The influence of foundation for the initiation and growth of the landslidein the carpathian flysch

The southern part of Poland is mostly covered by Carpathian mountains. Carpathian Flysch is especially predisposed for the landslides type of the subsoil. Around 98% of all occurring in the country landslides are located in Carpathians. Many of them became active in May 2010, when periodically dormant landslides and new landslide were activated after intensive rainfall. In addition to the main causes of landslides such as rainwater and its infiltration into the ground layers also the Carpathian Flysch tectonic construction (rock layers collapsing in one direction, with numerous jumps and discontinuity) and some anthropogenic influences (loading, slopes undercutting, improper dehydration, etc.) are typical triggering factors. Landslide activity contributes not only to a significant progress of the relief to which occur, but it also carries devastating consequences for the population living nearby. Landslides are a natural threat for economic activities and people’s lives. They are the cause of the damage not only residential buildings but also road and railways and other infrastructure. The landslide analysed here is located in Tymbark, Limanowa district. This article discusses the influence of the building foundation for initiation and growth of the landslide zone in the Carpathian Flysch. Two types of foundations are analysed – base plate foundation and a continuous footing. In both cases, there is a high risk to occur slip zones (FoS < 1.5). Base plate turns out to be more favorable foundation in this subgrade conditions. Although the displacements are relatively larger than in the other case, slip zone is located quite shallow. In the case of the continuous footing, landslide may form deeper reaching the bedrock.