A capillarity-advective model for gas break-through in clays

Graham, J.; Halayko, Krista Gelmich; Hume, Harold B.; Kirkham, Timothy; Gray, Μ. N.; Oscarson, D. W.

doi:10.1016/s0013-7952(01)00106-5

Cited by 61 publications

(22 citation statements)

References 9 publications

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“…The following gas migration mechanisms are usually assumed, which can be simultaneously present in a given material at variable degrees of importance and involving single phase (either liquid or gas) or two phase flow transport (Alonso et al (Tang and Cui 2005) 2002; Ortiz et al 2002;Graham et al 2002;Marshall et al 2005):…”

Section: Gas Permeabilitymentioning

confidence: 99%

“…Different techniques, such as electric impedance tomography (Borsic et al 2005) and the use of gas tracers have been proposed for the detection of gas flow paths. Experimental research on this topic, in which a constant gas injection rate has been used to increase the gas pressure to the point of breakthrough, has been reported by Horseman et al (1999) on saturated soils using isotropic stress conditions, and by Gallé (2000), Hume (1999) and Graham et al (2002) using constant volume oedometer cells. Figure 19 shows a scheme of the experimental gas migration testing system for gas breakthrough pressure determination with constant volumetric gas injection rate.…”

Section: Gas Permeabilitymentioning

confidence: 99%

“…Figure 19 shows a scheme of the experimental gas migration testing system for gas breakthrough pressure determination with constant volumetric gas injection rate. Regarding unsaturated soils, Gallé (2000) and Graham et al (2002) Fig. 18 Controlled-suction isotropic cell with axis translation technique and experimental layout for gas pressure decay method to determine gas permeability saturation increases, the increase being more sudden-the resistance to gas migration increases sharply-at degrees of saturation higher than 95% as shown in Fig.…”

Section: Gas Permeabilitymentioning

confidence: 99%

See 2 more Smart Citations

Geoenvironmental Testing

Delage

Romero

2008

Geotech Geol Eng

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Section: Gas Permeabilitymentioning

confidence: 99%

Section: Gas Permeabilitymentioning

confidence: 99%

Section: Gas Permeabilitymentioning

confidence: 99%

See 1 more Smart Citation

Geoenvironmental Testing

Delage

Romero

2008

Geotech Geol Eng

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“…In the majority of cases, flow by means of dilation/fracture processes has been concluded, occurring due to high gas pressures. A typical response found was that gas pressures were able to increase with only limited flow, until a critical pressure; thereafter, gas flow was able to occur more easily and pressure was reduced (Galle, 2000;Graham et al, 2002;Harrington and Horseman, 2003;Horseman et al, 1999;Pusch et al, 1985). Additionally, none of the experimental works showed a large degree of clay desaturation.…”

Section: Introductionmentioning

confidence: 99%

“…Galle, 2000;Graham et al, 2002;Harrington and Horseman, 2003;Horseman et al, 1999;Pusch et al, 1985). In almost all of the programmes, a fully saturated buffer is considered, which results in extremely low gas permeability due to the pores being filled with pore water.…”

Section: Introductionmentioning

confidence: 99%

Simulation of repository gas migration in a bentonite buffer

Thomas¹,

Masum²,

Chen³

et al. 2014

Proceedings of the Institution of Civil Engineers - Engineering

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The inventory of high-level radioactive waste in the UK is likely to be disposed of in a geological disposal facility, which will generate gases due to processes such as anoxic metal corrosion and water radiolysis. Such gases have the potential to migrate through the repository system and may be detrimental to the engineered barrier system by damaging the physical fabric of the buffer material through the build-up of pressure. An investigation into the migration of gases and the ranges of gas pressures expected in such a repository is presented. A model of gas transport is presented to simulate the transport of gases in conjunction with coupled thermo-hydro-chemical-mechanical processes. This model includes a boundary condition linking the corrosion behaviour to gas generation and water supply. A realistic range of gas generation rates has been established from available data alongside realistic ranges of material properties of a bentonite buffer. Numerical simulations were then undertaken for a range of realistic scenarios considering the corrosion processes and buffer properties.It was found that in all realistic cases, including realistic maxima and minima considered, the risk of pneumatic fracture was negligible.

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Gas migration at the granite–bentonite interface under semirigid boundary conditions in the context of high‐level radioactive waste disposal

Liu,

Wang,

Guo

et al. 2024

Deep Underground Science and Engineering

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The corrosion of waste canisters in the deep geological disposal facilities (GDFs) for high‐level radioactive waste (HLRW) can generate gas, which escapes from the engineered barrier system through the interfaces between the bentonite buffer blocks and the host rock and those between the bentonite blocks. In this study, a series of water infiltration and gas breakthrough experiments were conducted on granite and on granite–bentonite specimens with smooth and grooved interfaces. On this basis, this study presents new insights and a quantitative assessment of the impact of the interface between clay and host rock on gas transport. As the results show, the water permeability values from water infiltration tests on granite and granite–bentonite samples (10−19–10−20 m2) are found to be slightly higher than that of bentonite. The gas permeability of the mock‐up samples with smooth interfaces is one order of magnitude larger than that of the mock‐up with grooved interfaces. The gas results of breakthrough pressures for the granite and the granite–bentonite mock‐up samples are significantly lower than that of bentonite. The results highlight the potential existence of preferential gas migration channels between the rock and bentonite buffer that require further considerations in safety assessment.

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A capillarity-advective model for gas break-through in clays

Cited by 61 publications

References 9 publications

Geoenvironmental Testing

Geoenvironmental Testing

Simulation of repository gas migration in a bentonite buffer

Gas migration at the granite–bentonite interface under semirigid boundary conditions in the context of high‐level radioactive waste disposal

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