative humidity over time at three sensors in the bentonite column are in good agreement between the teams and with the measured data. Also, changes of the temperature due to modifications of the insulation and the adjustment of the heating power during the course of the experiment are well reproduced. The models were thus able to reproduce the main physical processes of the experiment, both for vapour-dominated diffusion during the heating phase and combined liquid and vapour transport during a subsequent heating and hydration phase. Based on the parameter sets, the teams predict a penetration of the water infiltration front in the 48-cm column filled with bentonite pellets to a depth between 25 and 35 cm over the 15,000 h (i.e. over 20 months) of the hydration phase of the experiment.

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“…The results of modeling of heater experiments at Mont Terri and Bure showed the need to take into account anisotropic thermal conductivity to match temperature measurements at the experiments (Garitte et al, 2017). Anisotropic thermal conductivity is not standard in TOUGH2 and TOUGH-FLAC and was implemented into the TOUGH2 source code.…”

Section: Shale Constitutive Thm Models In Tough-flacmentioning

confidence: 99%

Investigation of Coupled Processes in Argillite Rock: FY18 Progress

Rutqvist

Kim

et al. 2018

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In some cases there may be a milestone where an item is being fabricated, maintenance is being performed on a facility, or a document is being issued through a formal document control process where it specifically calls out a formal review of the document. In these cases, documentation (e.g., inspection report, maintenance request, work planning package documentation or the documented review of the issued document through the document control process) of the completion of the activity, along with the Document Cover Sheet, is sufficient to demonstrate achieving the milestone. NOTE 2: If QRL 1, 2, or 3 is not assigned, then the QRL 4 box must be checked, and the work is understood to be performed using laboratory specific QA requirements. This includes any deliverable developed in conformance with the respective National Laboratory / Participant, DOE or NNSA-approved QA Program NOTE 3: If the lab has an NQA-1 program and the work to be conducted requires an NQA-1 program, then the QRL-1 box must be checked in the work Package and on the Appendix E cover sheet and the work must be performed in accordance with the Lab's NQA-1 program. The QRL-4 box should not be checked

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Evaluation of the predictive capability of coupled thermo-hydro-mechanical models for a heated bentonite/clay system (HE-E) in the Mont Terri Rock Laboratory

Cited by 29 publications

References 14 publications

Modelling the Mont Terri HE-D experiment for the Thermal–Hydraulic–Mechanical response of a bedded argillaceous formation to heating

Modelling the Mont Terri HE-D experiment for the Thermal–Hydraulic–Mechanical response of a bedded argillaceous formation to heating

Comparative modelling of the coupled thermal–hydraulic-mechanical (THM) processes in a heated bentonite pellet column with hydration

Investigation of Coupled Processes in Argillite Rock: FY18 Progress

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