Thermal–hydraulic–mechanical behavior of bentonite and sand-bentonite materials as seal for a nuclear waste repository: Numerical simulation of column experiments

Ballarini, E.; Graupner, Bastian; Bauer, Sebastian

doi:10.1016/j.clay.2016.10.007

Cited by 45 publications

(12 citation statements)

References 21 publications

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“…Recent studies on High Level nuclear Waste (HLW) disposal program in France and Switzerland could be illustrating examples. For having a better understanding of behavior of the host medium (mainly clayey soils and clay stones) toward thermal load induced from the waste especially in long-term during thousands of years, many small-scaled and field-scaled experiments as well as numerical modeling and simulations have been done by researchers [16][17][18][19]. Akinwunmi et al [20] studied the behavior of bentonite toward temperature change since generally bentonite is used as barrier for HLW disposals.…”

Section: Introductionmentioning

confidence: 99%

A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

Hoseinimighani

Szendefy

2021

Period. Polytech. Civil Eng.

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Temperature change in soils and its possible effects date back to 20th century where temperature difference between laboratory and field for sampling made researchers interested in this topic. Due to development of technology and industry nowadays, new engineering applications such as nuclear waste disposal, oil extraction and pipelines, geothermal structures etc. have turned temperature change in soils to one of the high trending research topics where suitable knowledge of thermal effects on soils is required. For this purpose, it is tried at first to highlight the importance of temperature effect on geotechnical design by some examples and possible effect of temperature change on mechanical properties of fine soils are reviewed afterward. Investigation on results from literature proved that temperature change could alter some strength and consolidation parameters of fine soils. Different factors are proposed to be responsible for such thermally induced changes in mechanical parameters, however, existing explanations and comments from literature are diverse and not fully understood yet. In order to fill this gap, it is tried to find connections between different mechanical parameters and their behavior toward temperature change and possibly find a unified approach and factor to explain the mechanism responsible for thermally induced changes in mechanical parameters of fine soils. Finally, at the end, it is concluded that effect of temperature on structural rearrangement of solid particles could be a promising factor to connect the responses of different mechanical parameters toward temperature change.

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Section: Introductionmentioning

confidence: 99%

A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

Hoseinimighani

Szendefy

2021

Period. Polytech. Civil Eng.

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“…In several countries, a mixture of sand and compacted bentonite has also been proposed for use as a clay liner [4,8,9,12], especially at high-level waste repositories [2,6,[13][14][15][16][17]. It involves mixing sand and bentonite at different percentages, taking into consideration how the sand's size influences the permeability of the mixture [9,18].…”

Section: Introductionmentioning

confidence: 99%

The Permeability and Shear Strength of Compacted Claystone–bentonite Mixtures

Arifin¹,

Arsyad²,

Pangestu³

et al. 2021

GEOMATE

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A compacted claystone-bentonite mixture is proposed for use as a clay barrier. This research, in turn, focuses on the effects of bentonite mix on the permeability and shear strength of compacted claystonebentonite mixtures. The claystone used was obtained from the Banjarbakula landfill project, approximately 10 km from Banjarbaru, the South Kalimantan Government's Administrative Center, Indonesia. The bentonite used is commercially sold in Indonesia. The claystone was mixed with bentonite at a percentage of 5%, 10%, 15%, and 20% bentonite by dry-weight bases. The mixtures were compacted at a moisture content of 10%, 15%, and 20% to reach the dry unit weight of 16kN/m 3 -19kN/m 3 . Permeability and unconfined compressive strength tests were performed in this study. The result showed that the permeability of mixtures decreases with increasing bentonite content. The addition of up to 20% bentonite to the mixture reduced the permeability by 4.5 times, as compared to the sample without bentonite. Moreover, the mixtures' shear strength indicated by compressive strength and cohesion increased by increasing the bentonite content to 15%. The maximum shear strength obtained was three times higher than without bentonite. The mixtures' permeability and shear strength were also significantly affected by the sample's density and moisture content. A percentage of 20% bentonite is recommended, considering the wide range of acceptability based on two criteria (i.e., permeability and shear strength).

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“…In biological sciences, complex interactions between fluids and tissues have been used in modeling syrinxes formation in spinal cord (Heil & Bertram, 2016). In subsurface applications, they have been applied for modeling rock creep formation (Zhu et al, 2014), carbon-dioxide (CO 2 ) sequestration (Knauss et al, 2005;Rutqvist et al, 2007;Vilarrasa et al, 2010), hydraulic fracturing (Zheng et al, 2015), and radioactive waste disposal (Ballarini et al, 2017;Jing et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Interaction Between Fluid and Porous Media with Complex Geometries: A Direct Pore‐Scale Study

Fagbemi

Tahmasebi

Piri

2018

Water Resources Research

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Effect of boundary stress on permeability in porous media at pore‐scale is investigated by means of numerical methods for computing deformation of rock material in the presence of pore fluid. We implement a partitioned, strongly coupled solver for transient fluid‐solid simulations with independent conformed interface meshes for the fluid and solid domains. Fluid flow and solid computations were performed using the finite element method. External load is prescribed along the solid boundary in gradual steps to examine the extent of pore‐scale deformation along internal grain walls while applying a fixed constraint at the opposite end to ensure uniform stress distribution across the media. Hydrodynamic interactions between the pore walls and the matrix leading to interface displacements by fluid viscous forces are also investigated by examining fluid flow with different combinations of Reynolds number. Coupling is achieved via traction and displacements boundary conditions at the interface with respect to Lagrangian coordinates. The role of particle shape in the matrix deformation process is also considered in this paper. In order to examine the how particle shape affects local affects local permeability/stress, we examine fluid movement based on varying Reynolds numbers in Berea sandstone obtained from Micro‐CT image scans at high resolution, and artificially constructed random polydisperse 3‐D sphere packs. It was found that permeability alteration under the influence of uniaxial stress was more in the sandstone sample than in the sphere‐pack and that the sphere‐pack deformed less than the actual sample due to pore geometry, surface smoothness, and homogeneity.

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Thermal–hydraulic–mechanical behavior of bentonite and sand-bentonite materials as seal for a nuclear waste repository: Numerical simulation of column experiments

Cited by 45 publications

References 21 publications

A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

The Permeability and Shear Strength of Compacted Claystone–bentonite Mixtures

Interaction Between Fluid and Porous Media with Complex Geometries: A Direct Pore‐Scale Study

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