Measurement of in-situ stress in weak rocks at Mont Terri Rock Laboratory, Switzerland

Martin, C. Derek; Lanyon, G. W.

doi:10.1016/s1365-1609(03)00113-8

Cited by 121 publications

(81 citation statements)

References 9 publications

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“…The laboratory is located in an anticline of the folded Jura (Switzerland) and therefore the in situ conditions are strongly influenced by the tectonic overprint. According to Martin and Lanyon (2003), stress estimates using various methods indicate a sub-vertical orientation of the largest principal stress with a magnitude of 6.5 to 7…”

Section: In This Context the Timodaz Project (Thermal Impact On The mentioning

confidence: 99%

“…Distinct fracture patterns are observed around boreholes and galleries at the Mont Terri Underground Laboratory, depending on their orientation with respect to bedding and to the in situ stress field (Martin and Lanyon 2003, Bossart et al 2002. Bedding plane failure is found particularly prominent when the opening axis is oriented parallel to bedding.…”

Section: In Situ Observationsmentioning

confidence: 99%

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Laboratory and In Situ Simulation Tests of the Excavation Damaged Zone Around Galleries in Opalinus Clay

Labiouse

Vietor

2013

Rock Mech Rock Eng

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Section: In This Context the Timodaz Project (Thermal Impact On The mentioning

confidence: 99%

Section: In Situ Observationsmentioning

confidence: 99%

Laboratory and In Situ Simulation Tests of the Excavation Damaged Zone Around Galleries in Opalinus Clay

Labiouse

Vietor

2013

Rock Mech Rock Eng

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“…More information about the in situ stress field at the Mont Terri rock laboratory can be found in Martin and Lanyon (2003). The bedding plane has an inclination of 10°in this part of the laboratory and the displacements are prevented in the horizontal direction at the left boundary and in the vertical direction at the bottom of the presented area.…”

Section: Model Set-upmentioning

confidence: 99%

“…This effect is incorporated in the model by an isotropic, linear swelling model, proposed by Rutqvist et al (2001). Information about the swelling behaviour of the claystone can be found in Bock (2000) and Martin and Lanyon (2003). A general overview of the presented coupled hydraulic-mechanical model is given in Fig.…”

Section: Introductionmentioning

confidence: 99%

Coupled hydraulic-mechanical simulation of seasonally induced processes in the Mont Terri rock laboratory (Switzerland)

Ziefle¹,

Matray²,

Maßmann³

et al. 2017

Swiss J Geosci

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This paper focuses on hydraulic-mechanical effects in the Mont Terri rock laboratory (Switzerland) and investigates their impact on pore pressure, the convergence of a niche and the evolution of pre-existing cracks in the wallrock of the niche. A comparison of measurements with numerical simulation results is conducted. The presented in situ measurements include long-term data on temperature, relative humidity, and niche convergence, as well as crackmeter and jointmeter measurements determining the aperture of a bedding-parallel crack. Furthermore, timedomain-reflectometry measurements were carried out in a borehole located in the niche wall close to the crack. They provide information on the water content of the claystone. The numerical simulation is carried out with OpenGeoSys. It contains a 2-dimensional coupled hydraulic-mechanical model considering orthotropy, swelling and shrinkage effects, linear elastic material behaviour and an excavation damaged zone characterized by a zone of lower rock strength. An additional focus is laid on the evolution of cracks in the wallrock of the niche. The presented model approach allows a prediction of the temporal evolution of a desaturated zone incorporating a seasonally influenced part. The comparison with measured water contents yields good agreement. Simulation results and measurements consistently predict a convergence of the niche. The evolution of the crack aperture is influenced by long-term as well as seasonallyinfluenced effects. Due to the convergence of the niche, the long-term trend is characterized by closure of the crack. Furthermore, the seasonally influenced desaturation in winter results in opening of the crack, while the resaturation in the warm and wet summer months leads to closure of the crack. Finally, the comparison of simulation results with measurements indicates qualitative agreement. As a matter of fact, the numerical model seems to represent significant effects concerning the evolution of the crack aperture of a single crack.

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“…The non-associated and drained parameters of this model, estimated from laboratory and in situ tests [16,32,33], are presented in Table 2.…”

Section: Assumptionsmentioning

confidence: 99%

Hydro-mechanical modelling of the excavation damaged zone around an underground excavation at Mont Terri Rock Laboratory

Levasseur

Charlier

Frieg

et al. 2010

International Journal of Rock Mechanics and Mining Sciences

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a b s t r a c tA zone with significant irreversible deformations and significant changes in flow and transport properties is expected to be formed around underground excavations in indurated clay. The stress perturbation around the excavation could lead to a significant increase of the permeability, related to diffuse and/or localised crack propagation in the material. The main objective of this study is to model these processes at large scale in order to assess their impacts on the performance of radioactive waste geological repositories. This paper concerns particularly the hydro-mechanical modelling of a long-term dilatometer experiment performed in Mont Terri Rock Laboratory in Switzerland. The proposed model defines the permeability as a function of the aperture of the cracks that are generated during the excavation. With this model, the permeability tensor becomes anisotropic. Advantages and drawbacks of this approach are described using the results of the Selfrac long-term dilatometer experiment.

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Measurement of in-situ stress in weak rocks at Mont Terri Rock Laboratory, Switzerland

Cited by 121 publications

References 9 publications

Laboratory and In Situ Simulation Tests of the Excavation Damaged Zone Around Galleries in Opalinus Clay

Laboratory and In Situ Simulation Tests of the Excavation Damaged Zone Around Galleries in Opalinus Clay

Coupled hydraulic-mechanical simulation of seasonally induced processes in the Mont Terri rock laboratory (Switzerland)

Hydro-mechanical modelling of the excavation damaged zone around an underground excavation at Mont Terri Rock Laboratory

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