Erosion of buffer caused by groundwater leakages based on EMS-application

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

The bentonite barrier is an essential part of a safe spent fuel repository in granitic bedrock. The issue of saturation phase erosion of bentonite, caused by groundwater leakages, was approached theoretically and computationally. We evaluated numerically the total mass of eroded bentonite out of a cylindrical erosion channel corresponding to the case of fixed channel radius and purely suction induced free swelling, i.e. the rate swelling and erosion are equal. We observed that eroded mass loss as a function of time increases in log-log scale linearly in the active part of the erosion process, i.e. after the initial transient regime of high swelling and before the final decay towards stable buffer. The slope of the mass loss vs. time varies, but is always between 0.7 and 1.0.
Original languageEnglish
Title of host publicationCOMSOL Conference 2010 Paris
Subtitle of host publicationUser presentations and proceedings
PublisherCOMSOL
Number of pages7
ISBN (Print)978-0-9825697-7-1
Publication statusPublished - 2010
MoE publication typeB3 Non-refereed article in conference proceedings

Fingerprint

leakage
bentonite
swelling
erosion
groundwater
repository
suction
bedrock
saturation
loss

Keywords

  • bentonite
  • model
  • erosion

Cite this

Punkkinen, O., Pulkkanen, V-M., & Olin, M. (2010). Erosion of buffer caused by groundwater leakages based on EMS-application. In COMSOL Conference 2010 Paris: User presentations and proceedings COMSOL.
Punkkinen, Olli ; Pulkkanen, Veli-Matti ; Olin, Markus. / Erosion of buffer caused by groundwater leakages based on EMS-application. COMSOL Conference 2010 Paris: User presentations and proceedings. COMSOL, 2010.
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abstract = "The bentonite barrier is an essential part of a safe spent fuel repository in granitic bedrock. The issue of saturation phase erosion of bentonite, caused by groundwater leakages, was approached theoretically and computationally. We evaluated numerically the total mass of eroded bentonite out of a cylindrical erosion channel corresponding to the case of fixed channel radius and purely suction induced free swelling, i.e. the rate swelling and erosion are equal. We observed that eroded mass loss as a function of time increases in log-log scale linearly in the active part of the erosion process, i.e. after the initial transient regime of high swelling and before the final decay towards stable buffer. The slope of the mass loss vs. time varies, but is always between 0.7 and 1.0.",
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Punkkinen, O, Pulkkanen, V-M & Olin, M 2010, Erosion of buffer caused by groundwater leakages based on EMS-application. in COMSOL Conference 2010 Paris: User presentations and proceedings. COMSOL.

Erosion of buffer caused by groundwater leakages based on EMS-application. / Punkkinen, Olli; Pulkkanen, Veli-Matti; Olin, Markus.

COMSOL Conference 2010 Paris: User presentations and proceedings. COMSOL, 2010.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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T1 - Erosion of buffer caused by groundwater leakages based on EMS-application

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AU - Pulkkanen, Veli-Matti

AU - Olin, Markus

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PY - 2010

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N2 - The bentonite barrier is an essential part of a safe spent fuel repository in granitic bedrock. The issue of saturation phase erosion of bentonite, caused by groundwater leakages, was approached theoretically and computationally. We evaluated numerically the total mass of eroded bentonite out of a cylindrical erosion channel corresponding to the case of fixed channel radius and purely suction induced free swelling, i.e. the rate swelling and erosion are equal. We observed that eroded mass loss as a function of time increases in log-log scale linearly in the active part of the erosion process, i.e. after the initial transient regime of high swelling and before the final decay towards stable buffer. The slope of the mass loss vs. time varies, but is always between 0.7 and 1.0.

AB - The bentonite barrier is an essential part of a safe spent fuel repository in granitic bedrock. The issue of saturation phase erosion of bentonite, caused by groundwater leakages, was approached theoretically and computationally. We evaluated numerically the total mass of eroded bentonite out of a cylindrical erosion channel corresponding to the case of fixed channel radius and purely suction induced free swelling, i.e. the rate swelling and erosion are equal. We observed that eroded mass loss as a function of time increases in log-log scale linearly in the active part of the erosion process, i.e. after the initial transient regime of high swelling and before the final decay towards stable buffer. The slope of the mass loss vs. time varies, but is always between 0.7 and 1.0.

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Punkkinen O, Pulkkanen V-M, Olin M. Erosion of buffer caused by groundwater leakages based on EMS-application. In COMSOL Conference 2010 Paris: User presentations and proceedings. COMSOL. 2010