VIJADUKT PEHARE TEMELJENJE U SLOŽENIM GEOLOŠKIM USLOVIMA NA LOKACIJI KLIZIŠTA PEHARE
The Pehare Viaduct is located on the 2nd subsection of the Zenica Bypass Motorway at Corridor Vc which is under construction. Based on engineering geological mapping and performed investigation works, it was found that the viaduct is placed in two completely different geological zones (chalk flysch and oligomiocene sediments) separated by the fault zone. The oligomiocene complex is characterized as a landslide. During the preparation of Geotechnical Performance Study Mission G31, an additional investigation works were carried out on piers location, and inclinometers were installed. The results of the measurements on the inclinometers have shown that there are significant displacements at higher depths, resulting in a change of the foundation construction compared to the solution given in the main design. The problem of terrain stability on the one part of theviaduct and the foundation in two different geological zones with fault between them, emphasises this viaduct as one of the most complex on this subsection. This paper describes the structure of the viaduct, viaduct foundations based on the determined sliding zones, and a review of the geotechnical analysis with the risk analysis.