Sometimes two shallow-inclined joint sets produce a wedge by intersecting the excavation surface. Some of the wedges destabilize the tunnel during excavation. The stability of wedges depends upon the joint orientations, in situ stress and joint filling materials. Particularly the soil–infilled rock joints have a dominant role in controlling the stability of the wedge block due to its reduced friction and cohesion (Indraratna et al., 2010).