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The first section of the Smokovac-Mateševo highway in Montenegro was built, with a length of 41 km. Half of the route was formed within flysch sediments, along which numerous terrain instabilities were registered during construction. The most significant landslide was registered in the area of the Uvač 4 bridge, where 100 000 m3 of material was moved by the formation of a sliding plane at a depth of 20 m. Initially, deformations appeared on the ground with the formation of a 27 m-long scar, and later the movement of the L2O1 support of the Uvač 4 bridge by more than 40 cm was registered. Extensive rehabilitation works were carried out by forming deep foundation supporting structures and securing the slope with cable anchors.
The paper analyzed the values of the physical-mechanical parameters of flysch sediments given in the main project, as well as the shear parameters of flysch sediments obtained by reverse stability analysis.
In the end, an assessment of the cause of terrain instability is given, as well as a description of the performed rehabilitation works.
