ارتباط بین ویژگیهای سنگشناسی، فیزیکی و مکانیکی سنگ آهکهای سازند ای الم.

The frequency of limestone has caused to be encountered in different projects of engineering. The Ilam Formation is one of the formations that is widely spread in the Zagros Mountains, and in the sample cutting, it contains 195 meters of cream-colored limestone. Due to the extent of this formation, many projects have been performed on this formation, and they also encounter this formation in oil drilling. Its lower and upper Boundaries are continuous with Surgah Formation and Gurpi Formations, respectively. The aim of this study is to investigate and introduce the engineering geological features of Ilam formation limestones in the type section. The Ilam Formation is a challenge in various projects like other formations with carbonate units. Especially, when the mentioned units are different in terms of lithology, physical, and mechanical. In order to identify the characteristics and engineering behavior of these rocks, 60 blocks were selected from different limestone horizons of the Ilam Formation and were transferred to the laboratory. Then, the physical and mechanical properties and lithology characteristics of limestones are determined. The samples have been used to test the physical properties, durability, point load index, uniaxial compressive strength, Brazilian tensile strength, and wave velocity. The results of the multivariate regression showed that the differences between petrological and physical properties have led to a variation in their mechanical properties. Statistical indices such as R², R²adjusted, RMSE have been evaluated by Minitab 16 software, and the relationship between physical and mechanical properties was determined. Based on the results, there is a higher reliability coefficient for estimating mechanical properties than other properties in the dry condition compared to the saturated condition. The results of this research showed that lithological and physical characteristics play an important role in the mechanical properties of Ilam limestones. [ABSTRACT FROM AUTHOR]