ABSTRACT
For the purposes of the Konjsko tunnel design, geological, engineering-geological, hydro geological and geotechnical investigations have been performed in the wider area of the south and north tube route (Grabovac et al., 2004). The engineeringgeological and geotechnical investigation works have been performed in order to define the composition and physical and mechanical properties of deposits, thickness of quaternary deposits, as well as elevations at which flysch deposits appear on the western part of both tubes. Positions of limestone sediments and characteristic discontinuities have also been recorded. Selected samples of marl and limestones were laboratory tested. The above mentioned investigations and obtained data provided a design engineers’ base for geotechnical categorization of rock masses (according to RMR and Q systems), for designing of the tunnel support system and for selection of the tunnel excavation technology.
