engleski

Stiffness Characterization of Karst Rock Mass

The paper describes determination of the deformation moduli of carbonate rocks in Croatian karst in order to predict deformation of geotechnical structures in a more reliable manner. Intensive measurements taken during geotechnical works conducted in carbonate rocks in Croatian karst have shown that measured deformations are significantly greater than that obtained in calculations that use deformability parameters in existing relations involving rock mass classifications. Furthermore, measured deformation shapes when compared to depth were evidently significantly different from deformations calculated or anticipated in the project. Research has shown that parameters affecting deformability of carbonate rocks in karst found in Croatia include the geological strength index (GSI), velocity of longitudinal waves (Vp) and the rock mass deformability index (IDm). The expression for determining rock mass stiffness is applicable in designing geotechnical structures that are built on karst found in Croatia. It can also be used for design work in other karst regions and other types of rock mass under the condition that it be adapted to the geological engineering features of such rock masses and that the geotechnical measurements on the carried out works be verified.

rock mass stiffness; karst

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