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Correlation between PLT and Unaxial Compressive Strength for Eocene Flysch Layers

The Eocene flysch in the wider region of Split (Croatia) is characterized by the presence of thin-layers with frequent alternation of layer characteristics. Flysch layers are made of the following materials: marly clay, clayey marls, marls, calcareous marls, limestones and sandstones. The layers defined as soft rock are those from which it is very difficult to provide samples for testing uniaxial compressive strength. Since PLT can be used for irregular shaped samples testing, the connection between PLT and uniaxial compressive strength test results represent significant simplification in work with those materials. In this paper are shown the results of parallel testing of uniaxial compressive strength and PLT for the same samples. Correlations between these values are represented for groups of samples that have different carbonate content. Samples used for testing were ones with natural moisture. In the conclusion it is emphasized that correlation between PLT and uniaxial compressive strength published until this days has been defined for hard rocks and it can not been used for materials which are subject of this work. The samples are classificated in four groups according to carbonate content. The samples with the strength under the lower susceptibility limit of the used apparatus were excluded from testing.

Flych; Eocene; Uniaxial compreddive strenght; Point Load Index; Laboratory Test; Correlation

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