Erfahrungs- und Forschungsbericht 2012 - Ensi

Erfahrungs- und Forschungsbericht 2012 - Ensi

Assessment 2012 and

Perspectives for 2013

Rigorous integration of geological mapping, drillcore

logging, optical televiewer imaging und seismic

refraction measurements provided essential

data to investigate the relationship between the

natural and excavation-induced fracture network

in tectonically disturbed Opalinus Clay at the Mont

Terri underground research laboratory. Consideration

of pre-existing faults and fault zones and

their mechanical characteristics was necessary to

understand both the failure mechanisms and the

spatial distribution of macroscopic EDZ fractures

around the RC experiment. Complementary, the

synthesis of geological and monitoring data revealed

a series of fundamental new findings regarding

the spatial and temporal evolution of the

displacement field around the RC section and thus

on the short- and long-term rock mass behavior

in transversely isotropic clay rocks. The successful

integration of the field data in combination with

three-dimensional numerical modeling allows us

to investigate the stress redistribution around the

RC experiment and thus the influence of fault

zones on the rock mass behavior in the near-field

of a repository.

The final phase of the project will be spent for

further numerical analyses in a systematic manner

and for reporting of the RC experiment in its

entirety. The major findings and results of this research

project including all data sets and a complete

description of the experiment layout will be

compiled in a dissertation and published in several

international journals. Complementary, further

laboratory tests will be conducted to establish

the relationship between total suction and unconfined

compressive strength of P-specimens, and to

validate the rock water characteristic curve.


[1] F. Amann, R. Thoeny, C.D. Martin (2012):

Rock mechanical considerations associated

with the construction of a nuclear waste

repository in clay rock, paper presented at

the 46 th US Rock Mechanics/Geomechanics

Symposium 2012, Chicago, American Rock

Mechanics Association, ARMA

[2] F. Barpi, S. Valente, M. Cravero, G. Iabichino,

C. Fidelibus (2012): Fracture mechanics characterization

of an anisotropic geomaterial.

Engineering Fracture Mechanics, Volume 84,

pp 111–122

[3] S. Valente, C. Fidelibus, S. Loew, M. Cravero,

G. Iabichino, F. Barpi (2012): Analysis of Fracture

Mechanics Tests on Opalinus Clay. Rock

Mechanics and Rock Engineering, Volume

45, Issue 5, pp 767–779


[1] F. Amann, E.A. Button, M. Blümel, R. Thoeny

(2010b): Insight into the mechanical behaviour

of Opalinus Clay. Paper presented at

European Rock Mechanics Symposium 2010,

Lausanne, Switzerland, Rock Mechanics and

Environmental Engineering, edited by Zhao,

Labious, Dudt and Mathier, Taylor & Francis

Group, London, ISBN 978-0-415-58654-2.

[2] F. Amann, E.A. Button, K.F. Evans, V.S. Gischig,

M. Blümel (2011a): Experimental study of the

brittle behavior of clay shale in short-term unconfined

compression. Rock Mech Rock Eng,

44 (4), 415–430.

[3] F. Amann, P.K. Kaiser, E.A. Button (2011b):

Experimental study of the brittle behavior of

clay shale in rapid confined compression. Rock

Mech Rock Eng, 44 (1), 21–33.

[4] A. Ferrari and L. Laloui (2013) : Advances in

the testing of the hydro-mechanical behav-iour

of shales. L. Laloui and A. Ferrari (Eds.): Multiphysical

Testing of Soils and Shales, SSGG, pp.

57–68. Springer-Verlag Berlin Heidelberg 2013.

[5] Itasca (2006): Fast Lagrangian Analysis of Continua

in 3 Dimensions (FLAC 3D), Version 4.0,

Itasca Consulting Group Inc., Minneapolis,


[6] J.-C. Mayor , M. Velasco, J.-L. Garcia-Sineriz

(2007): Ventilation experiment in the Mont Terri

underground laboratory. Physics and Chemistry

of the Earth 32 (2007) 616–628.


ENSI Erfahrungs- und Forschungsbericht 2012

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