Thermal Impact on Damaged Boom Clay and Opalinus Clay: Permeameter and Isostatic Tests with μCT Scanning

Chen, Guangjing; Maes, T.; Vandervoort, F.; Sillen, X.; Marcke, Philippe Van; Honty, M.; Dierick, M.; Vanderniepen, Pieter

doi:10.1007/s00603-012-0334-y

Cited by 34 publications

(10 citation statements)

References 5 publications

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“…Figure 9 presents the data of an isostatic test carried out on the Boom Clay. The fairly constant intrinsic permeability detected at various temperatures confirmed that the increase in hydraulic conductivity with temperature was only due to the (reversible) decrease in water viscosity (Chen et al 2013), as already shown in the Boom Clay by Delage et al (2000).…”

Section: Safety-relevant Aspects Of Thm Perturbation and Evolutionsupporting

confidence: 78%

“…This suggests that the pore structure of the clay matrix was not affected by the temperature increase. Similar tests carried out with cement water (representative of the near field pore water composition of a repository with concrete barriers and cementitious backfill) showed that pore water chemistry had little influence on the permeability of the Boom Clay (Chen et al 2013). …”

Section: Safety-relevant Aspects Of Thm Perturbation and Evolutionmentioning

confidence: 82%

“…Sealing was clearly demonstrated for all the damaged Boom Clay samples in the permeameter and isostatic tests (Chen et al 2013). The sealing rate appeared to be fast: sealing of the fractured Boom Clay samples occurred within a few days in the permeameter cells.…”

Section: Maintenance Of the Self-sealing Capacity After The Thermal Lmentioning

confidence: 93%

“…Unlike Boom Clay, a decrease in intrinsic permeability (Figure 10 (b)) was observed with the increasing temperature (Chen et al 2013). The same phenomenon was also observed in the Mont Terri in situ SE-H heater test (Vietor et al 2010) in which the intrinsic permeability showed a continuous decrease by a factor of about 4 when the temperature at the measurement point increased from 15.1°C to 65.3°C.…”

Section: Safety-relevant Aspects Of Thm Perturbation and Evolutionmentioning

confidence: 94%

See 3 more Smart Citations

Consequences of the Thermal Transient on the Evolution of the Damaged Zone Around a Repository for Heat-Emitting High-Level Radioactive Waste in a Clay Formation: a Performance Assessment Perspective

Weetjens

Sillen

et al. 2013

Rock Mech Rock Eng

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The rights are held by Springer-Verlag Wien.The final publication is available at http://link.springer.com. Results from the TIMODAZ project indicate that the favourable properties of the clay host rock, which guarantee the effectiveness of the safety functions of the repository system, are expected to be maintained after the heating-cooling cycle. Hence, the basic assumptions usually made in PA calculations so far are expected to remain valid, and the performance of the system should not be affected in a negative way by the thermal evolution of the DZ around a radioactive waste repository in clay host rock.

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Section: Safety-relevant Aspects Of Thm Perturbation and Evolutionsupporting

confidence: 78%

Section: Safety-relevant Aspects Of Thm Perturbation and Evolutionmentioning

confidence: 82%

Section: Maintenance Of the Self-sealing Capacity After The Thermal Lmentioning

confidence: 93%

Section: Safety-relevant Aspects Of Thm Perturbation and Evolutionmentioning

confidence: 94%

See 2 more Smart Citations

Consequences of the Thermal Transient on the Evolution of the Damaged Zone Around a Repository for Heat-Emitting High-Level Radioactive Waste in a Clay Formation: a Performance Assessment Perspective

Weetjens

Sillen

et al. 2013

Rock Mech Rock Eng

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“…In recent years techniques such as X-ray CT scanning, synchrotron X-ray imaging and Nuclear Magnetic Resonance (NMR) imaging have been applied to the studies of gas movement in argillaceous materials (Beseulle et al, 2013;Chen et al, 2014). However, these methods tend not to have the nano-metre scale necessary for clay mineral visualization, and are generally not compatible with the long duration necessary to investigate flow in argillaceous materials.…”

