Exploring Fissure Opening and Their Connectivity in a Cenozoic Clay During Gas Injection

Gonzalez‐Blanco, Laura; Romero, E.; Jommi, Cristina; Sillen, X.; Li, Xiangling

doi:10.1007/978-3-319-52773-4_33

Cited by 12 publications

(10 citation statements)

References 11 publications

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“…Finally, after the gas injection, undrained unloading was carried out to avoid water uptake during this process, resulting in negligible expansion. In this manner, suction developed due to the stress relief preserved the pore-network, which allowed the microstructure to be studied after the gas injection (Gonzalez-Blanco et al 2017).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The existence of macro-pores or initial discontinuities, such as bedding planes, may impact gas transport properties. Therefore, a good initial characterisation of the microstructure will allow for the identification of possible variations that may affect gas permeability, which is very sensitive to microstructural changes, due to the growth of micro-cracks or fissures in the rock mass (Gonzalez-Blanco et al 2017).…”

Section: Microstructural Analysesmentioning

confidence: 99%

“…Mercury Intrusion Porosimetry (MIP) tests were carried out to characterise the microstructure of the three formations at the initial state (Romero and Simms 2008;Gonzalez-Blanco et al 2017). In addition, the pore-network description was complemented by nitrogen adsorption tests to cover a wider range of pore sizes following the Barrett, Joyner and Halenda (BJH) method using the desorption information (Webb and Orr 1997).…”

Section: Microstructural Analysesmentioning

confidence: 99%

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Hydro-mechanical Response to Gas Transfer of Deep Argillaceous Host Rocks for Radioactive Waste Disposal

Gonzalez‐Blanco

Romero

Marschall³

et al. 2021

Rock Mech Rock Eng

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During recent decades, argillaceous sedimentary formations have been studied as potential host formations for the geological disposal of long-living and heat-emitting radioactive waste—Boom Clay in Belgium and Opalinus Clay and Brown Dogger in Switzerland. A significant issue in the long-term performance of these potential host rocks concerns the generation and transport of gases. The pressure resulting from the generation of gas in an almost impermeable geological medium in the near field of a repository will increase. Under high gas pressures, the mechanical and hydraulic properties of the host rock are expected to change significantly. Preferential gas pathways may develop which exploit material heterogeneity, anisotropy (bedding planes), rock discontinuities, or interfaces between the different components of the repository, and may eventually lead to the release of the produced gases. Gas flow through these clayey rocks is investigated on the basis of laboratory work. Priority has been given to studying the volume change response of these initially water-saturated materials through relatively fast and controlled volume-rate gas injections. The effect of the gas injection rate, the confining pressure and the bedding orientation on the gas transport properties have been studied with particular attention paid to the coupling with strain behaviour. The results have shown features common to the three formations concerning the gas transfer process through preferential pathways, despite their initially differential properties.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Microstructural Analysesmentioning

confidence: 99%

Section: Microstructural Analysesmentioning

confidence: 99%

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Hydro-mechanical Response to Gas Transfer of Deep Argillaceous Host Rocks for Radioactive Waste Disposal

Gonzalez‐Blanco

Romero

Marschall³

et al. 2021

Rock Mech Rock Eng

Self Cite

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“…Therefore, a minimum of 1 MPa can be accepted as the difference between total vertical stress and maximum gas pressure to avoid preferential gas flows between the sample and the oedometer ring [11].…”

Section: Experimental Protocols On the Saturated Mixturementioning

confidence: 99%

Gas transport in a binary bentonite mixture used in sealing systems

2023

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Binary mixtures composed of 80% of high-density pellets and 20% of granular bentonite at hygroscopic water content are currently considered for use in vertical sealing systems for the deep and longterm disposal of radioactive wastes. By pouring the dry components without compaction, the mixturedisplays a dry density of around 1.49 Mg/m3. However, these sealing systems are subjected to long-term hydrations from the surrounding formations with the possibility of having zones with entrapped and generated gas that makes it challenging to display a homogeneous saturation of the seal. Therefore, gas transport through these bentonite-based sealing materials at different degrees of saturation is a crucial issue. Hence, several oedometer tests have been conducted to evaluate the impact of gas injection on this mixture at different degrees of saturation and constant pouring dry density. These gas injection/dissipation tests were performed at constant vertical stress or constant volume conditions. The results provided the variation of the effective gas permeability at different degrees of saturation and the gas breakthrough pressure aftersaturation. Furthermore, these gas transport results were interpreted with a microstructural study of the mixture focusing on the volumetric filling of the inter-pellet porosity.

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“…Intrinsic permeability results are shown in Figure 6 as a function of porosity. Data reported by different authors [15][16][17]…”

Section: Water Permeabilitymentioning

confidence: 99%

Microstructural and hydro-mechanical behaviour of bentonite pellets and powder mixtures

et al. 2020

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Binary mixtures of high-density MX-80 bentonite pellets (80%) and bentonite powder (20%) at hygroscopic water content have been recently considered as an alternative engineered barrier system for the long-term disposal of radioactive wastes. These mixtures display a dry density of around 1.49 Mg/m3 on pouring and present components with multi-modal pore size distributions that significantly evolve during the hydro-mechanical paths. To better understand the hydro-mechanical behaviour of this multiple porosity mixture, the contribution initially focuses on describing the initial state, as well as the main microstructural features determined by mercury intrusion porosimetry tests for the mix and each of the components (pellets and powder). Afterwards, hydro-mechanical results of both components and the mixture are presented. The hydraulic results focus on the water retention and water permeability, while the mechanical tests concentrate on the compressibility properties on loading.

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Exploring Fissure Opening and Their Connectivity in a Cenozoic Clay During Gas Injection

Cited by 12 publications

References 11 publications

Hydro-mechanical Response to Gas Transfer of Deep Argillaceous Host Rocks for Radioactive Waste Disposal

Hydro-mechanical Response to Gas Transfer of Deep Argillaceous Host Rocks for Radioactive Waste Disposal

Gas transport in a binary bentonite mixture used in sealing systems

Microstructural and hydro-mechanical behaviour of bentonite pellets and powder mixtures

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