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Fig. 16 | Swiss Journal of Geosciences

Fig. 16

From: Analysis of tectonic structures and excavation induced fractures in the Opalinus Clay, Mont Terri underground rock laboratory (Switzerland)

Fig. 16

Geometry and kinematics of EDZ shear fractures identified during the excavation of Gallery 08, which is oriented normal to the bedding strike. a Situation prior to excavation. b Situation after excavation. Shear fractures induced during tunnel excavation are interpreted as originating from the reactivation of bedding planes and/or sub-parallel pre-existing reverse SSE-dipping faults as normal faults. These induced shear fractures were associated with down-dip striation and sense of shear, indicating normal displacement along the fracture planes

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