Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay

Fatemeh Salehnia; Robert Charlier; Xavier Sillen; Arnaud Dizier

Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay

Fatemeh Salehnia, Robert Charlier, Xavier Sillen, Arnaud Dizier

Research output › peer-review

3 Scopus citations

Abstract

Deep disposal of the high-level nuclear wastes in the potential geological formations is a promising option for the long-lived radioactive waste management. A damaged zone with significant irreversible deformations and important host rock's properties changes is expected to be created around the underground galleries due to the excavation process that this zone is called as Excavation Damaged Zone (EDZ). The excavation process of the Connecting gallery in the Boom clay formation (Mol, Belgium) is analyzed in this study. Since during its construction, the localized crack propagation was observed around the gallery, we propose to analyze the EDZ and its extension around the Connecting gallery in the framework of strain localization approach. Numerical modeling of strain localization needs a specific approach to overcome the practical problem of mesh size dependency within the framework of classical finite elements. Therefore, the second gradient method as an enhanced technique is applied to adjust this problem. This study is aimed to model the coupled hydro-mechanical behavior of the Boom clay host-rock during the construction of the Connecting gallery.Aquarter of the gallery is studied by symmetry in the plane strain conditions and under the initial anisotropic stress state providing the information on the evolution of strain localization in shear bands mode accomplished by the extension of EDZ. In addition, considering a concrete lining on the gallery wall, a discussion on the contact pressure on the interface between the massive and the lining is performed simultaneously by the evolution of shearing bands in the vicinity of the gallery.

Original language	English
Title of host publication	Computer Methods and Recent Advances in Geomechanics
Subtitle of host publication	Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
Publisher	Taylor & Francis (CRC)
Pages	335-340
Number of pages	6
ISBN (Print)	9781138001480
State	Published - 2015
Event	14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 - Kyoto Duration: 22 Sep 2014 → 25 Sep 2014

Publication series

Name	Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
Publisher	Taylor and Francis - Balkema

Conference

Conference	14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
Abbreviated title	IACMAG 2014
Country/Territory	Japan
City	Kyoto
Period	2014-09-22 → 2014-09-25

ASJC Scopus subject areas

Computer Science Applications
Geochemistry and Petrology

Access to Document

Modeling of Excavation Damaged Zone through the strain localization-1Accepted author manuscript, 3.33 MBLicense: Unspecified

Cite this

Salehnia, F., Charlier, R., Sillen, X., & Dizier, A. (2015). Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay. In Computer Methods and Recent Advances in Geomechanics: Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 (pp. 335-340). (Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014). Taylor & Francis (CRC).

Salehnia, Fatemeh ; Charlier, Robert ; Sillen, Xavier et al. / Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay. Computer Methods and Recent Advances in Geomechanics: Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014. Taylor & Francis (CRC), 2015. pp. 335-340 (Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014).

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title = "Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay",

abstract = "Deep disposal of the high-level nuclear wastes in the potential geological formations is a promising option for the long-lived radioactive waste management. A damaged zone with significant irreversible deformations and important host rock's properties changes is expected to be created around the underground galleries due to the excavation process that this zone is called as Excavation Damaged Zone (EDZ). The excavation process of the Connecting gallery in the Boom clay formation (Mol, Belgium) is analyzed in this study. Since during its construction, the localized crack propagation was observed around the gallery, we propose to analyze the EDZ and its extension around the Connecting gallery in the framework of strain localization approach. Numerical modeling of strain localization needs a specific approach to overcome the practical problem of mesh size dependency within the framework of classical finite elements. Therefore, the second gradient method as an enhanced technique is applied to adjust this problem. This study is aimed to model the coupled hydro-mechanical behavior of the Boom clay host-rock during the construction of the Connecting gallery.Aquarter of the gallery is studied by symmetry in the plane strain conditions and under the initial anisotropic stress state providing the information on the evolution of strain localization in shear bands mode accomplished by the extension of EDZ. In addition, considering a concrete lining on the gallery wall, a discussion on the contact pressure on the interface between the massive and the lining is performed simultaneously by the evolution of shearing bands in the vicinity of the gallery.",

keywords = "Excavation, Geomechanics, Boom clay, Gradient methods, Radioactive wastes, Waste disposal",

author = "Fatemeh Salehnia and Robert Charlier and Xavier Sillen and Arnaud Dizier",

year = "2015",

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booktitle = "Computer Methods and Recent Advances in Geomechanics",

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Salehnia, F, Charlier, R, Sillen, X & Dizier, A 2015, Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay. in Computer Methods and Recent Advances in Geomechanics: Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014. Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014, Taylor & Francis (CRC), pp. 335-340, 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014, Kyoto, Japan, 2014-09-22.

Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay. / Salehnia, Fatemeh; Charlier, Robert; Sillen, Xavier et al.
Computer Methods and Recent Advances in Geomechanics: Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014. Taylor & Francis (CRC), 2015. p. 335-340 (Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014).

Research output › peer-review

TY - GEN

T1 - Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay

AU - Salehnia, Fatemeh

AU - Charlier, Robert

AU - Sillen, Xavier

AU - Dizier, Arnaud

PY - 2015

Y1 - 2015

N2 - Deep disposal of the high-level nuclear wastes in the potential geological formations is a promising option for the long-lived radioactive waste management. A damaged zone with significant irreversible deformations and important host rock's properties changes is expected to be created around the underground galleries due to the excavation process that this zone is called as Excavation Damaged Zone (EDZ). The excavation process of the Connecting gallery in the Boom clay formation (Mol, Belgium) is analyzed in this study. Since during its construction, the localized crack propagation was observed around the gallery, we propose to analyze the EDZ and its extension around the Connecting gallery in the framework of strain localization approach. Numerical modeling of strain localization needs a specific approach to overcome the practical problem of mesh size dependency within the framework of classical finite elements. Therefore, the second gradient method as an enhanced technique is applied to adjust this problem. This study is aimed to model the coupled hydro-mechanical behavior of the Boom clay host-rock during the construction of the Connecting gallery.Aquarter of the gallery is studied by symmetry in the plane strain conditions and under the initial anisotropic stress state providing the information on the evolution of strain localization in shear bands mode accomplished by the extension of EDZ. In addition, considering a concrete lining on the gallery wall, a discussion on the contact pressure on the interface between the massive and the lining is performed simultaneously by the evolution of shearing bands in the vicinity of the gallery.

AB - Deep disposal of the high-level nuclear wastes in the potential geological formations is a promising option for the long-lived radioactive waste management. A damaged zone with significant irreversible deformations and important host rock's properties changes is expected to be created around the underground galleries due to the excavation process that this zone is called as Excavation Damaged Zone (EDZ). The excavation process of the Connecting gallery in the Boom clay formation (Mol, Belgium) is analyzed in this study. Since during its construction, the localized crack propagation was observed around the gallery, we propose to analyze the EDZ and its extension around the Connecting gallery in the framework of strain localization approach. Numerical modeling of strain localization needs a specific approach to overcome the practical problem of mesh size dependency within the framework of classical finite elements. Therefore, the second gradient method as an enhanced technique is applied to adjust this problem. This study is aimed to model the coupled hydro-mechanical behavior of the Boom clay host-rock during the construction of the Connecting gallery.Aquarter of the gallery is studied by symmetry in the plane strain conditions and under the initial anisotropic stress state providing the information on the evolution of strain localization in shear bands mode accomplished by the extension of EDZ. In addition, considering a concrete lining on the gallery wall, a discussion on the contact pressure on the interface between the massive and the lining is performed simultaneously by the evolution of shearing bands in the vicinity of the gallery.

KW - Excavation

KW - Geomechanics

KW - Boom clay

KW - Gradient methods

KW - Radioactive wastes

KW - Waste disposal

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M3 - In-proceedings paper

AN - SCOPUS:84907323082

SN - 9781138001480

T3 - Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014

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BT - Computer Methods and Recent Advances in Geomechanics

PB - Taylor & Francis (CRC)

T2 - 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014

Y2 - 22 September 2014 through 25 September 2014

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Salehnia F, Charlier R, Sillen X, Dizier A. Modeling of Excavation Damaged Zone through the strain localization approach in Boom clay. In Computer Methods and Recent Advances in Geomechanics: Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014. Taylor & Francis (CRC). 2015. p. 335-340. (Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014).