The study of geotechnical properties of Qom formation sandstones and their using as borrow material (case study: Latgah village, northern Hamedan)

Sandstone outcrops of the Qom formation extend to a large part of northern Hamedan. This rocks are used as construction materials in Hamedan city. In this research, in order to identify the characteristics and engineering behavior of the sandstones, 15 rock blocks from Latgah (northern Hamedan) were selected. Lithological characteristics, physical and mechanical properties of these sandstones are determined. The samples were tested under the Schmidt hammer hardness test, durability, point load strength index, uniaxial compressive strength, Brazilian tensile strength and longitudinal wave velocity. The results of this study showed that the differences in the lithological and physical properties of sandstones have led to change in their mechanical properties. The relationship between physical and mechanical properties of sandstone has determined by regression analysis. Based on the obtained results, the mentioned rocks are suitable for use as Malone stone and building stone. The highest correlation between the uniaxial compressive strength (UCS) test with longitudinal wave velocity in dry and saturated state, were obtained that the determination coefficient (R2) are 0.93 and 0.91, respectively.