Landslide mitigation at Vela Voda
A landslide of approximately 110 m in width and 40 m in length occurred on a part of an unstable slope along the western edge of county road in Gorski Kotar, section Crni Lug – Mrzle Vodice – Gornje Jelenje. The village of Vela Voda is located only 0.5 km north of the landslide.
We have carried out engineering geological and geotechnical exploration and investigation works in order to design the project documentation. Four (4) rotational boreholes of 10.0 m in length each and of 40.0 m total length were conducted. We have installed inclinometer tubes for stability control and observation of the exploration of the section in two of the boreholes. The observation included 5 horizontal displacement measurements carried out at one-month intervals, with a total duration of 182 days.
Landslide mitigation included works carried out to increase the overall slope stability and the performance of the precipitation drainage system.
In order to perform landslide mitigation and achieve road stability, the construction of a pile wall of reinforced concrete piles D = 800.0 mm in diameter, L = 12.0 m in length and with a horizontal spacing of 1.60 m is planned. The piles are connected to each other by reinforced concrete capping beam. For additional stability of the pile wall, rock bolts of total length L = 15.0 m are to be installed.