CORRELATION BETWEEN UNIAXIAL COMPRESSIVE STRENGTH AND WATER CONTENT OF BEOČIN MARLS

Vladimir Čebašek; Veljko Rupar; Dragutin Jovković; Nikola Živanović

Vladimir Čebašek University of Belgrade - Faculty of Mining and Geology, Djusina 7, Belgrade, Serbia https://orcid.org/0000-0002-8667-2339
Veljko Rupar University of Belgrade - Faculty of Mining and Geology, Djusina 7, Belgrade, Serbia https://orcid.org/0000-0002-0296-8467
Dragutin Jovković University of Belgrade - Faculty of Mining and Geology, Djusina 7, Belgrade, Serbia https://orcid.org/0000-0001-7324-6034
Nikola Živanović University of Belgrade - Faculty of Forestry, Kneza Viseslava 1, Belgrade, Serbia https://orcid.org/0000-0003-0340-5516

Keywords: uniaxial compressive strength (UCS), water content, marls

Abstract

The uniaxial compressive strength (UCS) is one of the most important strength parameters for evaluating the mechanical behavior of rocks and is widely used as a fundamental input in rock mass characterization systems, empirical classifications, strength criteria, and various engineering design and calculation methods. Weak rocks, such as marls, exhibit a pronounced sensitivity to water content, which can significantly influence their strength and deformation characteristics. This paper investigates the correlation between water content and the reduction in UCS of marl samples. A series of laboratory tests were conducted on specimens with varying water contents. The results show a clear inverse relationship between water content and UCS, with strength decreasing progressively as water content increases. This reduction is attributed to the weakening of interparticle bonds, softening of the clay matrix, and increased pore water effects within the rock structure. The experimental data were analyzed to establish empirical relationships between water content and UCS reduction, providing a basis for predicting strength degradation under different environmental conditions. The findings highlight the critical role of water content in controlling the mechanical behavior of marls and emphasize the need to account for water content in geotechnical design and stability assessments in marl formations.

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