Section: Introductionmentioning

confidence: 99%

The visualization of flow paths in experimental studies of clay-rich materials

et al. 2015

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One of the most challenging aspects of understanding the flow of gas and water during testing in clay-rich low-permeability materials is the difficulty in visualizing localized flow. Whilst understanding has been increased using X-ray Computed-tomography (CT) scanning, synchrotron X-ray imaging and Nuclear Magnetic Resonance (NMR) imaging, real-time testing is problematic under realistic in situ conditions confining pressures, which require steel pressure vessels. These methods tend not to have the nano-metre scale resolution necessary for clay mineral visualization, and are generally not compatible with the long duration necessary to investigate flow in such materials. Therefore other methods are necessary to visualize flow paths during post-mortem analysis of test samples. Several methodologies have been established at the British Geological Survey (BGS), in order to visualize flow paths both directly and indirectly. These include: (1) the injection of fluorescein-stained water or deuterium oxide; (2) the introduction of nanoparticles that are transported by carrier gas; (3) the use of radiologically tagged gas; and (4) the development of apparatus for the direct visualization of clay. These methodologies have greatly increased our understanding of the transport of water and gas through intact and fractured clay-rich materials. The body of evidence for gas transport through the formation of dilatant pathways is now considerable. This study presents observations using a new apparatus to directly visualize the flow of gas in a kaolinite paste. The results presented provide an insight into the flow of gas in clay-rich rocks. The flow of gas through dilatant pathways has been shown in a number of argillaceous materials (Angeli et al., 2009;Autio et al., 2006;Cuss et al., 2014;Harrington et al., 2012). These pathways are pressure induced and an increase in gas pressure leads to the dilation of pathways. Once the gas breakthrough occurs, pressure decreases and pathways begin to close. This new approach is providing a unique insight into the complex processes involved during the onset, development and closure of these dilatant gas pathways.

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A solution around a backfilled cavity in a low‐permeability poroelastic medium with application in in situ heating tests

Chen

Weetjens

2016

Num Anal Meth Geomechanics

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Thermo-hydro-mechanical responses around a cylindrical cavity drilled or excavated in a low-permeability formation are studied when the cavity is subjected to a time-dependent thermal loading. The cavity is considered backfilled after it is supported by casing or lining. Solutions of temperature, pore water pressure, stress, and displacement responses are analytically formulated based on Biot's consolidation theory with the assumption that the backfilling material, supporting material, and surrounding low-permeability formation are poroelastic media. The solution is expressed in Laplace space, and numerical inversion techniques are used to find field variables in the real-time domain. After the solution is verified with the numerical results, it is applied in a large-scale in situ heating test -PRACLAY heating testfor a predictive reference calculation and an extensive parametric study. Another medium-scale in situ heating test -ATLAS III heating testis also analyzed using the solution, which provides reasonable agreement with measurements. The new analytical solution proves to be a convenient tool for a good understanding of the resulting coupled thermo-hydro-mechanical behavior and is therefore valuable for the interpretation of measured data in engineering practices and for a rational design of potential radioactive waste repositories.

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Thermal Impact on Damaged Boom Clay and Opalinus Clay: Permeameter and Isostatic Tests with μCT Scanning

Cited by 34 publications

References 5 publications

Consequences of the Thermal Transient on the Evolution of the Damaged Zone Around a Repository for Heat-Emitting High-Level Radioactive Waste in a Clay Formation: a Performance Assessment Perspective

Consequences of the Thermal Transient on the Evolution of the Damaged Zone Around a Repository for Heat-Emitting High-Level Radioactive Waste in a Clay Formation: a Performance Assessment Perspective

The visualization of flow paths in experimental studies of clay-rich materials

A solution around a backfilled cavity in a low‐permeability poroelastic medium with application in in situ heating tests

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