Berisavljević, Zoran, Marjanović, Miloš, Đurić, Uroš, Berisavljević, Zoran, Marjanović, Miloš, and Đurić, Uroš
U radu su prikazani rezultati geotehničkih istraživanja za potrebe izgradnje visećeg pešačkog mosta preko klisure reke Đetinje u Užicu. Predviđeno je da most, sistema prednapregnute trake, omogući prelaz pešacima sa desne dolinske strane na stranu Starog grada, koja je opasana strmom liticom (cca. 40 m visine). Za potrebe formiranja geotehničkog modela i strukturnog sklopa krečnjačke stenske mase korišćen je postupak fotogrametrijskog snimanja dronom. Predviđeno je da se zatežuća sila (od oko 30 MN), koju most prenosi na obalni stub, prihvati i prenese na stensku masu sistemom prednapregnutih ankera. U tom pogledu izvršena su ispitivanja nosivosti dva sidra, koja su ugrađena u subhorizontalne bušotine. Rezultati numeričkih analiza i uspešan test nosivosti sidara pokazuju da je stenska masa u stanju da izdrži sile zatezanja od mostovske konstrukcije. Pomeranja obalnog stuba su nekoliko mm u slučaju pretpostavke o kontinualnoj stenskoj masi. Kada se eksplicitno u analizu uvedu pukotine pomeranja su oko 6 cm. Ovi rezultati se morju verifikovati kroz odgovarajući monitoring tokom izgradnje mosta., This study shows the results of geotechnical investigations performed for the construction of pedestrian suspension bridge, crossing the Đetinja river in the town of Užice. The prestressed ribbon type bridge should connect the right bank of the river with the the vertical cliff (approx. 40 m high) where the Old town is located. Geotechnical model of the limestone rock mass and joint network model are formed by utilization of drone photogrammetry. The tensile force (approx. 30 MN) induced on the bridge pillar should be accepted and transfered to the rock mass by the system of prestressed anchors. Two investigation test were performed on anchors installed in sub-horizontal boreholes. Successful anchor load test and numerical analysis showed that the rock mass is capable of sustaining tensile force induced by the bridge structure. Displacements of the bridge abutment are approx. several mm for an assumption of isotropic rock mass behaviour. If joints are applied explicitly the displacements are in the order of 6 cm. These findings have to be confirmed by monitoring during the construction stage.