Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL)

Maarten Van Geet; Wim Bastiaens; Geert Volckaert; B. Vallejan; A. Gens

Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL)

Maarten Van Geet, Wim Bastiaens, Geert Volckaert, B. Vallejan, A. Gens

Research output › peer-review

Abstract

In 1996 the EC funded project of RESEAL started. The aim of this project was to demonstrate the possibility of sealing off a shaft in plastic clay with bentonite and to test its efficiency. During the installation, the concrete lining of the shaft has been removed, which gave the unique opportunity to visualise the EDZ. Moreover, the piezometers installed for the RESEAL project gave some additional information on the evolution of the EDZ. From all these observations it is clear that fractures developed or existing fractures were re-activated during the removal of the lining. Up to at least 1 meter from the shaft lining - host rock interface, fractures were in contact with atmospheric pressure. These fractures are oriented cylindrically around the shaft at the position where the lining had been removed. Above and below the zone where the lining was removed, a decompression is noticed. In these zones, however, no evidence for fractures in connection with atmospheric pressure is observed. The self-healing of the host-rock is a slow process. The exact timing is difficult to extract from this experiment as it is largely influenced by the time needed for the hydration of the bentonite seal. It was observed that the self-healing is progressively taking place from deeper in the host-rock towards the interface host rock - shaft lining.

Original language	English
Title of host publication	European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories
Editors	C. Davies, F. Bernier
Place of Publication	Luxemburg
Publisher	European Commission
Pages	207-212
Number of pages	6
ISBN (Print)	92-894-8794-1
State	Published - Nov 2003
Event	2003 - European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories - Luxemburg Duration: 3 Nov 2003 → 5 Nov 2003

Publication series

Name	EUR reports
Publisher	Office for official publications of the European Communities
Number	EUR-21028

Conference

Conference	2003 - European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories
Country/Territory	Luxembourg
City	Luxemburg
Period	2003-11-03 → 2003-11-05

Access to Document

https://op.europa.eu/en/publication-detail/-/publication/99a07bde-8a5d-49ff-9bb0-23c42949846d/language-en/format-PDF/source-292787205License: Unspecified

Cite this

Van Geet, M., Bastiaens, W., Volckaert, G., Vallejan, B., & Gens, A. (2003). Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL). In C. Davies, & F. Bernier (Eds.), European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories (pp. 207-212). (EUR reports; No. EUR-21028). European Commission. https://op.europa.eu/en/publication-detail/-/publication/99a07bde-8a5d-49ff-9bb0-23c42949846d/language-en/format-PDF/source-292787205

Van Geet, Maarten ; Bastiaens, Wim ; Volckaert, Geert et al. / Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL). European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories. editor / C. Davies ; F. Bernier. Luxemburg : European Commission, 2003. pp. 207-212 (EUR reports; EUR-21028).

@inproceedings{cfc9cf8a2b9f4e6fab0985633fa01a04,

title = "Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL)",

abstract = "In 1996 the EC funded project of RESEAL started. The aim of this project was to demonstrate the possibility of sealing off a shaft in plastic clay with bentonite and to test its efficiency. During the installation, the concrete lining of the shaft has been removed, which gave the unique opportunity to visualise the EDZ. Moreover, the piezometers installed for the RESEAL project gave some additional information on the evolution of the EDZ. From all these observations it is clear that fractures developed or existing fractures were re-activated during the removal of the lining. Up to at least 1 meter from the shaft lining - host rock interface, fractures were in contact with atmospheric pressure. These fractures are oriented cylindrically around the shaft at the position where the lining had been removed. Above and below the zone where the lining was removed, a decompression is noticed. In these zones, however, no evidence for fractures in connection with atmospheric pressure is observed. The self-healing of the host-rock is a slow process. The exact timing is difficult to extract from this experiment as it is largely influenced by the time needed for the hydration of the bentonite seal. It was observed that the self-healing is progressively taking place from deeper in the host-rock towards the interface host rock - shaft lining. ",

keywords = "Boom Clay, Plastic clay, Radioactive waste disposal",

author = "{Van Geet}, Maarten and Wim Bastiaens and Geert Volckaert and B. Vallejan and A. Gens",

year = "2003",

month = nov,

language = "English",

isbn = "92-894-8794-1",

series = "EUR reports",

publisher = "European Commission",

number = "EUR-21028",

pages = "207--212",

editor = "C. Davies and F. Bernier",

booktitle = "European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories",

note = "2003 - European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories ; Conference date: 03-11-2003 Through 05-11-2003",

