engleski

Remediation measures on a deep-seated slow- moving landslide

The Špičunak Landslide is a deep-seated slowmoving landslide causing damages on the pavement of the state road D3 near the Lokve settlement in the Gorski Kotar region, Croatia, during the last 50 years. The landslide was formed at the contact of Permian shales and Jurrasic limestone and dolomites. The length of the landslide is 70 m, the width is 85 m and the depth of sliding surface is 20 m. Due to deformations on the state and local road as well as on the embankment stone lining between them, it was necessary to perform remediation measures. Field investigations were executed as well as monitoring of displacement and ground water level. Based on the results of field investigations, the remedial measures were designed to stop further sliding and to increase general stability of the slope. The complex remedial measures design includes pile wall anchored in the head with pre-stressed geotechnical anchors positioned below the state road, concrete grid construction and self- drilling bolts on the embankment stone linings, in combination with bored and trench drains below the road construction and in the landslide foot. The stability back analysis as well as stability analysis for the designed remediation measures were carried out. Monitoring of the landslide during and after remediation using piezometers and inclinometers is also included in design. This paper presents the case study of the Špičunak Landslide, results of stability analysis and designed measures that will be used in landslide remediation planned to be conducted during the autumn 2019.

landslide, engineering geological investigations, stability analysis, remediation, pile wall, anchors, drainage, monitoring

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