Excavation induced fractures in a plastic clay formation: Observations at the HADES URF

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Excavation induced fractures in a plastic clay formation: Observations at the HADES URF. / Van Marcke, Philippe; Bastiaens, Wim; Li, Xiang Ling (Peer reviewer).

In: Journal of Structural Geology, Vol. 32, No. 11, 11.2010, p. 1677-1684.

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@article{c49ef9cc4a44464fbd7e1d4dddf678f7,
title = "Excavation induced fractures in a plastic clay formation: Observations at the HADES URF",
abstract = "The Belgian research programme for geological disposal of radioactive waste focuses on the Boom Clay as the potential host rock formation. To examine the feasibility of constructing an underground repository in this clay layer, an underground research facility HADES has been constructed in several stages since 1980. The two galleries most recently excavated, the Connecting Gallery in 2002 and the Praclay Gallery in 2007, were constructed by means of an industrial method using a tunnelling machine. During these excavations the hydro-mechanical response of the clay was characterised. A fracture pattern was observed consistently during the excavation of both galleries. The extent of this fractured zone was determined for the Connecting Gallery, but requires some further study. A strong hydro-mechanical coupling and a clear time dependency were noticed, even at an unexpectedly large distance from the excavation. Furthermore the Boom Clay responds in an anisotropic manner to the excavation due to anisotropy in the in situ stress state and the Boom Clay characteristics. Self-sealing processes were observed and appear to occur relatively fast.",
keywords = "plastic clay layer, excavation induced fractures, fracture pattern, extent fracture zone, hydraulic disturbance",
author = "{Van Marcke}, Philippe and Wim Bastiaens and Li, {Xiang Ling}",
note = "Score = 10; Workshop on “Fault Zones: Structure, Geomechanics, and Fluid Flow” ; Conference date: 16-09-2008 Through 18-09-2008",
year = "2010",
month = nov,
doi = "10.1016/j.jsg.2010.01.010",
language = "English",
volume = "32",
pages = "1677--1684",
journal = "Journal of Structural Geology",
issn = "0191-8141",
publisher = "Elsevier",
number = "11",

}

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TY - JOUR

T1 - Excavation induced fractures in a plastic clay formation: Observations at the HADES URF

AU - Van Marcke, Philippe

AU - Bastiaens, Wim

A2 - Li, Xiang Ling

N1 - Score = 10

PY - 2010/11

Y1 - 2010/11

N2 - The Belgian research programme for geological disposal of radioactive waste focuses on the Boom Clay as the potential host rock formation. To examine the feasibility of constructing an underground repository in this clay layer, an underground research facility HADES has been constructed in several stages since 1980. The two galleries most recently excavated, the Connecting Gallery in 2002 and the Praclay Gallery in 2007, were constructed by means of an industrial method using a tunnelling machine. During these excavations the hydro-mechanical response of the clay was characterised. A fracture pattern was observed consistently during the excavation of both galleries. The extent of this fractured zone was determined for the Connecting Gallery, but requires some further study. A strong hydro-mechanical coupling and a clear time dependency were noticed, even at an unexpectedly large distance from the excavation. Furthermore the Boom Clay responds in an anisotropic manner to the excavation due to anisotropy in the in situ stress state and the Boom Clay characteristics. Self-sealing processes were observed and appear to occur relatively fast.

AB - The Belgian research programme for geological disposal of radioactive waste focuses on the Boom Clay as the potential host rock formation. To examine the feasibility of constructing an underground repository in this clay layer, an underground research facility HADES has been constructed in several stages since 1980. The two galleries most recently excavated, the Connecting Gallery in 2002 and the Praclay Gallery in 2007, were constructed by means of an industrial method using a tunnelling machine. During these excavations the hydro-mechanical response of the clay was characterised. A fracture pattern was observed consistently during the excavation of both galleries. The extent of this fractured zone was determined for the Connecting Gallery, but requires some further study. A strong hydro-mechanical coupling and a clear time dependency were noticed, even at an unexpectedly large distance from the excavation. Furthermore the Boom Clay responds in an anisotropic manner to the excavation due to anisotropy in the in situ stress state and the Boom Clay characteristics. Self-sealing processes were observed and appear to occur relatively fast.

KW - plastic clay layer

KW - excavation induced fractures

KW - fracture pattern

KW - extent fracture zone

KW - hydraulic disturbance

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_109338

UR - http://knowledgecentre.sckcen.be/so2/bibref/7366

U2 - 10.1016/j.jsg.2010.01.010

DO - 10.1016/j.jsg.2010.01.010

M3 - Article

VL - 32

SP - 1677

EP - 1684

JO - Journal of Structural Geology

JF - Journal of Structural Geology

SN - 0191-8141

IS - 11

T2 - Workshop on “Fault Zones: Structure, Geomechanics, and Fluid Flow”

Y2 - 16 September 2008 through 18 September 2008

ER -

ID: 372370