The landslide is located in the hinterland of water source "Studenac" in the local community Gornja Cadjavica near Bijeljina. The field where the triggered landslide occurred is conditionally stable slope. It is overgrown with forest trees and therefore it was not a subject of interest in terms of its stability until the water source and accompanying local road have been constructed in the lower part of the slope. Additionally the slope was undercut resulting in jeopardizing its conditional natural stability. At first, it was about some slight ground movements requiring no significant interventions.As the time was passing by site conditions have been changing. During winter and spring time movement of rock blocks is more intense due to large amount of surface and underground water whereby such a process was significantly slower and almost calm in the summer time. Such a cycle was repeated for several years until late 2010 when massive collapse of the unstable zone, which might be called 'landslide', endangered not only the local road but also the water source.For the purposes of overviewing the site and landslide characteristics as a whole, exhaustive researches were carried out within the part of the site affected by sliding at the surface of about 0,4 ha. A field surveying of wider area was also conducted. The landslide is located at relatively steep slope where the height distance between the crown and the toe of the landslide is 14,0 m. General slope angle is up to 10 0 and in those parts where landslides occur they are up to 25 0 . Sliding plane has been formed at depth of 2,5 to 4 m depending on terrain morphology, in clay of high plasticity (CH groups). The main cause of landslides is surface and underground water.Within the scope of remediation project two restorative measures were applied. The main recovery measure was placement of AB retaining concrete wall which was intended to accept the pressures of soil mass and to prevent it from slipping, namely to maintain the slope in stable condition. The other remedial measure was construction of an open perimeter canal at the slope above the retaining wall for the purposes of collecting surface water flowing towards the main body of the landslide and its diversion outside the sliding area.

SUMMARYThe railway Samac -Sarajevo was built in the fifties of the twentieth century, as a significant part of the railway that connects the central part of the former Yugoslavia with the Sava River. Later, in the seventies another track of Doboj and Zenica was built what was the most important by that time. In general the railway is situated on the corridor V, which links the Adriatic Sea via Sarajevo and Buda pest. Over time, the tracks are worn, damaged and speed has been reduced to about 40 km/hour.As part of the revitalization of the railway network in the former Yugoslavia, the reconstruction of the Samac -Adriatic Sea began, which is divided by sections. One of these sectionsis the section km 103 + 500 -Maglaj, a more demanding one compared to previous section from Samac to the now named section. The point is that the terrain along the route of the railway needs to be viewed from the aspect of geologi cal features, then the characteristics of the embankment so the geotechnical conditions for the revitalization of the railway line for speeds of 120 km/hour can be provided.Conducted field investigations along the route of the railway, as well as laboratory tests on samples provided enough data in the corridor route, while the wider area could not be perceived because of the mine field. However, the previous studies for the purposes of the General Geological Map, scale 1: 100 000, and field observations along the route line gave a satisfactory level of data for assessment of geological and engineering geological characteristics of the terrain.

Researched section of the railway route presents a part of the route from Sarajevo to Doboj, built withtwo tracks. First track was built in 1947, and the second in 1978. In construction methods are presentdifferences, considering the time when it was constructed and the way of construction. Both tracks wereused for years for movement of trains of various purposes and speeds up to 100 km/hour. Over time,the railroad worsened, especially at the beginning of the nineteenth century, when the train speed wasreduced on some sections to less than 40 km/hour. Revitalization of the railway was done by sectionswith the task to prepare it for train speed of 120 km/hour.Evaluation of railway route situation is given based on surveys carried out in the field andlaboratory tests of taken samples. The route was researched rigorously in its corridor, since it has amovement restriction on its wider area. Regular train lines were maintained which slowedinvestigations and some research works could not have been applied. Therefore, were appliedresearches that were possible to realize in high quality.