Zlatko Briševac

Current Cognition of Rock Tensile Strength Testing By Brazilian Test

During the early stages of the Middle Miocene transgression marine biota invaded the newly formed Paratethys Sea. Reefs and reef-like structures particularly flourished with life, supported by the favourable climate conditions. Miocene biogene buildups show a variety of fossil assemblages and lithologic features. The main reef-builders were bryozoans, coralline algae, corals, oysters, vermetids, sponges and serpulids. Water turbidity and depth were major ecological factors controlling the reef biota. Lithofacies types at the studied localities in Northern Croatia show significant similarity with the Upper Langhian (Middle Badenian) of the Leitha Mountains in Austria, but can also be well compared with Miocene to recent reef structures in the Mediterranean. The Miocene reef-like buildups exhibit different porosity rates and other lithological characteristics.

Models for estimating uniaxial compressive strength and elastic modulus

U ovom radu ukratko je izložen pregled najznacajnijih metoda za procjenu jednoosne tlacne cvrstoce i Youngovog modula elasticnosti intaktnog stijenskog materijala koje su nastale u okviru mnogobrojnih istraživanja. Iznesen je prijedlog podjele metoda prema kojemu se one u osnovi mogu podijeliti na jednostavne i složene metode. Jednostavne metode ukljucuju razlicite dijagrame i tablice te primjenu jednadžbi jednostruke regresije, dok u složene metode spadaju primjene jednadžbi visestruke regresije, modela neizrazite logike, neuronskih mreža, evolucijskog programiranja i regresijskog stabla.

Modeli za procjenu jednoosne tlačne čvrstoće i modula elastičnosti

U ovom radu ukratko je izložen pregled najznacajnijih metoda za procjenu jednoosne tlacne cvrstoce i Youngovog modula elasticnosti intaktnog stijenskog materijala koje su nastale u okviru mnogobrojnih istraživanja. Iznesen je prijedlog podjele metoda prema kojemu se one u osnovi mogu podijeliti na jednostavne i složene metode. Jednostavne metode ukljucuju razlicite dijagrame i tablice te primjenu jednadžbi jednostruke regresije, dok u složene metode spadaju primjene jednadžbi visestruke regresije, modela neizrazite logike, neuronskih mreža, evolucijskog programiranja i regresijskog stabla.

Estimation of uniaxial compressive and tensile strength of rock material from gypsum deposits in the area of Knin

In certain engineering tasks of preliminary nature there is a need for an estimation of important physical and mechanical properties such as uniaxial compressive and tensile strength. This paper analyzes the problems related to the assessment of uniaxial compressive and tensile strength of rock material in the deposit of gypsum in the Knin area. Its engineering characteristics strongly depend on the quantity of ground water and temperature and therefore it is difficult to conduct laboratory tests on this kind of material. The paper describes the comparison of estimates using equations published in the literature and equations that have been established on the basis of the research for the purpose of writing this paper.

ESTIMATION OF UNIAXIAL COMPRESSIVE AND TENSILE STRENGTH OF ROCK MATERIAL FROM GYPSUM DEPOSITS IN KNIN AREA

In certain engineering tasks of preliminary nature there is a need for an estimation of important physical and mechanical properties such as uniaxial compressive and tensile strength. This paper analyzes the problems related to the assessment of uniaxial compressive and tensile strength of rock material in the deposit of gypsum in the Knin area. Its engineering characteristics strongly depend on the quantity of ground water and temperature and therefore it is difficult to conduct laboratory tests on this kind of material. The paper describes the comparison of estimates using equations published in the literature and equations that have been established on the basis of the research for the purpose of writing this paper.

Procjena jednoosne tlačne i vlačne čvrstoće stijenskog materijala iz ležišta gipsa na području Knina

In certain engineering tasks of preliminary nature there is a need for an estimation of important physical and mechanical properties such as uniaxial compressive and tensile strength. This paper analyzes the problems related to the assessment of uniaxial compressive and tensile strength of rock material in the deposit of gypsum in the Knin area. Its engineering characteristics strongly depend on the quantity of ground water and temperature and therefore it is difficult to conduct laboratory tests on this kind of material. The paper describes the comparison of estimates using equations published in the literature and equations that have been established on the basis of the research for the purpose of writing this paper.

Models for estimating of uniaxial compressive strength and modulus of elasticity

U ovom radu ukratko je izložen pregled najznacajnijih metoda za procjenu jednoosne tlacne cvrstoce i Youngovog modula elasticnosti intaktnog stijenskog materijala koje su nastale u okviru mnogobrojnih istraživanja. Iznesen je prijedlog podjele metoda prema kojemu se one u osnovi mogu podijeliti na jednostavne i složene metode. Jednostavne metode ukljucuju razlicite dijagrame i tablice te primjenu jednadžbi jednostruke regresije, dok u složene metode spadaju primjene jednadžbi visestruke regresije, modela neizrazite logike, neuronskih mreža, evolucijskog programiranja i regresijskog stabla.