Sustainable Passive and Active Remedial Measures of Creeping Bedrock Slopes: Two Case Studies from Austria

Abstract.

Two case studies involving the large-scale and deep-seated creeping of slopes in southern Austria are discussed. In both instances passive and active remedial measures were applied to help mitigate the landslide hazard. At the first site, geodetic and extensometer measurements indicated movements averaging up to > 50 cm/year with a maximum of 352 cm occurring in one year. Previous active measures consisting of rigid structures were destroyed and replaced by flexible protective engineering works. The second case study involves an intensive geodetic monitoring program. Here, averaged yearly velocities are found up to > 30 cm/year. Active remedial measures consisted of stream diversion and protective engineering works. Both cases show the importance of a comprehensive passive remediation program.