Dubravci landslide remediation design
The Dubravci landslide is located west of the Dubravci town, on state road DC3, section 012 at km 4+400, in Karlovac County.
For this project we carried out the engineering geological and geotechnical investigation and testing and made the main and detailed landslide remediation design. During the execution of the works, we also carried out the complete supervision of the remediation.
As part of the Brebornica landslide remediation design on the state road DC1, section 011, at km 4+500, our design included the planned works aimed at increasing the overall stability of the slope, the construction of a rainwater drainage system, and the reconstruction of the road. Landslide remediation included the implementation of the following remediation measures:
– construction of pile wall from reinforced concrete drilled piles;
– construction of a drainage system; and
– road reconstruction.
In order to protect the central part of the landslide, a pile wall of reinforced concrete drilled piles with a length of L=10.0 m in two rows at an axial distance of 2.50 m in the longitudinal and transverse directions was constructed. After the construction of the piles, a layer of mechanically stabilized granular stone material with a granulation of Ø 0–63 mm and a thickness of 75.0 cm was laid. A geogrid was embedded inside the stone material. In the next phase, a Terramesh system was built to protect the central part of the landslide. The gabion baskets with the dimensions 1.0 x 1.0 x 2.0 m are made in five rows. The total length of the Terramesh system was 4.0 m, and the geotextile was laid on the back face of the gabion. In order to protect the sides of the landslide, a pile wall of reinforced concrete drilled piles with a length of L=10.0 m in one row at an axial distance of 2.25 m was constructed. After the construction of the piles, a reinforced concrete capping beam of 0.50×0.80 m, made of concrete of compressive strength class C 30/37, was constructed.
During the works, a pile integrity test (PIT) was conducted on all the piles. A total of 54 piles were executed on the landslide (the central part and the sides of the landslide).
