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Swiss Journal of Geosciences
Fig. 7 | Swiss Journal of Geosciences

Fig. 7

From: Hydro-mechanical evolution of the EDZ as transport path for radionuclides and gas: insights from the Mont Terri rock laboratory (Switzerland)

Fig. 7

Conceptual models of EDZ, derived in the framework of Mont Terri Project: a radial distribution of extensile fracturing (tunnel axis normal to bedding strike, sub-parallel to σhmax; see also Bossart et al. 2002); b combined buckling failure and extensile fracturing (tunnel axis normal to bedding strike, sub-parallel to σhmax; see also Blümling et al. 2007); c schematic representation of the damage zone around the HG-A microtunnel, showing the key processes and features that affect borehole stability: slablike breakouts on the upper left side are caused by extensile failure along tectonic fractures and wedge-like breakouts on the right side

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