ISTRAŽIVANJE I SANACIJA KLIZIŠTA "RATAC", BAR, CRNA GORA

Abstract

The "Ratac" landslide occurs on the section of Belgrade-Bar international railway from railway station Sutomore to railway station Bar. The paper deals with the rehabilitation of the "Ratac" landslide, which extends from km 449+309.00 to km 449+473.00, with a total length of 164m, and which was created in the last unfavorable geological structure (paleo - gully filled with a thick deluvium over 15 m), changing climatic conditions, inflow of groundwater and load from trains. Geodetic surveys and monitoring of landslide activity (2018), geotechnical and geological research, monitoring of measuring devices (2018-2020), monitoring of installed piezometers and geophysical tests of the geological environment were carried out for the purposes of the development of the Main Landslide Rehabilitation Project "Ratac". A geotechnical analysis of two variant solutions for the stabilization of an embankment affected by an active landslide was performed. Variant 1 includes the strengthening of the existing railway embankment with a curtain of piles (jet injected) Φ60 cm/1.5m, and Variant 2 includes the construction of three rows of bored piles diameter of 100 cm interconnected by a reinforced concrete cap at the toe of the railway embankment. Based on the data from the geological study, the geotechnical analyzes included: (i) stability calculations using the limit equilibrium method at critical sections and (ii) back-analysis for obtaining failure zone. Variant 2 was adopted for the rehabilitation of the "Ratac" landslide.