Mechanical and Engineering parameters of rocks used for site characteristics and mining engineers sometime becomes difficult to determine the required specific design parameters of rocks because of their discontinuous and specific design parameters. In these cases, empirical and analytical relationships among many physical and mechanical strength properties of materials are used to estimate the needed engineering properties of rocks and other brittle materials of interest. In this study, an attempt has been done to estimate the engineering properties of rocks using Ultrasonic Pulse Velocity (UPV) measurements and uniaxial compressive strength (UCS) tests on a large number of medium-hard and hard sandstone samples collected from Derince and Körfez districts of Kocaeli, Turkey. The engineering properties such as brittleness, hardness, fracture toughness and drillability index of sandstones have been determined. The test results indicated that there is a reasonably good correlation between UPV and UCS, and also UPV and engineering properties of sandstones.


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