The tunnel Suhodol - T3 is a twin motorway tunnel, of approximate length of 2800m, located at the part of the Motorway at the Section Lepenica - Tarcin at Corridor Vc at Bosnia and Herzegovina. The tunnel excavation was carried out within the complex of Bosnian Schist Mountains. The geological structure was heavily affected by the tectonic forces, so that the majority of the tunnel excavation was carried out in poor to very poor rock. The instability problems occurred in the shale section, in which heavily weathered material was found during the progression through the fault zone, which was also water bearing. The numerical back analyses of the event were carried out with an aim to resolve the stress-strain and deformation field around the tunnel after the collapse. The parameters of the rock mass were adjusted so as to simulate the progression of the event. The same parameters were then used to devise the necessary remedial measures that were implemented in the right tube. The possible mechanisms of failure are discussed and the remedial measures, which were successfully applied, are described in the paper.
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