Abstract
The rock slide that occurred in Montenegro in May 2019, damaged the support of the Uvač 4 highway viaduct under construction. The rock sliding happened in the mountain section, where the terrain is composed of tectonically crushed flysch sediments represented by sandstones, marlstones, and siltstones. Initially, deformations appeared on the ground with the formation of a 90m long scar, that after four weeks the movement of the L2O1 support of the Uvac 4 viaduct by more than 40 cm was registered. Additional geological investigation works were carried out and the sliding plane was registered with inclinometer measurements at a depth of 18m. Rehabilitation works included the formation of the new deep foundation supporting structures and securing the slope with cable anchors. The paper analyzed the values of flysch sediment shear parameters given in the rehabilitation project, as well as the adopted rock mass disturbance factor. The assessment is that the main reason for sliding terrain is caused by stress relief.
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