}

Van Geet, M, Bastiaens, W, Volckaert, G, Vallejan, B & Gens, A 2003, Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL). in C Davies & F Bernier (eds), European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories. EUR reports, no. EUR-21028, European Commission, Luxemburg, pp. 207-212, 2003 - European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories, Luxemburg, Luxembourg, 2003-11-03. <https://op.europa.eu/en/publication-detail/-/publication/99a07bde-8a5d-49ff-9bb0-23c42949846d/language-en/format-PDF/source-292787205>

Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL). / Van Geet, Maarten; Bastiaens, Wim; Volckaert, Geert et al.
European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories. ed. / C. Davies; F. Bernier. Luxemburg: European Commission, 2003. p. 207-212 (EUR reports; No. EUR-21028).

Research output › peer-review

TY - GEN

T1 - Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL)

AU - Van Geet, Maarten

AU - Bastiaens, Wim

AU - Volckaert, Geert

AU - Vallejan, B.

AU - Gens, A.

PY - 2003/11

Y1 - 2003/11

N2 - In 1996 the EC funded project of RESEAL started. The aim of this project was to demonstrate the possibility of sealing off a shaft in plastic clay with bentonite and to test its efficiency. During the installation, the concrete lining of the shaft has been removed, which gave the unique opportunity to visualise the EDZ. Moreover, the piezometers installed for the RESEAL project gave some additional information on the evolution of the EDZ. From all these observations it is clear that fractures developed or existing fractures were re-activated during the removal of the lining. Up to at least 1 meter from the shaft lining - host rock interface, fractures were in contact with atmospheric pressure. These fractures are oriented cylindrically around the shaft at the position where the lining had been removed. Above and below the zone where the lining was removed, a decompression is noticed. In these zones, however, no evidence for fractures in connection with atmospheric pressure is observed. The self-healing of the host-rock is a slow process. The exact timing is difficult to extract from this experiment as it is largely influenced by the time needed for the hydration of the bentonite seal. It was observed that the self-healing is progressively taking place from deeper in the host-rock towards the interface host rock - shaft lining.

AB - In 1996 the EC funded project of RESEAL started. The aim of this project was to demonstrate the possibility of sealing off a shaft in plastic clay with bentonite and to test its efficiency. During the installation, the concrete lining of the shaft has been removed, which gave the unique opportunity to visualise the EDZ. Moreover, the piezometers installed for the RESEAL project gave some additional information on the evolution of the EDZ. From all these observations it is clear that fractures developed or existing fractures were re-activated during the removal of the lining. Up to at least 1 meter from the shaft lining - host rock interface, fractures were in contact with atmospheric pressure. These fractures are oriented cylindrically around the shaft at the position where the lining had been removed. Above and below the zone where the lining was removed, a decompression is noticed. In these zones, however, no evidence for fractures in connection with atmospheric pressure is observed. The self-healing of the host-rock is a slow process. The exact timing is difficult to extract from this experiment as it is largely influenced by the time needed for the hydration of the bentonite seal. It was observed that the self-healing is progressively taking place from deeper in the host-rock towards the interface host rock - shaft lining.

KW - Boom Clay

KW - Plastic clay

KW - Radioactive waste disposal

M3 - In-proceedings paper

SN - 92-894-8794-1

T3 - EUR reports

SP - 207

EP - 212

BT - European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories

A2 - Davies, C.

A2 - Bernier, F.

PB - European Commission

CY - Luxemburg

T2 - 2003 - European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories

Y2 - 3 November 2003 through 5 November 2003

ER -

Van Geet M, Bastiaens W, Volckaert G, Vallejan B, Gens A. Reconnaissance Study of EDZ around a Large Scale Shaft Sealing Demonstration Test (RESEAL). In Davies C, Bernier F, editors, European Commission cluster conference and workshop on the impact of the excavation disturbed or damaged zone on the performance of radioactive waste geological repositories. Luxemburg: European Commission. 2003. p. 207-212. (EUR reports; EUR-21028).