engleski

An overview of geotechnical aspects of materials involved in slope instabilities along flysch-karst contact in Croatia

The narrowed flysch zone, in the area of central Istria and Kvarner hinterland, surrounded by carbonate rock mass (limestone, dolomitic limestone) is characterized by frequent landslides. Instabilities are caused by specific position of the flysch and carbonate rock mass, specific material properties, present geomorphological, chemical and physical processes which are influencing some physical, mechanical and hydraulic properties of involved materials. Sliding surface is mostly formed on the contact of the superficial deposits and impermeable flysch bedrock. In the zones of the chemically and physically weathered flysch rock mass, during longer and continuous rainy periods, pore pressures increase, due to which gradual loss of strength and eventual failure occurs. Many researches were carried out in the mentioned research area during landslide remediation works, doctoral thesis investigations and within different research projects. This paper provides an overview of basic geotechnical properties of materials present in different locations of the investigated area, which show significant dissipation in investigated values, but also some common material characteristics, crucial for instability occurrence.

flysch, material properties, instabilities, weathering

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