Figure 6.
Schematic representation of a gallery, excavation damaged zone (EDZ), with its discontinuities, and clayey host rock, with bedding planes. The gas flux originates from the gallery. The anisotropy of the material and/or the anisotropy of in situ stresses determine the shape of the excavation-induced discontinuities Refer to the image caption for details.The diagram presents a tunnel embedded in clayey host rock with a labelled excavation damaged zone. Bedding planes extend through the rock mass while excavation induced discontinuities form a fractured network around the tunnel. The damaged zone surrounds the tunnel indicating structural changes due to excavation.

Schematic representation of a gallery, excavation damaged zone (EDZ), with its discontinuities, and clayey host rock, with bedding planes. The gas flux originates from the gallery. The anisotropy of the material and/or the anisotropy of in situ stresses determine the shape of the excavation-induced discontinuities

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