Articles | Volume 12, issue 7
Research article
13 Jul 2021
Research article |  | 13 Jul 2021

Mechanical and hydraulic properties of the excavation damaged zone (EDZ) in the Opalinus Clay of the Mont Terri rock laboratory, Switzerland

Sina Hale, Xavier Ries, David Jaeggi, and Philipp Blum

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Cited articles

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Amann, F., Button, E. A., Evans, K. F., Gischig, V. S., and Blümel, M.: Experimental Study of the Brittle Behavior of Clay shale in Rapid Unconfined Compression, Rock Mech. Rock Eng., 44, 415–430,, 2011. 
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Amann, F., Wild, K. M., Loew, S., Yong, S., Thoeny, R. and Frank, E.: Geomechanical behaviour of Opalinus Clay at multiple scales: results from Mont Terri rock laboratory (Switzerland), Swiss J. Geosci., 110, 151–171,, 2017. 
Aoyagi, K. and Ishii, E.: A Method for Estimating the Highest Potential Hydraulic Conductivity in the Excavation Damaged Zone in Mudstone, Rock Mech. Rock Eng., 52, 385–401,, 2019. 
Short summary
The construction of tunnels leads to substantial alterations of the surrounding rock, which can be critical concerning safety aspects. We use different mobile methods to assess the hydromechanical properties of an excavation damaged zone (EDZ) in a claystone. We show that long-term exposure and dehydration preserve a notable fracture permeability and significantly increase strength and stiffness. The methods are suitable for on-site monitoring without any further disturbance of the rock.