Simulations of THM processes in buffer-rock barriers of high-level waste disposal in an argillaceous formation

Li, Xiaoshuo; Zhang, Chunliang; Röhlig, Klaus-Jürgen

doi:10.1016/j.jrmge.2012.09.002

Cited by 13 publications

(3 citation statements)

References 3 publications

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“…Due to the complex THM coupled responses considering two-phase flow in porous media, intensive numerical coupled models have been performed with different codes, including OpenGeoSys (Bilke et al, 2019;Kolditz et al, 2012), Tough-Flac (Rutqvist et al, 2001(Rutqvist et al, , 2014, Code-bright (Li et al, 2013;Olivella et al, 1996), Comes-Geo (Cao et al, 2016;Sanavia et al, 2006), Compass (Cleall et al, 2006;Thomas et al, 1998) and others (Bond and Watson, 2008;Chen et al, 2012;Garitte et al, 2017;Rutqvist, 2015;Wu et al, 2004). Through combing advantages of Tough and Flac, respectively doing well with problems of multiphase-multicomponent flow / heat transfer and processes of soil deformation, it will be more efficient to establish complicated coupled models in Tough-Flac (Rutqvist et al, 2014).…”

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. 2023

Environ Earth Sci

View full text Add to dashboard Cite

show abstract

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

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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 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.

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“…Since the Three Gorges Project began to store water, drastic changes have taken place in the hydrodynamic field of the landslide area, which pose a threat to many landslides distributed on both sides of the reservoir [1,2]. For this reason, researches on the stability of the landslide and its corresponding prevention measures have been in full swing [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Cation Exchange Detection in the Process of Ionic Soil Stabilizer Reinforcing Soil by Laser-Induced Breakdown Spectroscopy <sup></sup>

Liu

Zeng

Zhang

et al. 2012

AMR

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In order to study the process of ionic soil stabilizer (ISS) reinforcing different kinds of soil, kaolin, red clay, landslide soil, expansive soil and quartz sand ,the five kinds of standard soil samples were treated by ISS of ratio 1:100. After 24-hour soaking and oscillation treatment, the supernatant was detected by laser-induced breakdown spectroscopy (LIBS). Comparing with the samples had not been treated by ISS, got the information of cation exchange. Experimental results showed that, the cation exchange in different soil was various, landslide soil exchanged more cation, and the cation exchange of kaolin and quartz sand was less. These studies will provide the experimental basis for ISS reinforcing mechanism research.

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Simulations of THM processes in buffer-rock barriers of high-level waste disposal in an argillaceous formation

Cited by 13 publications

References 3 publications

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

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

Cation Exchange Detection in the Process of Ionic Soil Stabilizer Reinforcing Soil by Laser-Induced Breakdown Spectroscopy <sup></sup>

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