Analysis of the THM behaviour in a clay-based engineered barrier system (EBS): modelling of the HE-E experiment (Mont Terri URL)

Wang, Xuerui; Shao, Hua; Hesser, Jürgen; Kolditz, Olaf

doi:10.1007/s12665-016-6116-1

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…This task is summarized in three synthesis papers for each of the three sub-tasks, with Garitte et al (2017a) focusing on a comparative analysis of THM models simulating the HE-D test, Graupner et al (2018) evaluating collaborative THM modelling of the heated bentonite pellet column, and Garitte et al (2017b) summarizing the predictive capability of THM models to simulate a complex heated bentonite-clay system as observed in the HE-E experiment. Individual team contributions are given in Pan et al (2017), Ofoegbu et al (2017), and Wang et al (2016), respectively. The first two papers describe the development and testing of new modeling approaches to prepare for this task: Pan et al (2017) studied the coupled thermo-hydro-mechanical processes in column bentonite tests using a new elastoplastic cellular automaton (EPCA) method, and Ofoegbu et al (2017) investigated mechanical behavior of unsaturated expansive soils based on the Bishop principle of effective stress.…”

Section: • Study Of the He-e Experiments At Mont Terri Rock Labo-mentioning

confidence: 99%

“…The first two papers describe the development and testing of new modeling approaches to prepare for this task: Pan et al (2017) studied the coupled thermo-hydro-mechanical processes in column bentonite tests using a new elastoplastic cellular automaton (EPCA) method, and Ofoegbu et al (2017) investigated mechanical behavior of unsaturated expansive soils based on the Bishop principle of effective stress. Finally, Wang et al (2016) analyzed THM behavior in a clay-based engineered and natural barrier system (EBS) and modeled the full complexity of the HE-E experiment.…”

Section: • Study Of the He-e Experiments At Mont Terri Rock Labo-mentioning

confidence: 99%

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DECOVALEX-2015: an international collaboration for advancing the understanding and modeling of coupled thermo-hydro-mechanical-chemical (THMC) processes in geological systems

et al. 2018

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Section: • Study Of the He-e Experiments At Mont Terri Rock Labo-mentioning

confidence: 99%

Section: • Study Of the He-e Experiments At Mont Terri Rock Labo-mentioning

confidence: 99%

DECOVALEX-2015: an international collaboration for advancing the understanding and modeling of coupled thermo-hydro-mechanical-chemical (THMC) processes in geological systems

et al. 2018

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“…Unsaturated soils widely distribute around the world, such as deep geological disposals Birkholzer et al, 2018), semi-arid / arid zones (Agam et al, 2004;Pfletschinger et al, 2012), and coastal regions (Gerscovich et al, 2006;Saghravani et al, 2016). During the service of geotechnical and geo-environmental engineering facilities working under high temperature, e.g., nuclear waste repositories (Wang et al, 2016;Birkholzer et al, 2018), heated pipelines (Zhao et al, 2014;Zhu et al, 2020) and energy piles (Laloui and Di Donna, 2013;Zheng et al, 2016), heat transfers to the surrounding soils, causing thermal expansion of pore gas, liquid and solid, as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

A model on assessing effects of gas diffusion in multifield coupled process for unsaturated soils

Wang

Zhu

et al. 2023

Environ Earth Sci

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Gas diffusion is an important process in thermo-hydro-mechanical coupled problems of unsaturated soils, e.g., nuclear waste repositories or heated pipeline engineering, which usually strongly affects process of liquid water evaporation and water vapor condensation, migration of air and water, heat transfer and skeleton deformation. This paper develops a simple model to assess the effects of gas diffusion on multifield coupled process of unsaturated soils, providing predicting guidance and uniform judgment rather than establishing a numerical coupled model by traditional methods. A dimensionless characteristic number is first proposed and expressed by sediment properties and environmental conditions. Rationality of this characteristic number is then assessed and validated by numerical results, and studies indicated that the gas diffusion is crucial when the characteristic number exceeds a critical one, which is reflected in early valleys of gas / liquid pressure increment induced by vapor condensation and the final maximum value. It can be found from the expression that this characteristic number is highly relevant to diffusion coefficient, permeability, temperature, initial saturation and gas pressure. Parametric studies indicate that gas diffusion appears to be critical for unsaturated clayey soils, provided the diffusion coefficient is larger than 10 -7 m 2 /s and permeability smaller than 10 -14 m 2 . The effect can be neglected for soils with diffusion coefficient is lower than 10 -9 m 2 /s or permeability greater than 10 -14 m 2 .

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Section: Introductionmentioning

confidence: 99%

A model on assessing effects of gas diffusion in multifield coupled process for unsaturated soils

Wang

Zhu

et al. 2022

Preprint

View full text Add to dashboard Cite

Gas diffusion is an important process in thermo-hydro-mechanical coupled problems of unsaturated soils, e.g., nuclear waste repositories or heated pipeline engineering, which usually strongly affects process of liquid water evaporation and water vapor condensation, migration of air and water, heat transfer and skeleton deformation. This paper develops a simple model to assess the effects of gas diffusion on multifield coupled process of unsaturated soils, providing predicting guidance and uniform judgment rather than establishing a numerical coupled model by traditional methods. A dimensionless characteristic number is first proposed and expressed by sediment properties and environmental conditions. Rationality of this characteristic number is then assessed and validated by numerical results, and studies indicated that the gas diffusion is crucial when the characteristic number exceeds a critical one, which is reflected in early valleys of gas / liquid pressure increment induced by vapor condensation and the final maximum value. It can be found from the expression that this characteristic number is highly relevant to diffusion coefficient, permeability, temperature, initial saturation and gas pressure. Parametric studies indicate that gas diffusion appears to be critical for unsaturated clayey soils, provided the diffusion coefficient is larger than 10-7 m2/s and permeability smaller than 10-14 m2. The effect can be neglected for soils with diffusion coefficient is lower than 10-9 m2/s or permeability greater than 10-14 m2.

show abstract

Analysis of the THM behaviour in a clay-based engineered barrier system (EBS): modelling of the HE-E experiment (Mont Terri URL)

Cited by 4 publications

References 11 publications

DECOVALEX-2015: an international collaboration for advancing the understanding and modeling of coupled thermo-hydro-mechanical-chemical (THMC) processes in geological systems

DECOVALEX-2015: an international collaboration for advancing the understanding and modeling of coupled thermo-hydro-mechanical-chemical (THMC) processes in geological systems

A model on assessing effects of gas diffusion in multifield coupled process for unsaturated soils

A model on assessing effects of gas diffusion in multifield coupled process for unsaturated soils

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