Remediation of the Landslide and Retaining Wall Sučević
Authors
Nikola Trbović, Boris Kereš
DOI
Abstract
On the state road DC 1, section Gračac - Knin, instability appeared under the existing reinforced concrete retaining wall in the form of a translational landslide. The landslide covered an area with a width of 60-65 m, a length of 90-115 m, and the depth of the sliding surface is at an average depth of 6 m. In total, about 35,000 m3 of material was removed. As a result of the instability in question, the foundation of the existing reinforced concrete wall was undermined, which reduces the stability of the wall and the entire road above the wall.
The remediation of the landslide provided by the design includes the construction of a supporting structure made of reinforced earth with facing of concrete modular blocks. Stabilization of the existing retaining wall foresees the installation of geotechnical self-drilling anchors with a diameter of 38 mm and a length of 15 m.
The supporting structure is divided into six cascades, each of which consists of the mentioned system: concrete modular blocks, geogrids and embankment.
Displacements of the structure during construction were measured with inclinometers and the measurements were compared with the designed displacements.
Each level of the supporting structure has its own lining foundation with dimensions of 0.60×0.20 m, while the lowest level has a line foundation with dimensions of 0.80×0.40 m, under which there are micropiles with diameter of 180 mm and length of 6 m, at an axial distance of 2 m.
In this project, 11.375 pieces of concrete blocks were installed, whose total mass is 227,5 tons. In total, 4300 m3 of stone material with a granulation of 0-75 mm and 4300 m2 of geogrid were installed inside the reinforced earth structure.