engleski

The influence of weathering process on geotechnical and mineralogical properties of fine grained lithological flysch components along the northern Adriatic coast of Croatia

Investigation results of the influence of weathering process on the geotechnical and mineralogical properties of fine grained lithological flysch components, such as siltstones, in the area of north Istria, Rječina river valley and Vinodol valley are presented in this paper. Physical and mechanical so as mineralogical properties of incompetent, fine grained flysch lithological members significantly change due to weathering. Landslide occurrences in flysch deposits are frequent and slip surface is formed at the contact of surficial deposits and flysch rock mass or inside the weathered flysch rock mass. Weathering effect on the residual shear strength values of fine grained lithological flysch components are investigated by laboratory tests on samples of different weathering grades in direct shear and ring shear apparatus. Uniaxial compressive strength and durability of fine grained lithological flysch rock mass samples with different weathering grades are also investigated. Mineralogical composition of the same fine grained lithological flysch components of different weathering grades is determined. Numerical simulations of the Valići landslide reactivation in the Rječina river valley are conducted with residual strength parameters of different weathering grades of fine grained lithological flysch components obtained in laboratory tests.

flysch, weathering, durability, landslide, residual shear strength, mineralogy, numerical modelling

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