The excavation damaged zone in clay formations – time-dependent behaviour and influence on performance assessment

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The excavation damaged zone in clay formations – time-dependent behaviour and influence on performance assessment. / Peter, Blümling; Bernier, Frédéric; Lebon, Patrick; Martin, C. Derek; Bastiaens, Wim (Peer reviewer).

In: Physics and Chemistry of the Earth, Vol. 32, No. 8-14, 02.2007, p. 588-599.

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Peter, Blümling ; Bernier, Frédéric ; Lebon, Patrick ; Martin, C. Derek ; Bastiaens, Wim. / The excavation damaged zone in clay formations – time-dependent behaviour and influence on performance assessment. In: Physics and Chemistry of the Earth. 2007 ; Vol. 32, No. 8-14. pp. 588-599.

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@article{4c40d5b769384af8b8bbe65ef7b272df,
title = "The excavation damaged zone in clay formations – time-dependent behaviour and influence on performance assessment",
abstract = "Clay formations in their natural state exhibit very favourable conditions for disposal of radioactive waste. One concern regarding waste disposal is that due to the necessary underground excavations and the associated disturbance and damage in the area close to these excavations, the favourable properties of such formations could change and the host rock could lose part of its barrier function. Stress redistribution will lead to the creation of a so-called excavation damaged zone (EDZ) which will be controlled by the initial stress field, the material properties (e.g., material anisotropy), the existence of natural fracture zones or local inhomogeneities of the rock mass and the geometry of the tunnel. Comprehensive investigations at different sites (e.g., HADES, Belgium, Mont Terri, Switzerland, Tournemire, France) have shown that an EDZ occurs in soft or plastic clays as well as in indurated and more brittle claystones. Performance assessment calculations for different repository designs in different clay host rock formations show that the influence of the EDZ on radionuclide release is quite limited. It has been shown that even for very conservative, so-called ‘‘what if?’’ cases the very stringent regulatory guidelines can be met.",
keywords = "Excavation disturbed zone, radionuclide transport, performance assessment, hydraulic conductivity",
author = "Bl{\"u}mling Peter and Fr{\'e}d{\'e}ric Bernier and Patrick Lebon and Martin, {C. Derek} and Wim Bastiaens",
note = "Score = 10",
year = "2007",
month = "2",
doi = "10.1016/j.pce.2006.04.034",
language = "English",
volume = "32",
pages = "588--599",
journal = "Physics and Chemistry of the Earth",
issn = "1474-7065",
publisher = "Elsevier",
number = "8-14",

}

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TY - JOUR

T1 - The excavation damaged zone in clay formations – time-dependent behaviour and influence on performance assessment

AU - Peter, Blümling

AU - Bernier, Frédéric

AU - Lebon, Patrick

AU - Martin, C. Derek

A2 - Bastiaens, Wim

N1 - Score = 10

PY - 2007/2

Y1 - 2007/2

N2 - Clay formations in their natural state exhibit very favourable conditions for disposal of radioactive waste. One concern regarding waste disposal is that due to the necessary underground excavations and the associated disturbance and damage in the area close to these excavations, the favourable properties of such formations could change and the host rock could lose part of its barrier function. Stress redistribution will lead to the creation of a so-called excavation damaged zone (EDZ) which will be controlled by the initial stress field, the material properties (e.g., material anisotropy), the existence of natural fracture zones or local inhomogeneities of the rock mass and the geometry of the tunnel. Comprehensive investigations at different sites (e.g., HADES, Belgium, Mont Terri, Switzerland, Tournemire, France) have shown that an EDZ occurs in soft or plastic clays as well as in indurated and more brittle claystones. Performance assessment calculations for different repository designs in different clay host rock formations show that the influence of the EDZ on radionuclide release is quite limited. It has been shown that even for very conservative, so-called ‘‘what if?’’ cases the very stringent regulatory guidelines can be met.

AB - Clay formations in their natural state exhibit very favourable conditions for disposal of radioactive waste. One concern regarding waste disposal is that due to the necessary underground excavations and the associated disturbance and damage in the area close to these excavations, the favourable properties of such formations could change and the host rock could lose part of its barrier function. Stress redistribution will lead to the creation of a so-called excavation damaged zone (EDZ) which will be controlled by the initial stress field, the material properties (e.g., material anisotropy), the existence of natural fracture zones or local inhomogeneities of the rock mass and the geometry of the tunnel. Comprehensive investigations at different sites (e.g., HADES, Belgium, Mont Terri, Switzerland, Tournemire, France) have shown that an EDZ occurs in soft or plastic clays as well as in indurated and more brittle claystones. Performance assessment calculations for different repository designs in different clay host rock formations show that the influence of the EDZ on radionuclide release is quite limited. It has been shown that even for very conservative, so-called ‘‘what if?’’ cases the very stringent regulatory guidelines can be met.

KW - Excavation disturbed zone

KW - radionuclide transport

KW - performance assessment

KW - hydraulic conductivity

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_82734

UR - http://knowledgecentre.sckcen.be/so2/bibref/4405

U2 - 10.1016/j.pce.2006.04.034

DO - 10.1016/j.pce.2006.04.034

M3 - Article

VL - 32

SP - 588

EP - 599

JO - Physics and Chemistry of the Earth

JF - Physics and Chemistry of the Earth

SN - 1474-7065

IS - 8-14

ER -

ID: 309753